SPLIT PIN (P/N SP90K21) - New Surplus

The SP90K21 is a split pin (cotter pin) for safetying castellated nuts on drilled bolts in aircraft systems. This steel fastener provides positive mechanical locking by passing through aligned holes in a bolt and nut, then bending back the ends to prevent rotation. Commonly used on flight-control linkages, landing gear assemblies, and engine mounts where AN310 or AN320 castellated nuts require safetying.

Installation follows FAA AC 43.13-1B guidance: insert the pin through the drilled hole, bend both ends back at 90 degrees, and trim excess length to prevent snagging.

What is the SPLIT PIN (P/N SP90K21)?

The SP90K21 is a split pin (cotter pin) for safetying castellated nuts on drilled bolts in aircraft systems. This steel fastener provides positive mechanical locking by passing through aligned holes in a bolt and nut, then bending back the ends to prevent rotation.

Does the SP90K21 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The SPLIT PIN conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.

What material is the SP90K21 manufactured from?

Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the SP90K21.

Can I order the SP90K21 in custom quantities?

Yes, we sell hardware in various quantities from single units to bulk lots. The SPLIT PIN is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.