Barrel threads

{{short description|Method to attach a weapon barrel and receiver}} In firearms, '''barrel threads''' refer to the screw threads used to attach a barrel.<ref>{{cite web | title=Silencer Saturday #389: Can You Thread Your Own Barrel? | date=19 July 2025 | url=https://www.thefirearmblog.com/blog/silencer-saturday-389-can-you-thread-your-own-barrel-44821963 }}</ref>

'''Action threads''', also called '''receiver threads''', are situated at the chamber end of the barrel, and can be used for attaching the barrel to the receiver. The receiver normally has corresponding threads which are internal, with the matching action threads on the barrel usually being external threads. This design is most commonly used in rifles and revolvers, but also on some pistols and shotguns. This method of fixing a barrel to a receiver has been used extensively by firearms manufacturers since before the 20th century,{{citation needed|date=July 2019}} and can be viewed as a traditional barrel mounting method. Action threads are not the only method of fixing a barrel to a receiver (see ''Alternative methods'' below). Furthermore, recoil-operated firearm designs have moving barrels (e.g. most pistols or the Barrett M82 rifle).

'''Muzzle threads''' are situated at the muzzle end of the barrel and can be used for mounting accessories such as a flash hider, suppressor or muzzle brake (compensator).

== Designation == There are many systems for designating thread types (metric, unified, Whitworth, etc.). Threading can be specified by diameter, pitch, angle, length and fit tolerances. However, the use of action threads is not well standardized within the firearms industry, and threading can vary between manufacturers and models.

For example, factory and aftermarket receivers using the Remington 700 footprint are produced with various types of action threads, all with a {{convert|1+1/16|in|mm|abbr=on|order=flip|sigfig=4}} diameter, but with a pitch of either a 1.588 mm (16 TPI, Remington standard), 1.411 mm (18 TPI) or 1.270 mm (20 TPI, Savage standard).<ref name=":3">[https://www.recoilweb.com/rem-700-custom-actions-109106.html Bolt Guns - a Survey of Rem 700 Custom Actions | RECOILWEB]</ref>

Typically, many rifles use thread diameters in the range between {{cvt|25|-|27|mm|in}}.{{citation needed|date=May 2020}} Many older rifles from the first half of the 20th century use a thread pitch around 2 mm (12.7 TPI), while many modern rifle use thread pitches around 1.5 mm (16.93 TPI). Fine threaded systems intended for hand tightening typically use thread pitches around 1 mm (25.4 TPI).{{citation needed|date=May 2020}}

== Mounting == Using action threads to mount a barrel to a receiver typically requires fitting by a competent gunsmith, and typically some machining has to be done.

In this process it is important to set the correct headspace.<ref>[https://www.brownells.com/userdocs/learn/Inst-173.pdf Brownells - Fitted Barrel Instructions]</ref> Correct mounting is important both for safety and accuracy.<ref>[https://www.warner-tool.com/custom-rifles/ Custom Rifles | Warner Tool Company]</ref> If the barrel, receiver and bolt are not fitted properly, severe and potential fatal problems can arise due to faulty headspace, e.g. cartridge overpressure and case rupture. Threaded barrels are often mounted to the receiver with a lot of torque, and will therefore generally require tools for assembly and disassembly, such as a suitable action wrench and a vise. Depending on the firearm, a recoil lug is sometimes fitted between the barrel and stock as part of the process,

Cleaning up the receiver and barrel action threads is often done during "blueprinting" in order to increase accuracy.<ref>[https://rifleshooter.com/2014/12/blueprinting-truing-a-remington-700-action/ “Blueprinting” (Truing) a Remington 700 Action – rifleshooter.com]</ref>

== Action threads ==

=== List of action threads === * M designates common V threads (like for instance metric threads) * Sq designates square threads * Tr designates trapezoidal threads * The shank length is not always the same at the thread length, which is the case if the insert has a threadless portion (sub-shank) * Tenon designates the thread length * Shoulder designates the barrel diameter in front of the thread portion * Unless otherwise mentioned, right hand threads are assumed. Left hand threads are designated "LH".

