SCREW (P/N 4-40unc) - New Surplus

The 4-40UNC is a steel machine screw conforming to ASME B1.1 Unified National Coarse thread specifications. This fastener secures D-sub connector backshells and jack-screws in avionics panel installations. The 4-40 thread pitch provides reliable clamping force for small-diameter fastener joints in electronics hardware applications.

Installation requires verification of screw length, head style, and thread class against the aircraft's Illustrated Parts Catalog and connector specification documentation.

What is the SCREW (P/N 4-40unc)?

The 4-40UNC is a steel machine screw conforming to ASME B1. 1 Unified National Coarse thread specifications.

Does the 4-40unc meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The SCREW 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 4-40unc 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 4-40unc.

Can I order the 4-40unc in custom quantities?

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