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.

250 Pcs Cotter Pins Kit - 304 Stainless Steel Cotter Pin Assortment Kit - 6 Sizes of Hardware Pins for Hitch Pin Lock System. Perfect Split pins for Mechanics, Lawn Mowers, & RV Owners

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Cotter pins, also called split pins, insert into holes in clevis pins, shafts, and other components to lock components in place. They feature a split-end design that inserts through the mounting surface, expands on the back side, and is folded back to prevent the pin from pulling out.

Metric DIN 94 Split Pins (Cotter Pins) are common used fasteners that hold assemblies together. Made of soft metal wire looped on itself so the two resulting tines can be inserted into a pre-drilled hole and bent to keep it in place.

Jul 2, 2023 · The primary purpose of split pins is to secure and retain other components in place, preventing them from unintentionally dislodging or coming apart. They are designed to withstand vibrations, jolts, and other forces while driving.

Split pins, often called split cotter pins, hairpin cotters, or R-clips, are actually a sub-type of cotter pin. Unlike basic cotter pins, which are used to secure components with a through-hole, such as nuts and bolts, split pins are mostly used to secure castle nuts and clevis pins. The two types of pins are also designed differently.

Split cotter pins, or cotter keys, create a secure lock in a clevis fastener system and through nuts and bolts with drilled holes for a cotter pin to be installed. Cotter pins are easy to use, requiring only a pair of pliers to install and uninstall.