ARP M12 ID 1.55 OD .250 Thick Chamfer Black Washer (Single)

This ARP performance fastener, stud, bolt, tool, or assembly is the M12 ID 1.55 OD .250 Thick Chamfer Black Washer (Single). 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

• 1.55 Inch Outer Diameter: Covers wide bearing area to spread clamping force and reduce stress on aluminum rods.
• 0.250 Inch Thickness: Maintains proper stack height under extreme cylinder pressures in boosted applications.
• M12 Inner Diameter: Matches ARP M12 x 1.5 pitch rod bolts used in K-Series connecting rods for precise fit.
• High-tensile steel withstands 200000 PSI tensile strength.
• Chamfered Edges: Allows smooth bolt seating without damaging rod bolt heads or threads during assembly.
• Black Oxide Finish: Shields against rust and chemicals in oil-lubricated engine compartments.

Fitment

Specifications

What’s Included

One new ARP hardware – single 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
• ARP 1/2 x 6.5in Long Broached Individual Stud
• ARP 1/2in -20 12pt Nut (Single Nut)
• ARP 1/2in x 5.250in Long Broached Allen Head Stud (Single Stud)

Frequently Asked Questions

How do I confirm the M12 ID 1.55 OD .250 Thick Chamfer Black Washer (Single) 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 200-8751, 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.