# Well nut
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{{Short description|Threaded fastener}}
thumb|upright=1.2|Three well nuts
A '''well nut''' is a [blind rivet](/source/blind_rivet)-like type of [fastener](/source/fastener) used to blindly fasten a piece (much like a [molly bolt](/source/molly_(fastener))) and to seal the bolt hole.
They are often referred to by the proprietary name '''Rawlnut''' or '''Rawl nut''', the name by which they are known in the UK.{{cn|date=February 2022}}
==Description==
A well nut consists of a flanged [neoprene](/source/neoprene) [bushing](/source/Bushing_(isolator)) with a [nut](/source/Nut_(hardware)) embedded in the non-flanged end. The bolt is passed through one of the pieces to be fastened and threaded onto the nut from the flanged end. The non-flanged end is then inserted through the other piece to be fastened. As the [bolt](/source/bolt_(fastener)) is tightened, [friction](/source/friction) from the neoprene flange against the piece being fastened prevents the nut from turning. The bushing is compressed by the nut, forming a lip behind the piece being fastened, which compresses the fastened piece and seals the bolt hole. It can also be used in a solid workpiece. As the bolt draws the embedded nut towards it, the walls of the well exert a force on the hole walls, anchoring it.[Smith, pp. 112–114.]
Well nuts are not particularly strong, but are useful for sealing holes and/or isolating vibrations.[Smith, p. 114.]
==History==
The well nut was originally developed by the [United Shoe Machinery Corporation](/source/United_Shoe_Machinery_Corporation) (USMC).