ARP M12 8740 Black Oxide 12-pt Nut Kit

This ARP performance fastener, stud, bolt, tool, or assembly is the M12 8740 Black Oxide 12-pt 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

• 8740 Chrome Moly Steel: Forged construction rated at 180,000 PSI tensile strength to withstand extreme cylinder pressures and vibrations.
• 12-Point Head Design: Provides 12 contact points for positive grip using 19mm 12-point socket and better access around headers.
• Black Oxide Finish: Resists corrosion and galling while allowing smooth torquing in engine bays.
• Precision CNC machined threads for consistent preload and sealing.
• Made from 8740 chrome moly steel with black oxide coating for strength corrosion resistance and reduced friction.
• Direct replacement for OEM or stock nuts on ARP M12x1.5 studs.

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.

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• Shop all ARP products
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Frequently Asked Questions

How do I confirm the M12 8740 Black Oxide 12-pt 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 301-8309, 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.