BOLT (P/N an4-20a) - New Surplus

The AN4-20A is a hex head aircraft bolt conforming to AN/NASM4 specifications. The undrilled shank (denoted by the 'A' suffix) accommodates stop-nut installations without requiring a cotter pin. Constructed from alloy steel, this bolt fastens structural components and control linkages throughout airframe assemblies.

Common applications include control linkage clevis joints and structural attachment points. Installation requires selecting grip length to match the material stack thickness and torquing the mating AN nut per aircraft maintenance manual specifications.

What is the BOLT (P/N an4-20a)?

The AN4-20A is a hex head aircraft bolt conforming to AN/NASM4 specifications. The undrilled shank (denoted by the 'A' suffix) accommodates stop-nut installations without requiring a cotter pin.

Does the an4-20a meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The BOLT 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 an4-20a 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 an4-20a.

Can I order the an4-20a in custom quantities?

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