STIFFNUT (P/N a125b77) - New Surplus
P/N: a125b77
Category: Fasteners & Hardware
This product requires a custom quote. Please contact our sales team for pricing information or submit an RFQ (Request for Quote).
Available Inventory
| Condition | Stock |
|---|---|
| New Surplus | 55 Available |
Product Description
The a125b77 is an all-metal prevailing-torque self-locking nut designed to resist loosening under vibration and thermal cycling. Manufactured to AN363/MS21045 or NASM21042 aerospace standards, this stiffnut uses an internal nylon insert or deformed thread design to create friction that prevents unintended rotation. Installed on firewall-forward engine attachments and high-temperature structural connections where vibration resistance is critical.
Installation requires adherence to prevailing-torque limits specified in the aircraft maintenance manual; avoid use in applications with relative motion between mating parts.
Please note: Product descriptions are provided for informational purposes. Always refer to your aircraft's Illustrated Parts Catalog (IPC) to verify part compatibility and specifications.
Frequently Asked Questions
What is the STIFFNUT (P/N a125b77)?
The a125b77 is an all-metal prevailing-torque self-locking nut designed to resist loosening under vibration and thermal cycling. Manufactured to AN363/MS21045 or NASM21042 aerospace standards, this stiffnut uses an internal nylon insert or deformed thread design to create friction that prevents unintended rotation.
Does the a125b77 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 a125b77 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 a125b77.
Can I order the a125b77 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.