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A split pin, also known as a cotter pin, or cotter key in the US, [1] is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.
Cross-section of a connecting rod, showing strap (S), gib (G), and cotter pin (C) Another view, with scale, of bicycle crank cotter. A cotter is a pin or wedge with a flat bearing surface passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning, [1] but in the U.S. it means a split pin.
There are two main types of clevis pins: threaded and unthreaded. Unthreaded clevis pins have a domed head at one end and a cross-hole at the other end. A cotter pin (US usage) or split pin is used to keep the clevis pin in place. Threaded clevis pins have a partially threaded shank on one end and a formed head on the other.
Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
A brass fastener, butterfly clips, brad, paper fastener or split pin is a stationery item used for securing multiple sheets of paper together. A patent of the fastener was issued in 1866 to George W McGill. [ 1 ]
The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats) is 1.75 times the major diameter. BA sizes are specified by the following British Standards: BS 57:1951 — B.A. screws, bolts and nuts
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D: Cross-section of a new split pin An R-clip , also known as an R-pin , R-key , hairpin cotter pin , [ 1 ] hairpin cotter , [ 2 ] bridge pin , [ 2 ] hitch pin clip [ 3 ] [ 4 ] or spring cotter pin , [ 5 ] is a fastener made of a durable but flexible material, commonly hardened metal wire, resembling the shape of the letter "R".