ARP 200-8548 High Performance Washer M12 ID .875" OD Chromoly

The ARP 200-8548 is a precision-engineered high-performance washer designed for use with cylinder head fasteners and other critical engine applications. This washer features an M12 inside diameter with a .875" outside diameter and is manufactured to exacting 0.120" thickness specifications.

Key Features:

• M12 inside diameter (.472") for metric fastener applications
• .875" outside diameter provides optimal load distribution
• 0.120" thickness for proper clamping force
• Inside diameter chamfer to accommodate radius between bolt shank and head
• Constructed from premium 8740 chromoly steel for superior strength
• Parallel-ground for precise flatness and uniform load transfer
• Heat-treated and hardened for maximum durability
• Black oxide finish for corrosion resistance

ARP washers are essential components in high-performance engine builds, providing the proper bearing surface and load distribution required for cylinder head studs and bolts. The chamfered inside diameter creates necessary clearance for the radius between the fastener shank and head, preventing interference and ensuring proper torque values. Sold in a convenient 2-piece package.