CONICAL WASHER (P/N 7n4) - New Surplus

The 7n4 is a conical (Belleville) washer that maintains bolt preload in aircraft fastener assemblies during vibration and thermal cycling. This spring-profile washer supplies axial tension under the bolt head or nut, preventing fastener loosening in critical joints. Typically manufactured from spring steel, the conical shape provides load retention across temperature variations and operational stress.

Install with proper stacking orientation per aircraft maintenance manual specifications. Used in structural bolts, engine mounts, and control surface attachments where preload stability is essential.

What is the CONICAL WASHER (P/N 7n4)?

The 7n4 is a conical (Belleville) washer that maintains bolt preload in aircraft fastener assemblies during vibration and thermal cycling. This spring-profile washer supplies axial tension under the bolt head or nut, preventing fastener loosening in critical joints.

Does the 7n4 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The CONICAL WASHER 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 7n4 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 7n4.

Can I order the 7n4 in custom quantities?

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