WASHER SPRING 1/4 UN (P/N sp47-e) - New Surplus

The sp47-e is a steel spring lock washer designed for 1/4-inch Unified fasteners. This washer maintains bolt preload and resists vibration-induced loosening in aircraft structural and mechanical assemblies. It conforms to MS35338 specifications (formerly AN935 standard).

Install the washer directly beneath the bolt head or nut to create spring tension that compensates for joint relaxation during flight operations. Verify washer size against the aircraft Illustrated Parts Catalog before installation and follow applicable maintenance manual procedures for torque and assembly sequence.

What is the WASHER SPRING 1/4 UN (P/N sp47-e)?

The sp47-e is a steel spring lock washer designed for 1/4-inch Unified fasteners. This washer maintains bolt preload and resists vibration-induced loosening in aircraft structural and mechanical assemblies.

Does the sp47-e meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The WASHER SPRING 1/4 UN 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 sp47-e 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 sp47-e.

Can I order the sp47-e in custom quantities?

Yes, we sell hardware in various quantities from single units to bulk lots. The WASHER SPRING 1/4 UN is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.