BOLT, MACHINE (P/N an5-21a) - New Surplus

The AN5-21A is a 5/16-inch hex head machine bolt manufactured from heat-treated alloy steel to AN standards for aircraft structural fastening. The undrilled shank design pairs with self-locking nuts to prevent fastener loosening under vibration. This bolt meets airworthiness requirements for primary and secondary structure applications across general and commercial aviation.

Installation requires matching grip length to joint thickness and applying torque per aircraft maintenance manual specifications and AN/NAS hardware guidance.

What is the BOLT, MACHINE (P/N an5-21a)?

The AN5-21A is a 5/16-inch hex head machine bolt manufactured from heat-treated alloy steel to AN standards for aircraft structural fastening. The undrilled shank design pairs with self-locking nuts to prevent fastener loosening under vibration.

Does the an5-21a meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The BOLT, MACHINE 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 an5-21a 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 an5-21a.

Can I order the an5-21a in custom quantities?

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