Cotter Keys | McMaster-Carr

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System of Measurement

Diameter

Cotter Pin Type

Length

Material

Stainless Steel

Wire Diameter

Clevis Pin Diameter

Pin Type

Finish

Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

Eye Diameter

Performance

Corrosion Resistant

Usable Length

Specifications Met

Shaft Diameter

RoHS

Compliant with Exemptions

REACH

DFARS Specialty Metals

OD

Export Control Classification Number (ECCN)

End Type

Spring-Loaded Ball

ID

Passivation

Number of Pieces

Thickness

Retainer Clearance

Military Specification

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1,078 Products

Cotter Pins

Cotter Pins

Bend the prongs to secure the ends of clevis pins and shafts

Mil. Spec. Cotter Pins

Mil. Spec. Cotter Pins

Manufactured and tested to strict U.S. military standards

Hairpin Cotter Pins

Hairpin Cotter Pins

Push into a hole for simple one-step installation

Long-Life Hairpin Cotter Pins

Long-Life Hairpin Cotter Pins

Maintain tension for repeated use and install with a simple push

Wire-Snap Cotter Pins

Wire-Snap Cotter Pins

Quick to open and close for parts you need to disassemble frequently

Long-Life Wire-Snap Cotter Pins

Long-Life Wire-Snap Cotter Pins

Maintain tension for repeated use with parts you need to disassemble frequently

Wraparound Cotter Pins

Wraparound Cotter Pins

The most vibration-resistant reusable pins we offer

Hammer-Set Cotter Pins

Hammer-Set Cotter Pins

Unlike standard cotter pins, you only need access to one side to install

Strong-Hold Hammer-Set Cotter Pins

Strong-Hold Hammer-Set Cotter Pins

A wedge keeps pins in place, even under extreme stress and vibration

Bow-Tie Cotter Pins

Bow-Tie Cotter Pins

The most versatile to install—push or pull into either side of a hole

Coiled Cotter Pins

Coiled Cotter Pins

Free of sharp ends that can snag and cut surrounding material

Hairpin Clips

Snap into a groove instead of inserting through a hole

Cotter Pin Assortments

Cotter Pin Assortments

Bend the prongs to secure clevis pins and shafts with a variety of hole sizes

Hairpin Cotter Pin Assortments

Hairpin Cotter Pin Assortments

A range of sizes that push into a hole for simple one-step installation

Hairpin Clip Assortments

Hairpin Clip Assortments

A variety of sizes that snap into a groove instead of inserting through a hole

Other Products

Linch Pins

Slide into holes on clevis pins and shafts and snap down the locking ring so parts won’t fall off

Split Rings

Secure clevis pins, connect components, or add a pull handle; also known as key rings

Quick-Release Pins

Quick-Release Pins

Fasten or remove components on equipment with a spring-loaded retaining ball

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)