Cotter Pins

Cotter Pins Assortment Kit

The Cotter Pins kit holds split pins (also called cotter pins) across the standard small-engine and machinery range - cheap, vital, never to hand when needed.

WHAT IS IN THE KIT

Typical 4-line cotter pin kits cover 1/16 to 5/32 inch diameter, lengths 3/4 to 2 inch, in stainless or zinc plated finish.

WHEN TO PICK THIS KIT

Pick a Cotter Pins kit for castle nuts, axle assemblies, hitch pins and any machinery joint where a positive locking pin is required.

RESTOCKING SINGLE SIZES

Larger cotter pins are stocked at our Pins & Clips range, where single sizes are stocked in bulk packs from 25 to 1000+ pieces.

FREQUENTLY ASKED QUESTIONS

What sizes are in a Cotter Pins Assortment Kit?

Typical 4-line cotter pin kits cover 1/16 to 5/32 inch diameter, lengths 3/4 to 2 inch, in stainless or zinc plated finish. Check the kit description on the specific product page for the exact piece count and size list - different kits in this category cover different size breadth at different piece counts.

What finish and class are the Cotter Pins in the kit?

Most Cotter Pins kits ship with the standard general-assembly finish and class noted in the kit description. For outdoor, wet or coastal use, look for the stainless variant where available. For structural and load-rated work, confirm the Class rating on the kit before installing. The full finish and class options for the individual items are listed on the Pins & Clips range page.

Can I buy single sizes from a Cotter Pins kit?

Yes. Every kit cross-references the matching main category for loose-stock purchase of single sizes. When one size depletes ahead of the others, restock from our Pins & Clips range where individual sizes are stocked in bulk packs from 25 to 1000+ pieces.

What materials are the cotter pins available in?

Standard Cotter Pins kits ship in zinc plated mild steel for general use. Stainless 304 cotter pins are available in specialty kits for outdoor and corrosion-prone applications. For high-temperature engine service, brass cotter pins are stocked loose in the Pins and Clips range.

How do I install a cotter pin?

Pass the cotter pin through the hole in the bolt or shaft. Bend the two legs in opposite directions (one up over the bolt, one down under the bolt) using cotter-pin pliers or general pliers. Don't reuse a cotter pin once bent - the metal fatigues and the pin can break in service.

What jobs is the Cotter Pins Assortment Kit best for?

Pick a Cotter Pins kit for castle nuts, axle assemblies, hitch pins and any machinery joint where a positive locking pin is required.

How do I identify which size in the kit I need?

Match the application part against the compartment labels on the kit case. For bolts and screws, measure the diameter at the thread (not the head) and the length under the head. For nuts, measure across the flats (AF) of the hex. See the identify your bolt or screw size walk-through for the full method.

Are Cotter Pins kits stocked in Australia?

Yes. The Cotter Pins kit range is stocked in our Brisbane warehouse and ships same business day on orders placed before 1pm AEST. 98.75% of orders ship same day from over 25,000 stock lines.

WHY AUSTRALIA TRUSTS BOLT & NUT

98.75% of orders ship the same business day from over 25,000 stock lines in our Brisbane warehouse. Read customer reviews on our reviews page or contact us for help selecting between kit sizes or working out the matched loose-stock restock.