{| class="wikitable sortable" style="text-align: left;" |- ! Model ! Diameter (mm) ! Pitch (mm) ! Thread angle ! Shank length ! Comment ! Inch |- | Smith & Wesson J Frame | ''M12.70'' | 0.706 mm | 60° | | Also written as 0.500"-36 | 1/2"-36 |- | Smith & Wesson K Frame | ''M13.72'' | 0.706 mm | 60° | | Also written as 0.540"-36 | 69/128"-36 |- | Smith & Wesson L Frame, Colt J, V, Colt AA Mark III / King Cobra, Colt Python (new), Colt Trooper (J, V, AA) | ''M14.27'' | 0.706 mm | 60° | | Also written as 0.562"-36 | 9/16"-36 |- | Colt Python (old), Colt E & I | ''M14.31'' | 0.794 mm | 60° | | Also written as 0.5634"-32 | 9/16"-32 |- | Destroyer 1921 carbine (Spanish)<ref name="Bolt-deHaas-1995" /> | ''M15.88'' | 0.977 mm | 60° | 15.88 mm | 21.59 mm diameter at the shoulder | 5/8"-26 |- | Ruger GP-100 | ''M15.88'' | 1.058 mm | 60° | | | 5/8"-24 |- | Remington Rolling Block No. 4 Rem. Action (solid frame model)<ref name="MrSingleShotsGunsIdeaBook" />{{rp|33}} | ''M16.64'' | 1.588 mm | 90° | 16.89 mm | Also written as 0.655"-16. | 21/32"-16 |- | Mathieu<ref name="Bolt-deHaas-1995" /> | ''Tr16.76'' | 2.54 mm | 29° | 16.76 mm | Trapezoidal threads. Also written as 0.660"-20 | 85/128"-20 |- | Ruger Blackhawk | ''M16.97'' | 1.058 mm | 60° | | Also written as 0.668"-24 | 43/64"-24 |- | Smith & Wesson N Frame | ''M17.02'' | 0.706 mm | 60° | | Also written as 0.670"-36 | 43/64"-36 |- | Remington Rolling Block No. 4 Rem. Action (takedown model)<ref name="MrSingleShotsGunsIdeaBook" />{{rp|33}} | ''⌀17.15'' | (no threads) | N/A | 17.02 mm* | Also written as 0.675". ''*Of which a length of 5.56 mm of the shank has its diameter reduced to 15.62 mm.'' |27/40" |- | Ruger Single Six series | ''M17.26'' | 1.058 mm | 60° | | | 87/128"-24 |- | Colt Single Action Army Revolver (third gen)<ref name=":2">{{cite web |url=https://www.brownells.com/.aspx/lid=15873/GunTechdetail/Colt-SAA-First-Second-and-Third-Generation-barrel-thread-specification |title=Colt SAA First, Second and Third Generation barrel thread specification - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools - BROWNELLS |author= |date= |website= |publisher= |archive-url=https://web.archive.org/web/20140404225607/https://www.brownells.com/.aspx/lid=15873/GunTechdetail/Colt-SAA-First-Second-and-Third-Generation-barrel-thread-specification |access-date= |archive-date=2014-04-04 |quote=}}</ref> |''M17.35'' | 1.058 mm | 60° | 17.75 mm | Also written as 0.683"-24. Only 14.43 mm of the shank is threaded. | 87/128"-24 |- | Colt Single Action Army Revolver (first and second gen)<ref name=":2" /> | ''M17.65'' | 1.270 mm | 60° | 17.75 mm | Also written as 0.695"-20. Only 14.73 mm of the shank is threaded. | 89/128"-20 |- | M1917 revolver | ''M17.65'' | 1.270 mm | 60° | | Also written as 0.695"-20 | 89/128"-20 |- | Ruger Redhawk | ''M19.05'' | 1.270 mm | 60° | | | 3/4"-20 |- | Falling Block Works (FBW) Model K <ref name="MrSingleShotsGunsIdeaBook" />{{rp|68}} | ''M19.05'' | 1.588 mm | 60° | 25.15 mm | | 3/4"-16 |- | Stiller SPF 2500X<ref>{{Cite web |url=https://stilleractions.com/wp-content/uploads/2017/08/2500x_instruc.pdf |title=stilleractions.com - Instructions for using the SPF 2500X Actions |access-date=2021-04-21 |archive-date=2021-04-21 |archive-url=https://web.archive.org/web/20210421063321/https://stilleractions.com/wp-content/uploads/2017/08/2500x_instruc.pdf |url-status=dead }}</ref> | ''M19.05'' | 1.588 mm | 60° | | | 3/4"-16 |- | BSA Martini Cadet<ref>[https://www.flickr.com/photos/134395843@N08/29931070632/ BSA Martini Cadet 1 | Gunsmith Rod Henrickson]</ref><ref name="MrSingleShotsGunsIdeaBook" />{{rp|53}} | ''M19.05'' | 1.814 mm | 55° | 16.74 mm | Maximum 25.40 mm shoulder | 3/4"-14 |- | Marlin 336, 1895 (.45-70) | ''Sq19.69'' | 2.117 mm | 90° | 21.59 mm | Square threads | 0.775"-12 |- | Marlin 1895 (.450) | ''M19.69'' | 2.117 mm | 60° | 21.59 mm | | 0.775"-12 |- | Ruger Mini-14 | ''M20.64'' | 1.270 mm | 60° | | | 13/16"-20 |- | Colt AR-15 | ''M20.64'' | 1.588 mm | 60° | | The barrel nut thread is M31.75 x 1.411 mm (1-1/4"-18) | 13/16"-16 |- | HK416, HK MR223, HK MR556 | M21 | 1.5 mm | 60° | | The barrel nut thread is M32 x 1.5 mm (1.26"-16.93){{citation needed|date=April 2021}} | ''0.827"-16.93'' |- | Remington Rolling Block No. 2 Rem. Action<ref name="MrSingleShotsGunsIdeaBook" />{{rp|33}} | ''Sq21.59'' | 2.117 mm | 90° | 30.48 mm* | Square threads. Also written as 0.850"-12. ''*Of which a length of 10.16 mm of the shank has its diameter reduced to 20.45 mm'' |17/20"-12 |- | Remington Rolling Block No. 1-1/2 Rem., Sporting Action<ref name="MrSingleShotsGunsIdeaBook" />{{rp|33}} | ''Sq21.59'' | 2.117 mm | 90° | 36.65 mm* | Square threads. Also written as 0.850"-12. ''*Of which a length of 12.70 mm of the shank has its diameter reduced to 20.32 mm'' | 17/20"-12 |- | Remington 1867 Navy pistol | ''Sq21.59'' | 2.117 mm | 90° | | Square threads. Also written as 0.850"-12. | 17/20"-12 |- | Kimber M/84 | ''M21.43'' | 1.27 mm |60° | | | 27/32"-20 |- | Sako L46/L-46<ref name="Bolt-deHaas-1995" /> | ''M21.72'' | 1.588 mm | 60° | 21.46 mm | Also written as 0.855"-16. | 55/64"-16 |- | Howa 1500 Mini Action<ref name=":6">{{cite web |url=https://preferredbarrelblanks.com/pre-fit-gun-barrels/#prefit |title=Pre Fit Gun Barrels - Preferred Barrel Blanks, Inc. |author= |date= |website= |publisher= |access-date= |quote=}}</ref> | M22 | 1.5 mm | 60° | | | |- | Zastava M85 «Mini Mauser» | M22 | 1.5 mm | 60° | | | ''0.866"-16.93'' |- | Sako L461 | M22 | 1.6 mm{{citation needed|date=April 2021}} | 60° | 19.40 mm | | ''0.864"-15.87'' |- | Mossberg MVP .223<ref name=":6" /> | ''M22.23'' | 0.907 mm | 60° | | Also written as 0.875"-28. | 7/8"-28 |- | Weatherby Mark V Varmint, Weatherby Mark V Varmintmaster<ref name="Bolt-deHaas-1995" /> | ''M22.23'' | 1.411 mm | 60° | 16.99 mm | | 7/8"-18 |- | Cooper Model 22<ref>{{Cite web|url=https://www.flickr.com/photos/134395843@N08/33890200910|title=Cooper Model 22 Drawing|date=25 April 2017}}</ref> | ''M22.23'' | 1.588 mm | 60° | 16.26 mm | | 7/8"-16 |- | Savage Model 1920 | ''Sq22.86'' | 2.117 mm | 90° | | Square threads. Also written as 0.900"-12. | 29/32"-12 |- | Browning BPCR, 1885<ref>Single Shot Rifles and Actions (1969), Frank de Haas</ref> | ''M23.75'' | 1.270 mm | 60° | 23.37 mm | Also written as 0.935"-20. | 15/16"-20 |- | Winchester 1885<ref name="MrSingleShotsGunsIdeaBook" />{{rp|20}} | ''M23.75'' | 1.588 mm | 60° | 23.37 mm | | 15/16"-16 |- | Browning A-Bolt (early),<ref>[https://www.flickr.com/photos/134395843@N08/29416904974/ Browning A Bolt | Gunsmith Rod Henrickson]</ref> Browning BBR<ref name="OttesonVol2">{{cite book | last=Otteson | first=Stuart | title=The bolt action : a design analysis | publisher=Wolfe Pub. Co | publication-place=Prescott, Ariz. | date=1985 | isbn=0-935632-23-9 | oclc=12667054 | url = https://archive.org/stream/SOttesonTheBoltActionRifleVolII/S%20Otteson%20-%20The%20Bolt%20Action%20Rifle%20Vol%20II_djvu.txt}}</ref>, Remington 7600 | ''M23.81'' | 1.270 mm | 60° | | | 15/16"-20 |- | TAP-174, TAP-375 | M24 | 1.0 mm | 60° | 19.75±0.05 mm | 27.50 mm shoulder | ''0.945"-25.4'' |- | Sako AI/A1<ref name="silhouetten.org" /> (PPC, Vixen) | M24 | 1.5 mm | 60° | | | ''0.945"-16.93'' |- | Jalonen JJ-91<ref name="silhouetten.org" /> | M24 | 1.5 mm | 60° | | | ''0.945"-16.93'' |- | Keppeler<ref name="silhouetten.org" /> | M24 | 1.5 mm | 60° | 18 mm | | ''0.945"-16.93'' |- | Loppo 1,<ref name="silhouetten.org" /> Loppo 2<ref name="silhouetten.org" /> | M24 | 1.5 mm | 60° | 20 mm | | ''0.945"-16.93'' |- | Remington Rolling Block No. 1 Rem., Blackpowder Action<ref name="MrSingleShotsGunsIdeaBook" />{{rp|33}} | ''Sq24.77'' | 2.117 mm | 90° | 36.02 mm* | Square threads. Also written as 0.975"-12. ''*Of which a length of 10.62 mm of the shank has its diameter reduced to 23.37 mm'' | 39/40"-12 |- | Mosin-Nagant M91/30 | ''M24.64, M24.77'' ''M24.89'' | 1.588 mm, 1.588 mm, 1.814 mm | 55/60° | 23.88 mm | 30.02 mm shoulder. Thread angle varies. | ''0.970"-16'', ''0.975"-16,<ref>{{cite web |url=http://7.62x54r.net/MosinID/MosinSpec.htm |title=Mosin Nagant Rifle Specifications |author= |date= |website= |publisher= |access-date=2021-01-15 |quote= |archive-date=2020-11-12 |archive-url=https://web.archive.org/web/20201112011601/http://7.62x54r.net/MosinID/MosinSpec.htm |url-status=dead }}</ref> 0.980"-14<ref name="Bolt-deHaas-1995" />'' |- | MAS M-1936<ref name="Bolt-deHaas-1995" /> | ''M24.89'' | 1.588 mm | 60° | 21.46 mm | Also written as 0.980"-16. | 63/64"-16 |- | Husqvarna 1640, | ''M24.89'' | 2.117 mm | 55° | 18.16 mm | 27.94 mm shoulder. Also written as 0.979"-12. | 63/64"-12 |- | Mauser '''small ring''': Mauser G33/40,<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/30010695616/ Small Ring Mausers | Gunsmith Rod Henrickson]</ref> Model 93, 94, 95<ref name="Bolt-deHaas-1995" /> Swedish m/1896<ref name="Bolt-deHaas-1995" /> and m/1938<ref name=":0">{{cite web |url=https://www.brownells.com/userdocs/learn/Inst-173.pdf |title=Brownells Fitted Barrels Instructions - 21 MAR 2002 Inst-173 - Inst-173.pdf |author= |date= |website= |publisher= |access-date= |quote=}}</ref> | M25 | 2.117 mm | 55° | 18.16 mm / 16.38 mm / 15.88 mm / 16.2+0.2 mm | 24.89 mm major diameter. 