BEAS-WASHER CTSUNK (P/N nas391b4p) - New Surplus

The NAS391B4P is a #4 countersunk finishing washer manufactured from brass per National Aerospace Standards. This washer seats flat head screws flush with panel surfaces while distributing load across a clean bearing surface. Commonly installed on avionics panels and instrument assemblies where a recessed fastener appearance is required.

The washer pairs with matching #4 flat head screws and should be torqued according to aircraft maintenance manual specifications. Brass construction provides corrosion resistance in cockpit and avionics bay environments.

What is the BEAS-WASHER CTSUNK (P/N nas391b4p)?

The NAS391B4P is a #4 countersunk finishing washer manufactured from brass per National Aerospace Standards. This washer seats flat head screws flush with panel surfaces while distributing load across a clean bearing surface.

Does the nas391b4p meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The BEAS-WASHER CTSUNK 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 nas391b4p 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 nas391b4p.

Can I order the nas391b4p in custom quantities?

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