ARP M8 x 1.25 x 45mm Broached Stud Kit (16 pieces)

This ARP performance fastener, stud, bolt, tool, or assembly is the M8 x 1.25 x 45mm Broached Stud Kit (16 pieces). 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

• Stud configuration: Minimizes cylinder head or manifold thread wear while ensuring even load distribution.
• Manufactured from 8740 chrome-moly steel with 200000 psi tensile strength.
• Broached head design: Allows easy installation and removal with standard tools without damaging threads.
• Precise threading: M8 x 1.25 pitch matches OEM specs for direct replacement on Subaru EJ turbo manifolds.
• Complete 16-piece kit: Covers both exhaust manifolds with extras for maintenance or repairs.
• Forged 8740 alloy steel with black oxide coating for corrosion resistance and consistent friction.

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 M8 x 1.25 x 45mm Broached Stud Kit (16 pieces) 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 400-8033, 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.