Introducing the range of RS PRO Cotter Pin Kits, a high-quality fastener solution for locking pins, nuts and bolts into place. Each fastener is made from steel with a zinc coating, making them much more cost-effective than their stainless-steel counterparts, while still offering a high level of protection against surface rust and oxidisation.

Cotter pins, also known as split pins, are used as a locking fastener used alongside bolts, pins and nuts to securely hold them in place when mechanical vibration over time can loosen them. The are designed to be inserted through the hole of a bolt or nut and then bent into different shapes that lock it in place and prevent the fastener from loosening. Split pins are most commonly used in:

• Automotive industry


• Marine and aerospace


• Industrial automation and manufacturing


• Engineering

As a rule, it is important not to re-use the split pin because the bending of the pin that locks it into place weakens the structure of it when it is re-bent and straightened to be re-used, which could lead to the pin failing.

RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards - they’re only given the RS PRO seal of approval if we’re confident of their exceptional quality, which means you can be confident too.