MS24665-138 Cotter Pin is a military standard aircraft fastening component designed to provide positive mechanical locking for castellated nuts, clevis pins, bolts, and other drilled fasteners used in critical aerospace applications. This package contains 100 cadmium-plated cotter pins suitable for aircraft maintenance, repair, overhaul, and OEM manufacturing.

Manufactured in accordance with the MS24665 specification, this cotter pin features a nominal 1/16 in. diameter and 1-1/4 in. overall length. The steel construction is protected by a durable cadmium-plated finish, providing excellent corrosion resistance while maintaining the strength and flexibility required for dependable installation and long service life in demanding aviation environments.

Installed through the pre-drilled hole of a compatible fastener, the legs are bent in opposite directions to create a secure mechanical lock that prevents loosening caused by vibration, cyclic loading, and operational movement. MS24665 series cotter pins are widely used throughout aircraft landing gear, flight control systems, engine installations, hydraulic components, and structural assemblies where reliable fastener retention is essential.

As with standard aviation maintenance practices, cotter pins should be replaced whenever removed to ensure continued locking effectiveness and maintain the integrity and safety of the secured assembly.

Key Features

- Part Number: MS24665-138
- Manufacturer: Military Standard (MS) / Approved Aviation Hardware Manufacturer
- Component: Cotter Pin (Split Pin)
- Material: Cadmium-plated steel
- Nominal Size: 1/16 in. diameter × 1-1/4 in. length
- Function: Secondary mechanical locking device for castellated nuts, clevis pins, and drilled fasteners
- Finish: Corrosion-resistant cadmium plating
- Pack Quantity: 100 pieces
- Suitable for aircraft structural, landing gear, engine, hydraulic, and flight control applications requiring secure fastener retention