27.94 mm shoulder | ''0.980"-12'',<ref name=":4" /> ''0.993"-12'' |- | Krag–Jørgensen, American model<ref name="Bolt-deHaas-1995" /> (US Krag-Jørgensen) | ''Tr24.89'' | 2.54 mm | 29° | 19.23 mm | Also written as 0.979"-10. Trapezoidal threads, 24.89 mm shoulder | 63/64"-10 |- | CZ 527, BRNO FOX | M25 | 1.25 mm | 60° | | Also written as 0.984"-20.32. | ''1.024"-20.32'' |- | Krico 500, 700, M600, M700 | M25 | 1.25 mm | 60° | 19.85-0.1 mm | 28.00-0.05 mm shoulder | ''0.984"-20.32'' |- | Krico M-600, Tradewind 600<ref name="Bolt-deHaas-1995" /> | M25 | 1.270 mm | 60° | 20.32 mm | 30.35 mm shoulder | ''0.985"-20'' |- | Lebel Berthier 8 mm<ref name="Bolt-deHaas-1995" /> | M25 | 1.411 mm | 55°/60° | 25.53 mm | 29.21 mm shoulder | ''0.985"-18'' |- | Varberger 717, 757, 777, Kongsberg Lakelander 389, Kongsberg 393 | M25 | 1.5 mm | 60° | 19.75±0.05 mm | 27.50 mm shoulder | ''0.984"-16.93'' |- | Heym SR 21, SR 30 | M25 | 1.5 mm | 60° | 29.98 mm | 29.25 mm shoulder, 5.90 mm loose recoil lug | ''0.984"-16.93'' |- | Nikko Model 7000,<ref name="OttesonVol2" /> Golden Eagle Model 7000<ref name="OttesonVol2" /> | M25 | 1.5 mm | 60° | | | 1"-16.03 |- | FR F1 | M25 | 1.5 mm | 60° | 22 mm | | |- | Sako L57 / L-57<ref name="Bolt-deHaas-1995" /> | M25 | 1.5 mm, 1.588 mm | 60° | 21.46 mm | | ''0.984"-16.93, 0.984"-16'' |- | Sako L-579,<ref name="Bolt-deHaas-1995" /> L579 Forester, L61 (early)<ref name="Bolt-deHaas-1995" /> | M25 | 1.588 mm | 60° | 22.10 mm | | 1"-16 |- | Mauser 8 mm (Siamese)<ref name="Bolt-deHaas-1995" /> | M25 | 1.814 mm | 55° | 13.08 mm | 27.94 mm shoulder | ''0.990"-14'' |- | Husqvarna 1600, 1900, 2000, 8000,<ref name="Bolt-deHaas-1995" /> Carl Gustaf 1900,<ref name="OttesonVol2" /> Carl Gustaf 2000 | M25 | 2.117 mm | 55° | 19.56 mm | 27.94 mm shoulder | ''0.984"-12'' |- | Mauser 89 (Belgian)<ref name="Bolt-deHaas-1995" /> | M25 | 2.117 mm | 55° | 19.3 mm | 28.32 mm shoulder | ''0.985"-12'' |- | Mauser 88 (German)<ref name="Bolt-deHaas-1995" /> | M25 | 2.117 mm | 55° | 18.29 mm | | ''0.986"-12'' |- | Mauser Brevex Magnum<ref name="Bolt-deHaas-1995" /> | M25 | 2.117 mm | 55° | 19.56 mm | | ''0.988"-12'' |- | Mauser 91 (Argentine)<ref name="Bolt-deHaas-1995" /> | M25 | 2.117 mm | 55° | 21.46 mm | 33.66 mm shoulder | ''0.986"-12'' |- | Mauser 71/84<ref name="Bolt-deHaas-1995">[https://archive.org/details/Bolt_Action_Rifles_3rd_Edition/page/n501/mode/2up "Bolt action rifles" (3rd edition 1995) by Frank de Haas, Part III: Reference - Barrel Shank Drawings, page 501-510]</ref> | M25 | 2.117 mm | 55° | 21.59 mm | 26.10 mm shoulder | ''0.987"-12'' |- | Farquharson rifle (Gibbs, Jeffery, and others) | ''M25.07'' | 1.814 mm | 55°/60° | 22.23 mm | Also written as 0.987"-14. Thread angle varies with production year and manufacturer | 1"-14 |- | Husqvarna RB shotgun, RB M67<ref name="Bolt-deHaas-1995" /> | ''M25.10'' | 2.117 mm | 55°/60° | 16 mm | | ''0.988"-12'' |- | Kongsberg M60 jakt, M83, M83S, M83SK | ''M25.23'' | 2.117 mm | 55° | 16.2+0.2 mm | Also written as 0.993"-12. Major diameter 25.23-0.2 mm. | 1"-12 |- | Krag–Jørgensen, Norwegian model<ref name="Bolt-deHaas-1995" /> | ''Tr25.30 '''LH''', Sq26.67 '''LH''''' | 2.117 mm | 90°/29° | 19.5+0.3 mm | 29+0.1 mm shoulder. '''Left hand threads'''. *Trapezoidal threads on Steyr manufactured actions, also written as 0.996"-12 LH.<ref>Karl Egil (1998). Norske Militærgeværer etter 1867, side 191</ref> *Square threads on Kongsberg manufactured actions, also written as 25.3-0.1 mm.<ref>Karl Egil (1998). Norske Militærgeværer etter 1867, side 132</ref> | ''1"-12 '''LH''', 1-1/16"-12 '''LH''''' |- | Browning A-Bolt (late) | ''M25.40'' | 0.794 mm | 60° | | | 1"-32 |- | Mossberg MVP .308, Mossberg 100ATR, Mossberg ATR Night Train, Mossberg 4x4 | ''M25.40'' | 1.270 mm | 60° | | | 1"-20 |- | Remington 788<ref>[https://www.flickr.com/photos/134395843@N08/29963465011/ Remington 788 | Gunsmith Rod Henrickson]</ref> | ''M25.40'' | 1.270 mm | 60° | 38.1 mm / 39.6 mm | | 1"-20 |- | Ruger No. 1,<ref name=":5" /> M77,<ref name="OttesonVol2" /><ref name=":5" /> M77 MkII<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/25183618355/ Ruger M77 Mark ll | Gunsmith Rod Henrickson]</ref> | ''M25.40'' | 1.588 mm | 60° | 17.53 mm | 35.56 mm shoulder | 1"-16 |- | Colt Light Rifle | ''M25.40'' | 1.588 mm | 60° | | | 1-16 |- | FN FAL<ref name=":4">{{cite web |url=http://www.improwis.com/notes/threads.webt |title=Common thread dimensions - Barrel & Receiver Threads |author= |date= |website= |publisher= |access-date= |quote=}}</ref> | ''M25.40'' | 1.588 mm | 60° | | | 1"-16 |- | Ruger American | ''M25.40'' | 1.588 mm | 60° | 26.8 mm | | 1"-16 |- | Ruger American Magnum | ''M25.40'' | 1.588 mm | 60° | 30.5 mm | | 1"-16 |- | Ruger Precision Rifle (RPR)<ref name=":5">{{cite web |url=https://columbiariverarms.com/bolt-action-prefits/ |title=Columbia River Arms - Bolt Action Prefits |author= |date=23 March 2018 |website= |publisher= |access-date= |quote= |archive-date=20 January 2021 |archive-url=https://web.archive.org/web/20210120104214/https://columbiariverarms.com/bolt-action-prefits/ |url-status=dead }}</ref> | ''M25.40'' | 1.588 mm | 60° | | Timing via barrel nut M31.75x1.411 mm (1-1/4"-18 TPI). | 1"-16 |- | Winchester Model 70 (post 64)<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/29419582494/ Winchester post 64 Model 70 | Gunsmith Rod Henrickson]</ref> | ''M25.40'' | 1.588 mm | 60° | 17.78 mm | | 1"-16 |- | Winchester 54/70 (pre 64)<ref name="Bolt-deHaas-1995" /> | ''M25.40'' | 1.588 mm | 60° | 18.8 mm | 29.08 mm shoulder | 1"-16 |- | Winchester 54/70 (.22 Hornet)<ref name="Bolt-deHaas-1995" /> | ''M25.40'' | 1.588 mm | 60° | 21.21 mm | 28.96 mm shoulder | 1"-16 |- | Tikka M55, M595, M695 | ''M25.40'' | 1.588 mm | 60° | | | 1"-16 |- | Tikka T3,<ref>[https://www.flickr.com/photos/134395843@N08/25026788465/ Tikka T3 | Gunsmith Rod Henrickson]</ref> T3X | ''M25.40'' | 1.588 mm | 60° | 22.10 mm | | 1"-16 |- | Sako L-61 (1. Mod.), Sako L61R Finnbear (early) | ''M25.40'' | 1.588 mm | 60° | | | 1"-16 |- | Sako 75 | ''M25.40'' | 1.588 mm | 60° | | | 1"-16 |- | Sako 85<ref>[https://www.flickr.com/photos/134395843@N08/29963497131/ Sako 85 | Gunsmith Rod Henrickson]</ref> | ''M25.40'' | 1.588 mm | 60° | | | 1"-16 |- |SIG Sauer CROSS | | | 60° | | | 1"-16 |- |Lee-Enfield (SMLE)<ref name="Bolt-deHaas-1995" /> | ''M25.40'' | 1.814 mm | 55°/60° | 17.46 mm<ref>{{cite book |last=Dunlap |first=Roy |author-link= |date=1950 |title=Gunsmithing |url= |location= |publisher= |page=  |isbn= }}</ref> | 25.32 mm major diameter. Most have a 60 grader thread angle, but some have 55°. A length of 2.54 mm of the shank at the chamber side in unthreaded with a diameter of 22.86 mm diameter. | 1"-14 |- | Homer Koon Omega III<ref name="OttesonVol2" /> | ''M25.40'' | 1.814 mm | 60° | | | 1"-14 |- | Champlin<ref name="Bolt-deHaas-1995" /> (1968, 1971)<ref name="OttesonVol2" /> | ''M25.40'' | 1.814 mm | 60° | 15.24 mm | | 1"-14 |- | Martini-Henry, Martini-Enfield,<ref name="MrSingleShotsGunsIdeaBook" />{{rp|63}} Metford | ''M25.40'' | 1.814 mm | 55°/60° | 17.78 mm | Thread angle depends on production date | 1"-14 |- |Falling Block Works (FBW) Model S <ref name="MrSingleShotsGunsIdeaBook" />{{rp|69}} | ''M25.40'' | 1.814 mm | 60° | 37.97 mm | | 1"-14 |- | Falling Block Works (FBW) Model H, J <ref name="MrSingleShotsGunsIdeaBook" />{{rp|71}} | ''M25.40'' | 1.814 mm | 60° | 25.15 mm | | 1"-14 |- | Ranger Arms Texas Magnum<ref name="OttesonVol2" /><ref name="Bolt-deHaas-1995" /> | ''M25.40'' | 1.814 mm | 60° | 25.15 mm | 29.21 mm shoulder | 1"-14 |- | Navy Arms Pedersoli Remington Rolling block<ref name="MrSingleShotsGunsIdeaBook" />{{rp|123}} | ''M25.40'' | 1.814 mm | 60° | 38.86 mm* | 30.5 mm shoulder. ''*The final part of the shank has its diameter reduced to 22.86 mm.'' | 1"-14 |- | M1 Garand, M14, M1A | ''Tr25.40'' | 2.540 mm | 29° | | ACME trapezoidal threads. 