BOLT, MACHINE (P/N an4-23) - New Surplus

The AN4-23 is a 1/4-inch hex head machine bolt conforming to Aeronautical Standard specifications. Manufactured from alloy steel with a drilled shank for cotter pin safety retention, this bolt features 1/4-28 UNF-3A threading. Commonly installed with castellated nuts in aircraft control system clevis joints and structural connections.

The drilled shank design prevents bolt rotation during operation, critical for maintaining control surface integrity. Installation requires verification of grip length, proper torque application per FAA AC 43.13-1B, and safety wire or cotter pin installation through the shank hole.

What is the BOLT, MACHINE (P/N an4-23)?

The AN4-23 is a 1/4-inch hex head machine bolt conforming to Aeronautical Standard specifications. Manufactured from alloy steel with a drilled shank for cotter pin safety retention, this bolt features 1/4-28 UNF-3A threading.

Does the an4-23 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 an4-23 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 an4-23.

Can I order the an4-23 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.