SCREW,TAPPING (P/N an531-4r6) - Serviceable, New Surplus

The AN531-4R6 is a #4 by 3/8 inch steel tapping screw with an 82° flat countersunk head and Phillips drive. Built to Army-Navy standard specifications, this fastener forms its own mating thread in light-gauge sheet metal and thin materials. The countersunk head sits flush with the surface for aerodynamic installations on aircraft fuselage panels, access covers, and structural sheet-metal components.

Installation requires proper countersink depth and Phillips driver torque per the aircraft maintenance manual to ensure secure fastening without material damage or thread stripping.

What is the SCREW,TAPPING (P/N an531-4r6)?

The AN531-4R6 is a #4 by 3/8 inch steel tapping screw with an 82° flat countersunk head and Phillips drive. Built to Army-Navy standard specifications, this fastener forms its own mating thread in light-gauge sheet metal and thin materials.

Does the an531-4r6 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The SCREW,TAPPING 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 an531-4r6 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 an531-4r6.

Can I order the an531-4r6 in custom quantities?

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