24.66 mm-0.13 mm major diameter, 23.19 mm- 0.13 mm minor diameter, 1.32 mm-0.08 mm average thread width. Internal radius of 0.25 mm, external radius of 0.13 mm. | 1"-10 (0.968"-10) |- | Sauer 202 Magnum | ⌀__mm | N/A | N/A | | Clamp coupling | |- | DPMS G2, Remington R10 | | |60° | | The barrel nut threads are M33.34 x 1.411 mm (1-5/16"-18) | |- | Armalite AR-10,<ref name="gundigest-ar-10" /> Eagle Arms AR-10, Noveske Rifleworks N6 | ''M25.40'' | 1.588 mm | 60° | | The barrel nut threads are M36.51 x 1.411 mm (1-{{frac|7|16}}-18, tolerance class 3A). | 1"-16 |- | DPMS LR-308<ref name="gundigest-ar-10">[https://gundigest.com/rifles/ar-15/understanding-the-ar-10-upper-receiver Understanding The AR-10 Upper Receiver | Gun Digest]</ref> S&W M&P 10, Bushmaster ORC, Remington R25, POF P-308*, (and most other AR308 / 308AR) | ''M25.40'' | 1.588 mm | 60° | | The barrel nut threads are M36.51 x 1.588 mm (1-7/16"-16, tolerance class 2A). ''*Tolerance class 2B'' | 1"-16 |- | Ithaca / Tikka LSA-55<ref name="Bolt-deHaas-1995" /> | ''M25.91'' | 1.588 mm | 60° | | | ''1.020"-16'' |- | HK417, MR308, MR762 | | 1.5 mm | 60° | | Barrel nut | ?-16.93 |- | Sauer 80, 90, 92, Carl Gustaf 3000, Colt Sauer<ref name="OttesonVol2" /> | M26 | 1.5 mm | 60° | | | ''1.024"-16.93'' |- | Howa 1500,<ref>[https://www.flickr.com/photos/134395843@N08/27230376204/ Howa 1500 | Gunsmith Rod Henrickson]</ref><ref>[https://rifleshooter.com/2017/11/building-a-custom-howa-1500-in-6-5-creedmoor/ Building a custom Howa 1500 in 6.5 Creedmoor – rifleshooter.com]</ref> S&W 1500, Mossberg 1500, Weatherby Vanguard | M26 | 1.5 mm | 60° | 17.91 mm | 3.8 mm depth countersink for the bolt head with a 17.9 mm diameter |''1.023"-16.93'' |- | Arisaka T99<ref name="Bolt-deHaas-1995" /> | M26 | 1.5 mm | 60° | 17.78 mm | 31.93 mm shoulder | ''1.024"-16.93'' |- | Remington 799 | M26 | 1.5 mm | 60° | | | ''1.020"-16.93'' |- | Arisaka T38, T44<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/50020001917/ Japanese Type 99, Japanese Type 38 & 44 | Gunsmith Rod Henrickson]</ref> | M26 | 1.75 mm | 60° | 18.29 mm | 28.58 mm shoulder | ''1.024"-14.51'' |- | Schultz & Larsen Model S4J,<ref name="OttesonVol2" /> Model 68DL<ref name="OttesonVol2" /> | M26 | 1.8 mm | 60° | | | ''1.024"-14.11'' |- | Steyr-Mannlicher M1895 | M26 | 1.814 mm | 60° | 17.60 mm | | ''1.023"-14'' |- | Springfield M1903 A3/ A4<ref name="Bolt-deHaas-1995" /> | ''Sq26.42'' | 2.540 mm | 29° | 18.64 mm | Square threads, 29.08 mm shoulder, 26.42 mm major diameter, 25.15 mm minor diameter, 1.30 mm + 0.05 mm average thread width. Also written as 1.040"-10. | 1-3/64"-10 |- | The Newton Rifle,<ref name="OttesonVol2" />{{clarification needed|date=April 2021}} Buffalo Newton 1924<ref name="OttesonVol2" /> | ''Sq26.42'' | 2.540 mm | 90° | | Square threads | ''1.040"-10'' |- | Sako L61/L-61 (late), Sako L61R Finnbear (late) | ''M26.59'' | 1.588 mm | 60° | 22.10 mm | Also written as 1.046"-16 | 1-3/64"-16 |- | Remington 700,<ref name=":3" /><ref name=":5" /> 721, 722, 725,<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/29752674070/ Remington 700 | Gunsmith Rod Henrickson]</ref><ref>[http://bulletin.accurateshooter.com/2012/06/dan-lilja-now-offers-pre-threaded-barrel-option-30-extra/ Dan Lilja Now Offers Pre-threaded Barrel Option ($30 Extra) « Daily Bulletin]</ref> XP-100, Defiant<ref name=":5" /> | ''M26.67'' | 1.588 mm | 60° | 22.48 mm | 30.35 mm shoulder. Also written as 1.050"-16. | 1-1/16-16 |- | Remington Rolling Block No. 1 M/1902, 7 mm Action<ref name="MrSingleShotsGunsIdeaBook">Mr. Single Shot's Gunsmithing Idea Book (1983) av Frank De Haas{{ISBN|0-8306-1511-3}}</ref>{{rp|33}} | ''Sq26.80'' | 2.117 mm | 90° | 36.32 mm* | Square threads. Also written as 1.055"-12. ''*Of which a length of 10.92 mm of the shank has its diameter reduced to 25.40 mm'' | 1-7/128"-12 |- | Remington 783<ref name=":6" /> | ''M26.80'' | 0.907 mm | 60° | | Also written as 1.055"-28 | 1-1/16"-28 |- | Savage Small shank<ref name="MidwaySavage">[https://www.midwayusa.com/how-to-guides/savage-rifle-info Savage Rifle Gun Parts Information - MidwayUSA]</ref><ref name=":5" /> (M110, M-110, M110 C, 112)<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/29420078383/ Savage 110 Series | Gunsmith Rod Henrickson]</ref> | ''M26.80'' | 1.270 mm | 60° | 42.06 mm | Also written as 1.055"-20 | 1-1/16"-20 |- | Nucleus,<ref name=":6" /> Mausingfield<ref name=":6" /> | ''M26.80'' | 1.270 mm | 60° | | Also written as 1.055"-20 | 1-1/16"-20 |- | BAT TR (serienr. over 100)<ref>[https://www.batmachine.com/wp-content/uploads/2018/03/tenon-1062TR.pdf BAT TR tenon thread profile (S/N over 100) - Bat Machine Co. Inc.]</ref> | ''M26.92'' | 1.411 mm | 60° | 23.37 mm | | 1-1/16"-18 |- | BAT Bumblebee, Vampire, Igniter<ref>[https://www.batmachine.com/wp-content/uploads/2020/10/tenon-1062BBVPIG.pdf BAT Bumblebee, Vampire & Igniter models tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M26.92'' | 1.411 mm | 60° | 19.61 mm | | 1-1/16"-18 |- | Krag–Jørgensen, Danish model<ref name="Bolt-deHaas-1995" /> | ''M26.92'' | 2.117 mm | 55°/60° | 27.43 mm | Conical threads | 1-1/16"-12 |- | Mannlicher–Schönauer (Greek)<ref name="Bolt-deHaas-1995" /> | ''M26.92'' | 2.117 mm | 60° | 18.47 mm | Also written as 1.059"-12. | 1-1/16"-12 |- | Kongsberg M48 rescue gun | ''M26.92'' | 2.117 mm | 55° | 18.03 mm | Also written as 1.059"-12. 29.85 mm shoulder diameter. | 1-1/16"-12 |- | Mauser FÉG 35M, G98/40 | ''M26.92'' | 2.117 mm | 55° | 18.03 mm | 29.85 mm shoulder | 1-1/16"-18 |- | Defiance Deviant<ref>[https://www.flickr.com/photos/134395843@N08/29753237840/ Defiance Deviant | Gunsmith Rod Henrickson]</ref> | ''M26.97'' | 1.588 mm | 60° | 24.26 mm | 3.8 mm depth countersink for the bolt head with a 17.9 mm diameter | 1-1/16"-16 |- | HS Precision 2000 Short Action<ref>[https://www.flickr.com/photos/134395843@N08/29417019454/ HS Precision 2000 | Gunsmith Rod Henrickson]</ref> | ''M26.97'' | 1.588 mm | 60° | | | 1-1/16"-16 |- | Surgeon 591 Short Action<ref>[https://www.flickr.com/photos/134395843@N08/29961149431/ Surgeon 951 | Gunsmith Rod Henrickson]</ref> | ''M26.97'' | 1.588 mm |60° |24.13 mm | 3.8 mm depth countersink for the bolt head with a 17.9 mm diameter | 1-1/16"-16 |- | Thompson/Center Icon<ref>[https://www.flickr.com/photos/134395843@N08/29418055753/ Thompson/Center Icon | Rod Henrickson]</ref> | ''M26.97'' | 1.588 mm | 60° | | | 1-1/16"-16 |- | Ultimatum Deadline Short Action | ''M26.99'' | 1.270 mm | 60° | | | 1-1/16"-20 |- | Kelbly Atlas<ref name="Atlas">[https://www.kelbly.com/actions-steel-atlas/ Custom Rifle Actions | The Atlas Action]</ref><ref name=":6" /> | ''M26.99'' | 1.411 mm | 60° | 17.58 mm | Also written as 1.061"-18 | 1-1/16"-18 |- | Kelbly Long Atlas<ref name="Atlas" /> | ''M26.99'' | 1.411 mm | 60° | 14.15 mm | | 1-1/16"-18 |- | BAT S, SV, B, DS, 3L, 3LL<ref>{{Cite web |url=https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1062.pdf |title=BAT S, SV, B, DS, 3L, 3LL models tenon thread profile - Bat Machine Co. Inc. |access-date=2021-04-21 |archive-date=2021-04-21 |archive-url=https://web.archive.org/web/20210421063329/https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1062.pdf |url-status=dead }}</ref> | ''M26.99'' | 1.411 mm | 60° | 26.7 mm | | 1-1/16"-18 |- | BAT SB, MB<ref>[https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1062SBMB.pdf BAT SB & MB models tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M26.99'' | 1.411 mm | 60° | 26.7 mm | The shoulder must have a radius | 1-1/16"-18 |- |Kelbly Atlas Short Action, Atlas Long Action<ref>{{cite web |url=https://www.kelbly.com/actions-steel-atlas |title=Custom Rifle Actions - The Atlas Action|author= |date= |website= |publisher= |access-date= |quote=}}</ref> | ''M26.99'' | 1.411 mm | 60° | 14.15 mm | | 1-1/16"-18 |- | BAT VR, BTA, TR (TR with serial number below 100)<ref>[https://www.batmachine.com/wp-content/uploads/2018/03/tenon-1062VR-A.pdf BAT VR, BRA, TR models tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M26.99'' | 1.411 mm | 60° | 17.68 mm / 19.61 mm | | 1-1/16"-18 |- | Stolle Panda Short Action<ref name=":1">{{cite web |url=https://www.kelbly.com/actions-aluminum-panda/ |title=Custom Rifle Actions - The Panda Action |author= |date= |website= |publisher=Kelbly Rifles |access-date=2021-01-15 |quote=}}</ref> | ''M26.99'' | 1.411 mm | 60° | 28.32 mm | 30 degree countersink for the bolt head | 1-1/16"-18 |- | Stolle Panda Long Action<ref name=":1" /> | ''M26.99'' | 1.411 mm | 60° | 24.89 mm | Straight bolt head | 1-1/16"-18 |- | Curtis Vector<ref>[http://www.curtiscustom.com/product/tennon-prints/ Tennon Prints - Curtis Custom]></ref> | ''M26.99'' | 1.588 mm | 60° | | | 1-1/16"-16 |- | Weatherby Mark V, Mark V Magnum<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/30013502656/ Weatherby Mark V | Gunsmith Rod Henrickson]</ref> | ''M26.99'' | 1.588 mm | 60° | 17.53 mm | | 1-1/16"-16 |- | Weatherby Mark V Magnum | ''M26.99'' | 1.588 mm | 60° | 17.78 mm | 29.21 mm shoulder | 1-1/16"-16 |- | Stiller Predator<ref>[https://www.flickr.com/photos/134395843@N08/30047170825/ Stiller Predator | Gunsmith Rod Henrickson]</ref> | ''M26.99'' | 1.588 mm | 60° | 25.15 mm | 3.8 mm depth countersink for the bolt head with a 17.9 mm diameter | 1-1/16"-16 |- | Sauer 200, 202, SIG Sauer 200 STR, 205, 3000, Carl Gustaf CG 4000 | ⌀27 mm | N/A | N/A | 36.5 mm | Clamp coupling.<ref>[https://s3-mittlag-prod.cmd.as/production/uploads/attachment/file/8234/Sauer-200-STR-presisjonsproblemer.pdf Sauer 200 STR - Presisjonsproblemer?]{{Dead link|date=May 2021 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> The clamping section is 36.5 mm long. The clamping portion of the 202 is somewhat shorter, such that 200 STR barrels can be used in the 202 without modifications (but not necessarily the other way around). | ''1.063"'' |- | Sauer 303 | ⌀__mm | N/A | N/A | | Clamp coupling. | |- | Sauer 404 | ⌀__mm | N/A | N/A | | Clamp coupling. | |- | Jalonen JJ-92A<ref name="silhouetten.org">[http://www.silhouetten.org/Technik/tab_zyl.htm Tabelle Zylinderverschlüsse]</ref> | M27 | 1.5 mm | 60° | | | ''1.062"-16.93'' |- | Sardec<ref name="silhouetten.org" /> | M27 | 1.5 mm | 60° | 25 mm | | ''1.062"-16.93'' |- | Sako TRG22, TRG-S, M995, Sako S20 | M27 | 1.5 mm | 60° | | | ''1.062"-16.93'' |- | Carcano M91<ref name="Bolt-deHaas-1995" /> | M27 | 1.75 mm | 60° | 27.05 mm | 28.83 mm shoulder. Also written as 0.968"-14. | ''1.062"-14.51'' |- | Accuracy International Short action AI (AT, AX308, AE, AW) | M27 | 2.0 mm | 60° | | Indexed via a set screw | ''1.063"-12.7'' |- |Steyr-Mannlicher M1895 |M27, ''M26.99'' | 2 mm, 2.117 mm | 60° | 24.38 mm | | ''1.063-12.7'', 1-1/16"-12 |- | Kongsberg M52 (jakt, redningsgevær), M55 jakt, M58 skarpskytter, M59 skarpskytter, M62 jakt, M63 selfangstgevær, M64 treningsgevær, M67 skarpskytter, M80 skarpskytter, M85E | M28 | 2.117 mm | 55° | 16.2+0.2 mm | 27.9 mm major diameter. Also written as 1.098"-12. | ''1.098"-12'' |- | Husqvarna 640 | M28 | 2.117 mm | 55° | 16.2+0.2 mm | | ''1.098"-12'' |- | Norinco Model 1887 | M28 | 0.977 mm | 60° | | Clone of Winchester Model 1887 | ''1.100"-26'' |- | Savage Bolt Action Shotgun | M28 | 1.270 mm | 60° | | | ''1.100"-20'' |- | Heym SR 10, SR 20, Mauser 2000, 3000<ref name="OttesonVol2" /> | M28 | 2.117 mm | 60° | | | ''1.100"-12'' |- | CZ BBK-02 | M28 | 2.117 mm | 60° | | | ''1.100"-12'' |- | Fabrique Nationale 222 Benchrest<ref name="Bolt-deHaas-1995" /> | M28 | 2.117 mm | 55°/60° | 15.9 mm | Built on Mauser 98 actions | ''1.100"-12'' |- | Zastava M70 / M98 | M28 | 2.117 mm | 55° | | | ''1.100"-12'' |- | Voere Shikar,<ref name="OttesonVol2" /> K-14<ref name="OttesonVol2" /> | M28 | 2.117 mm | 60° | | | ''1.100"-12'' |- | Mauser '''large ring''':<ref name="Bolt-deHaas-1995" /><ref>[https://www.flickr.com/photos/134395843@N08/29933092232/ Large Ring 98 Mauser | Gunsmith Rod Henrickson]</ref> Mauser K98k, M98,<ref name=":0" /><ref name=":5" /> Mauser Model 24 (Yugoslavian)<ref name="Bolt-deHaas-1995" /> Interarms Mark X<ref name=":0" /> | M28 | 2.117 mm | 55° / 60° | 16.2+0.2 mm / 15.88 mm | Major diameter 27.90-0.10 mm | ''1.100"-12<ref name=":4" />'' |- | CZ 550, 557, 602 | M28 | 2.0 mm | 60° | | | ''1.102"-12.7'' |- | Kongsberg Rolling Block (RB) M/1867 | M28 | | 55° | | | |- | Kongsberg RB shotgun | Tr | | 29° | | Trapezoidal threads | |- | Jarmann M/1884 | | | 55°/60° | | | |- | Savage Large Shank<ref name="MidwaySavage" /><ref name="OttesonVol2" /><ref name=":5" /> | ''M28.58'' | 1.270 mm | 60° | | Also written as 1.120"-20 | 1-1/8"-20 |- | Savage 110 (short magnum),<ref name="Bolt-deHaas-1995" /> Ultimatum Deadline Long Action | ''M28.58'' | 1.270 mm | 60° | | | 1-1/8"-20 |- | Tubb 2000, Tubb ATR | ''M28.58'' | 1.411 mm | 60° | | Barrel coupler is 1-3/4"-18<ref>[http://www.davidtubb.com/index.php?route=account/download/free&download_id=40 Tubb Adaptive Target Rifle Press Release]</ref> | 1-1/8"-18 |- | Armalite AR-30 | ''M28.58'' | 1.411 mm | 60° | | UNEF, tolerance class 3A | 1-1/8"-18 |- | BAT M<ref>[https://www.batmachine.com/wp-content/uploads/2014/08/tenon-1125-B.pdf BAT M model tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M28.58'' | 1.588 mm | 60° | 26.67 mm | | 1-1/8"-16 |- | BAT HR, BTLA<ref>[https://www.batmachine.com/wp-content/uploads/2019/09/tenon-1125HR-C.pdf BAT HR & BTLA models tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M28.58'' | 1.588 mm | 60° | 17.30 mm / 19.25 mm | | 1-1/8"-16 |- | Herters (BSA) U-9<ref name="Bolt-deHaas-1995" /> | ''M28.32'' | 2.117 mm | 55° | 23.37 mm | 31.37 mm shoulder. Also written as 1.115"-12. | 1-1/8"-12 |- |Falling Block Works (FBW) Model L Express <ref name="MrSingleShotsGunsIdeaBook" />{{rp|72}} | ''M28.58'' | 2.117 mm | 60° | 25.15 mm | | 1-1/8"-12 |- | Enfield P-14 | ''Tr28.58'' | 2.54 mm | 29° | 18.29 mm | Trapezoidal threads, 33.66 mm shoulder | 1-1/8"-10 |- | Enfield 1917<ref name="Bolt-deHaas-1995" /> | ''Tr28.58'' | 2.54 mm | 29° | 20.32 mm | Trapezoidal threads, 33.66 mm shoulder | 1-1/8"-10 |- | Enfield P-14, M1917<ref name="Bolt-deHaas-1995" /> | ''Sq28.58'' | 2.54 mm | 90° | | Square threads | 1-1/8"-10 |- | Remington 30, 30S, 720<ref name="Bolt-deHaas-1995" /> | ''M28.58'' | 2.54 mm | 60° | 18.29 mm | 33.66 mm shoulder | 1-1/8"-10 |- | Accuracy International Long action magnum AI (AXMC, AX338) | M30 | 2.0 mm | 60° | | Indexing via set screw | ''1.181"-12.7'' |- | BAT CT<ref>[https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1187-B.pdf BAT CT model tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M30.16'' | 1.588 mm | 60° | 26.42 mm | | 1-3/16"-16 |- | BAT L<ref>[https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1250.pdf BAT L model tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M31.75'' | 1.588 mm | 60° | 44.2 mm | | 1-1/4"-16 |- | BAT EX with CHEY-TAC breechface<ref>[https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1500CT.pdf BAT EX with Chey-Tac tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M38.10'' | 1.588 mm | 60° | 37.34 mm | | 1-1/2"-16 |- | BAT EX with 50 BMG breechface<ref>[https://www.batmachine.com/wp-content/uploads/2014/06/tenon-1500.pdf BAT EX with 50 BMG models tenon thread profile - Bat Machine Co. Inc.]</ref> | ''M38.10'' | 1.588 mm | 60° | 34.80 mm | | 1-1/2"-16 |- |}

