WASHER (P/N 27s5-1) - New Surplus

The 27S5-1 is a lock washer designed to distribute load and resist fastener loosening in aircraft structural joints. This hardened steel washer installs under a nut, maintaining clamp-up force through vibration and thermal cycling. Conforms to AN960 or NAS1149 specifications common in general and commercial aviation.

Installation follows FAA AC 43.13-1B guidance—verify size and specification in your aircraft Illustrated Parts Catalog before use. Torque per manufacturer recommendations for proper preload.

What is the WASHER (P/N 27s5-1)?

The 27S5-1 is a lock washer designed to distribute load and resist fastener loosening in aircraft structural joints. This hardened steel washer installs under a nut, maintaining clamp-up force through vibration and thermal cycling.

Does the 27s5-1 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The 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 27s5-1 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 27s5-1.

Can I order the 27s5-1 in custom quantities?

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