WASHER (P/N sp55b) - New Surplus

The sp55b is a steel double-coil spring washer designed for 4 BA screws in aircraft fastening applications. This washer resists vibration-induced loosening by maintaining clamp load under operational stress. Install directly under the screw head or nut to distribute pressure across a wider surface area and prevent fastener rotation.

BA thread sizes follow British Standards specifications for small-diameter precision fasteners. Verify washer compatibility with your aircraft's Illustrated Parts Catalog and follow maintenance manual torque guidance during installation to ensure proper load retention.

What is the WASHER (P/N sp55b)?

The sp55b is a steel double-coil spring washer designed for 4 BA screws in aircraft fastening applications. This washer resists vibration-induced loosening by maintaining clamp load under operational stress.

Does the sp55b 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 sp55b 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 sp55b.

Can I order the sp55b 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.