=== Alternative methods === Several alternative mounting methods to using action threads exist.

;Barrel press fit: Pressing the barrel into the receiver to achieve a press fit is an alternative to using action threads which has been used on firearms such as Anschütz Fortner, Anschütz Model 54,<ref>[http://bulletin.accurateshooter.com/2013/01/upgrading-an-older-model-54-anschutz-recommended-smiths/ Upgrading an Older Model 54 Anschütz — Recommended Smiths « Daily Bulletin]</ref> AKM<ref>{{Cite web|url=https://www.brownells.com/.aspx/lid=16778/GunTechdetail/Building-An-AK-74-Part-4-Pressing-In-The-Barrel|title = Building an AK-74 Part 4: Pressing in the Barrel | Top Rated Supplier of Firearm Reloading Equipment, Supplies, and Tools - Colt | date=24 April 2019 }}</ref> and Sauer 101.<ref>[https://www.sporting-rifle.com/reviews/sauer-101-review/ Sauer 101 Review | Sporting Rifle magazine] {{Webarchive|url=https://web.archive.org/web/20190703083739/https://www.sporting-rifle.com/reviews/sauer-101-review/ |date=2019-07-03 }} "This rifle is not a switch barrel, like its predecessor, but fixed. Sauer opted for a non-threaded, heat shrunk, barrel to receiver fitting"</ref><ref>[http://bulletin.accurateshooter.com/2013/03/new-sauer-101-hunting-rifle-from-j-p-sauer-sohn/ New Sauer 101 Hunting Rifle from J.P. Sauer & Sohn « Daily Bulletin] "Sauer boasts that the barrel is heat-pressed into the receiver, with the bolt locking up directly into the barrel"</ref>

