Linch pins (also called cotter pins or R-clips) in bulk packs of 50. The F-1 is a 4.5mm wire diameter linch pin in zinc-plated mild steel — the most commonly used size for securing implement mounting pins, linkage pins, and tow hitch pins on tractors, trailers, and agricultural equipment. The spring steel wire provides enough retention force to hold the pin in place under vibration and shock loads while remaining easy to remove by hand when needed.

Sized to suit standard 4.5mm pin holes. For assorted sizes in a single kit, see the F-40WK Linch Pin Assortment Kit. For the mounting pins themselves, see the Implement Mounting Pins and Hitch Pins listed separately.