SCREW,CLOSE TOLERANCE (P/N nas517-4-9) - New Surplus

The NAS517-4-9 is a 100° flush head machine screw with close tolerances for precision airframe assembly. Manufactured from alloy steel with a 1/4-28 UNF thread and cross-recess drive, this fastener is designed for shear-loaded joints where minimal play and precise alignment are critical. Used in close-fit structural connections throughout aircraft fuselage and wing assemblies.

Installation requires adherence to NAS517 dimensional specifications and torque values specified in the aircraft maintenance manual. Periodic inspection ensures fastener integrity under flight loads and vibration.

What is the SCREW,CLOSE TOLERANCE (P/N nas517-4-9)?

The NAS517-4-9 is a 100° flush head machine screw with close tolerances for precision airframe assembly. Manufactured from alloy steel with a 1/4-28 UNF thread and cross-recess drive, this fastener is designed for shear-loaded joints where minimal play and precise alignment are critical.

Does the nas517-4-9 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The SCREW,CLOSE TOLERANCE 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 nas517-4-9 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 nas517-4-9.

Can I order the nas517-4-9 in custom quantities?

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