;Barrel nut: Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15.

;Hand tools: Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8. These methods typically only require simple hand tools (like a hex key) or no tools at all. This can be a great advantage to competition shooters who regularly wear out barrels, or for hunters who want a modular rifle that can shoot several calibers. In these designs, the bolt locks directly into the barrel, and the manufacturer often guarantees that the barrel is headspaced correctly from the factory.

<gallery> File:Charter Arms Explorer II takedown.jpg|A quick change barrel system using threads, intended to be assembled and disassembled without tools. </gallery>

== Muzzle threads == [[File:Muzzle brake (disassembled) for .358-378 RG.jpg|thumb|right|Gun with threaded muzzle besides a disassembled muzzle brake and thread protector.]] Muzzle threads is one method of fitting accessories such as flash hiders, suppressors or muzzle brakes (compensators). The applicable thread is limited to a certain degree by the bullet caliber and barrel diameter. Right-hand threads (RH) are most common, but left-hand threads (LH) are sometimes used instead. Unless otherwise stated, right-hand threads are usually assumed.

In Europe it has become common to use 1 mm muzzle thread pitches.<ref>[https://www.danishguntech.dk/suppressors/muzzle-threading/ Muzzle threading - Danish Guntech ApS]</ref> M14x1 is a common thread type on European hunting barrels, while M18x1 is common on competition bull barrels. A larger barrel thread diameter can improve the precision of the barrel.<ref>{{cite web |url=http://bulletin.accurateshooter.com/2015/04/muzzle-threading-dont-remove-too-much-steel/ |title=Muzzle Threading — Don't Remove Too Much Steel |department=Daily Bulletin |date=2021-01-15 |website=Accurate Shooter}}</ref> As of 2021, various Unified threads are still the de facto standard on most American firearms, such as 1/2"-28 (M12.7x0.907) on 5.6 mm (.223") caliber rifles and 5/8"-24 (M15.88x1.058) on 7.62 mm (.308") calibers.

