ARP M12 ID x 0.86 OD Chamfer Black Washer – Pack of 10

This ARP performance fastener, stud, bolt, tool, or assembly is the M12 ID x 0.86 OD Chamfer Black Washer – Pack of 10. Confirm the exact engine or vehicle application, thread size, length, material, strength series, included quantity, installation lubricant, tightening sequence, and current ARP torque specification before ordering.

Key Features

• Exact Dimensions: M12 inner diameter and 0.86 inch outer diameter align perfectly with ARP Pro Series studs to prevent misalignment and ensure secure clamping force.
• High-Strength Steel Construction: Forged 8740 chrome moly alloy steel handles 200000 PSI tensile loads in cylinder head mains and rod applications.
• Chamfered Edges: Beveled design seats flush against cylinder heads or blocks reducing stress risers for smoother high-torque assembly and operation.
• Black Oxide Finish: Corrosion-resistant coating thrives in oily wet engine bays to prolong washer durability under continuous high-heat exposure.
• Precision machined in USA for tolerances under thousandths of an inch.
• Yes designed for ARP LS Gen III IV head studs M12x1.25 in Corvette Camaro Firebird Silverado trucks and similar LS applications.

Fitment

Specifications

What’s Included

One new ARP hardware kits – other in the exact configuration and quantity identified by this listing. Brackets, wiring, air lines, fittings, switches, fasteners, fitting kits, fluids, covers, and accessories are included only when expressly stated for this exact part.

About ARP

Automotive Racing Products manufactures high-performance studs, bolts, nuts, washers, wheel hardware, assembly tools, and installation lubricants for engine, drivetrain, chassis, and racing applications. Thread dimensions, material, preload method, lubricant, torque, and included quantity remain exact-part specific.

Important Disclosures

• California Proposition 65 warning applies. Review the current manufacturer warning before handling or installation.

Related Parts

• Shop all ARP products
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• ARP 01-06 6.6L GM Duramax Diesel Flywheel Bolt Kit
• ARP 01-10 6.6L GM Duramax Diesel Flexplate Bolt Kit

Frequently Asked Questions

How do I confirm the M12 ID x 0.86 OD Chamfer Black Washer – Pack of 10 fits my application?
Match the exact engine family or vehicle, component location, thread diameter and pitch, under-head length, material, strength series, and every current ARP application note.

Can I reuse the factory torque value with this ARP hardware?
Not automatically. Use ARP’s current instructions for the exact part, material, lubricant, tightening sequence, and preload method. Factory torque values may be based on different hardware and friction.

What is included with this ARP kit?
Only the studs, bolts, nuts, washers, lubricant, and tools expressly listed for this exact part number are included. Verify the required quantity before disassembly.

Installation Instructions

1. Confirm ARP part number 200-8448, the complete application, and every required supporting component before beginning work.
2. Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
3. Follow ARP’s current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
4. Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.