STIFFNUT (P/N a126a77) - New Surplus

The a126a77 is an all-metal self-locking stiffnut designed to maintain prevailing torque under vibration in aircraft applications. This all-metal stop nut uses internal locking features rather than polymer inserts, making it suitable for high-temperature engine bay and structural attachments where thermal conditions preclude nylon-insert designs. Compatible with AN363/MS21045 aerospace standards, it prevents fastener loosening during flight operations and maintenance cycles.

Installation requires torque to specification per aircraft maintenance manual, with reuse limits determined by inspection and manufacturer guidance. Verify part compatibility with your aircraft's Illustrated Parts Catalog before installation.

What is the STIFFNUT (P/N a126a77)?

The a126a77 is an all-metal self-locking stiffnut designed to maintain prevailing torque under vibration in aircraft applications. This all-metal stop nut uses internal locking features rather than polymer inserts, making it suitable for high-temperature engine bay and structural attachments where thermal conditions preclude nylon-insert designs.

Does the a126a77 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The STIFFNUT 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 a126a77 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 a126a77.

Can I order the a126a77 in custom quantities?

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