BOLT,MACHINE (P/N an4h4a) - New Surplus

The AN4H4A is an AN4 series hex-head machine bolt with a drilled head and undrilled shank, manufactured from alloy steel per AN standard specifications. The -4 designation indicates 1/2-inch nominal under-head length, designed for structural joints requiring safety-wire retention. The drilled head accommodates safety wire to lock the bolt with a self-locking nut on the undrilled shank, preventing fastener loosening under vibration.

Installation requires torquing per aircraft maintenance manual specifications and verifying grip length against the Illustrated Parts Catalog. Common in airframe structural assemblies and control surface attachments.

What is the BOLT,MACHINE (P/N an4h4a)?

The AN4H4A is an AN4 series hex-head machine bolt with a drilled head and undrilled shank, manufactured from alloy steel per AN standard specifications. The -4 designation indicates 1/2-inch nominal under-head length, designed for structural joints requiring safety-wire retention.

Does the an4h4a 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 an4h4a 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 an4h4a.

Can I order the an4h4a 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.