Countersunk Washer Black #10 10pk

The ALLSTAR PERFORMANCE Countersunk Washer Black #10 10-pack (SKU ALL 18661) is a precision fastening component designed for applications requiring flush-mounted washers that sit flush with the surface of aluminum or composite materials. Each washer features a #10 hole (0.190" diameter nominal) with a 1-inch outer diameter and 0.188-inch thickness, engineered to distribute load evenly while maintaining a clean, recessed profile essential in automotive fabrication, aerospace assembly, and precision mechanical projects.

Constructed from aluminum and finished with black anodized coating, these countersunk washers resist corrosion and oxidation while providing superior electrical conductivity where needed. The black anodized surface offers both functional protection and aesthetic consistency across fastened assemblies. The countersunk design accommodates socket head cap screws or similar fasteners, allowing the screw head to sit flush with the washer surface—critical when aerodynamic profile, panel alignment, or vibration isolation demands zero protrusion. At 0.14 lbs per 10-pack, these washers add minimal weight while maximizing structural integrity in weight-sensitive applications.

This 10-pack is ideal for builders, fabricators, and mechanics working on custom automotive frames, aluminum body panels, aircraft components, or modular mechanical systems where multiple countersunk fasteners are required. The #10 size is versatile across small-to-medium fastening applications, and the quantity allows for project assembly plus future replacement stock. Precision tolerances and anodized durability make these washers suitable for both indoor shop use and outdoor applications exposed to weather and temperature cycling.