Some common barrel threads are listed below:<ref>[https://www.infiniteproductsolutions.com/thread-guide/ Thread Reference Guide - Infinite Product Solutions]</ref><ref>[https://www.capitolarmory.com/support/common-thread-pitches.html/ Common Thread Pitches - Capitol Armory]</ref><ref>[https://www.silencershop.com/blog/post/common-barrel-thread-reference Common Barrel Thread References]</ref><ref>{{Cite web |url=https://ruggedsuppressors.com/wp-content/uploads/2018/03/Thread-Pitch-Guide.pdf |title=Thread Pitch Guide - Thread-Pitch-Guide.pdf |access-date=2021-04-21 |archive-date=2021-04-21 |archive-url=https://web.archive.org/web/20210421064342/https://ruggedsuppressors.com/wp-content/uploads/2018/03/Thread-Pitch-Guide.pdf |url-status=dead }}</ref>

{| class="wikitable sortable" style="text-align: left;" |+ Common muzzle threads |- ! Diameter ! Pitch ! Comment ! Inch |- | M12.7 | 0.907 mm | Common on American rifles and pistols chambered for .223 Rem, .22 LR and 9×19mm. | 1/2"-28 |- | M12.7 | 1.270 mm | Common on older European rifles chambered for .22 LR. | 1/2"-20 |- | M13.5 | 1 mm '''LH''' | Some European 9×19mm pistols | 69/128"-25.4 '''LH''' |- | M14 | 1 mm | Very common on European hunting rifles. Also used on some airsoft guns (although often in the left-hand version). | 71/128"-25.4 |- | M15.88 | 1.058 mm | Very common on American rifles chambered for the 7.62 caliber (for example .300 BLK, 7.62x39 mm, .308 Win) | 5/8"-24 |- | M18 | 1 mm | Common on European rifles with bull barrels. | 45/64"-25.4 |- |}

{| class="wikitable sortable" style="text-align: left;" |+ Less common muzzle threads |- ! Diameter ! Pitch ! Comment ! Inch |- | M8 | 0.75 mm | Some .22 LR pistols | 20/64"-33.87 |- | M9.53 | 1.058 mm | Some .22 LR pistols | 3/8-24 |- | M12.7 | 0.706 mm | Some 9 mm rifles | 1/2"-36 |- | M13 | 1 mm | Older Glock 9×19mm, Galil (5.56 and 7.62 mm) | 33/64"-25.4 |- | M13 | 1 mm '''LH''' | Steyr AUG | 33/64"-25.4 '''LH''' |- | M14 | 1 mm '''LH''' | AK-47 and AKM. Also common on airsoft guns. | 71/128"-25.4 '''LH''' |- | M14.29 | 1.058 mm | Some .40"/10 mm pistols. Used on some rifles in .223", 6.5 mm, .308", and 9×19mm. | 9/16-24 |- | M14.29 | 1.058 mm '''LH''' | FN FAL | 9/16-24 '''LH''' |- | M14.68 | 0.907 mm | Some pistols in .45-kaliber. Also written as .578"-28. | 74/128"-28 |- | M15 | 1 mm | Some German rifles. | 38/64"-25.4 |- | M16 | 1 mm | .45 caliber pistols from HK. | 20/32"-25.4 |- | M16 | 1 mm '''LH''' | .45 caliber pistols from HK. | 20/32"-25.4 '''LH''' |- | M17.46 | 1.058 mm | Some American 7.62 mm bull barrels, as well as some barrels for .450 Bushmaster (11 mm caliber). | 11/16-24 |- | M18 | 1.5 mm | Accuracy International .338 LM. | 45/64"-16.93 |- | M22 | 0.75 mm | Saiga 12 gauge shotgun | 111/128"-33.87 |- | M22.23 | 1.814 mm | Some rifles in 12.7 mm caliber | 7/8"-14 |- | M24 | 1 mm | Accuracy International 12.7 mm, Micro Uzi, Uzi pistol | 121/128"-25.4 |- | M24 | 1.5 mm | AK-74 (5.45x39 mm) | 121/128"-16.93 |- | M25 | 1 mm | Desert Tech 12.7 | 63/64"-25.4 |- | M25.4 | 1.814 mm | Some rifles in 12.7 mm caliber. | 1"-14 |- | M26 | 1.5 mm | Zastava M85 and M92 (7.62x39 mm), Uzi, Mini Uzi. | 1-3/128"-16.93 |- |}

== External threads on muzzle accessories == [[File:Zastava-M76-Screw-Silencer.jpg|thumb|right|Flash hider with external threads for a suppressor on a Zastava M76.]] Some accessories, notably suppressors and concussion reduction devices (CRDs), attach via a muzzle device such as a flash hider, compensator, thread protector or sleeve.

{| class="wikitable sortable" style="text-align: left;" |+ External threads on muzzle accessories |- ! Diameter ! Pitch ! Comment ! Inch |- | M19 | 1.588 mm | Oil filters on Ford, Dodge og Jeep | 3/4"-16 |- | ''M20'' | ''2.5 mm'' | ''Standard metric coarse thread'' | 101/128"-10.16 |- | M20.6 | 1.588 mm | Flash hiders from Kineti-Tech. Oil filters from Chevy and GM. | 13/16"-16 |- | M20.6 | 1.814 mm | Standard pipe thread (NPT). | 3/4"-14 |- | M22.9 | 1.058 mm | Q Cherry | .900"-24 |- | ''M24'' | ''3 mm'' | ''Standard metric coarse thread'' | 121/128"-8.47 |- | M27 | 1.5 mm | Ase Utra Borelock, Klärig Engineering BL2, Uronen Precision | 1-1/16"-25.4 |- | M28.6 | 2.117 mm | Flash hiders from Cyclone, Angel and Demon, some from SilcencerCo, BattleComp | 1-1/8"-12 |- | ''M30'' | ''3.5 mm'' | ''Standard metric coarse thread'' | 1-3/16"-7.26 |- | M34.9 | 0.907 mm | Quietbore Quickie | 1-3/8"-28 |- | M34.9 | 1.058 mm | Some suppressor tubes from SilencerCo, Dead Air, Griffin Armament, ODIN Works, Q LLC, Torrent Suppressors, Area 419, Energetic Armament, YHM, SDTA, Super Precision Concepts, Plan B, Enfield Rifle Company, Rex Silentium, JK Armament, Ronin Factory, JMAC Customs, Enduro, ASR, Aklys Defense.<ref>{{cite web |author=Dave Merrill |date=January 22, 2020 |url=https://www.recoilweb.com/the-universal-silencer-standard-1-375x24-156634.html |title=Universal Silencer Standard: HUB 1.375x24 TPI |website=Recoil}}</ref> |1-3/8"-24 |- | ''M36'' | ''4 mm'' | ''Standard metric coarse thread'' | 1-27/64"-6.35 |- | M36.5 | 1.270 mm | Suppressor tubes from SDTAC, Diversified Machine, Super Precision Concepts. Maglite D Cell. | 1-7/16"-20 |- | M36.5 | 1.058 mm | Some Diversified Machine suppressors | 1-7/16"-24 |- | M38.9 | 1.058 mm | Some Diversified Machine suppressors | 1-17/32"-24 |- | ''M42'' | ''4.5 mm'' | ''Standard metric coarse thread'' | 1-21/32"-5.64 |- | M42.5 | 1.058 mm | Some Diversified Machine suppressors | 1-43/64"-24 |- |- |}

== References == <references/>

== External links == * [https://www.youtube.com/watch?v=zZH8w4Czy9o Video of professional rifle barrel threading (YouTube)] * [https://www.youtube.com/watch?v=BVAK6gPqLvU Video of chasing out receiver threads on a Mauser 98 (YouTube)] * [https://web.archive.org/web/20210318073814/http://www.homegunsmith.com/cgi-bin/ib3/iB_html/uploads/post-3-41015-BSD_small.pdf TS TJ Barrel Shanks, Barrel Shank Drawings]

Category:Firearm terminology