ARP M8 x 1.25 12pt Nut Kit

This ARP performance fastener, stud, bolt, tool, or assembly is the M8 x 1.25 12pt Nut Kit. 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

• Forged 8740 Chromoly Steel: Handles extreme tensile loads and resists fatigue in boosted high-horsepower B16 B18 D16 engine setups.
• 12-Point Design: Delivers firm tool grip to prevent rounding and enable accurate torquing on rod bolts and main studs.
• Precise M8 x 1.25 Threads: Provides exact match to ARP metric fasteners on rods mains and cylinder heads.
• Lightweight design ships in compact protective box 3 x 4 x 1 inches.
• Forged 8740 chromoly steel heat treated with black oxide finish for corrosion resistance and strength.
• Made in USA with aerospace-grade manufacturing standards.

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 01-10 6.6L GM Duramax Diesel Flexplate Bolt Kit

Frequently Asked Questions

How do I confirm the M8 x 1.25 12pt Nut Kit 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 300-8310, 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.