ARP 1/2in x 5.250in Long Broached Allen Head Stud (Single Stud)

This ARP performance fastener, stud, bolt, tool, or assembly is the 1/2in x 5.250in Long Broached Allen Head Stud (Single Stud). 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

• ARP2000 Alloy Construction: Forged from proprietary steel with 220,000 psi tensile strength and 155,000 psi yield for repeated high-load use.
• 1/2-20 Thread x 5.250in Length: Exact dimensions match OEM and aftermarket head/main stud requirements in SBC builds.
• Broached Allen Head: 5/16in hex socket allows accurate wrenching without damaging threads during install or removal.
• Rolled Threads: Increases fatigue resistance by 1000% over cut threads for long-term durability under vibration.
• Black Oxide Finish: Resists corrosion and galling while providing smooth thread engagement.
• Box dimensions 6 x 2 x 1 inches weight 0.25 lbs.

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.

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 5.5.310 ARP2000 Stud

Frequently Asked Questions

How do I confirm the 1/2in x 5.250in Long Broached Allen Head Stud (Single Stud) 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 AR5.250-1LB, 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.