Insert Washers - 7/16 ID (10)

The ARP Insert Washers - 7/16 ID (10) are precision-engineered fastener components designed for use with ARP head bolts in high-performance engine builds and heavy-duty applications. These washers distribute clamping load evenly across bolt holes, preventing surface damage and ensuring consistent fastener preload. Available as a set of 10, they are essential for anyone assembling or rebuilding engines where bolt integrity and joint stability are non-negotiable.

Manufactured from chromoly steel and finished in black oxide, these washers offer superior strength and corrosion resistance compared to standard mild steel alternatives. The 7/16 inch inner diameter (ID) accommodates ARP fasteners of that specification, while the 0.812 inch outer diameter (OD) and 0.571 inch insert OD provide optimal load distribution geometry. Black oxide coating protects against rust and oxidation in demanding engine environments, from street engines to competition applications, while maintaining a professional appearance under the hood.

These insert washers are ideal for cylinder head bolt installation, intake manifold fastening, and other critical joints where controlled preload and load spreading are required. Engine builders, performance shops, and serious enthusiasts rely on ARP fastener systems to eliminate stretch and galling while achieving precise clamping force. Whether you're assembling a stock rebuild or a high-horsepower stroker engine, these washers ensure that every bolt joint meets professional specifications and maintains integrity under sustained load and thermal cycling.