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ARP 134-7124 High Performance Rocker Arm Stud 3/8-24 Thread

Manufacturer

ARP

<h3>The Gold Standard in Performance Fasteners</h3> <p>When racing enthusiast Gary Holzapfel recognized that fastener failure was causing many engine breakdowns in 1968, he founded Automotive Racing Products (ARP) to solve a critical problem in motorsports. Drawing on his aerospace fastener manufacturing experience, Holzapfel created a company that would revolutionize the performance fastener industry. Today, ARP stands as the world's premier manufacturer of high-strength bolts, studs, nuts, and specialized hardware for racing and high-performance applications.</p> <p>ARP controls all aspects of the manufacturing process in-house, with all operations closely monitored, enabling the company to maintain its reputation for zero-defect quality. Every fastener undergoes forging, heat treatment, thread rolling, and precision finishing at ARP's Southern California facilities, which span over 115,000 square feet. This vertically integrated approach ensures that each component meets exacting standards for strength, fatigue resistance, and reliability under extreme conditions.</p> <h3>Engineered for Championship Performance</h3> <p>ARP's customer roster reads like a who's who of professional motorsports. The product line ranges from quality high-performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications. The company's fasteners have secured victories in virtually every major racing championship worldwide, from Top Fuel dragsters to Formula One cars, proving their worth under the most demanding conditions imaginable.</p> <p>The brand's <a href="/48-arp-engine-cylinder-head-bolt-set-10306">engine cylinder head bolt sets</a> represent the cornerstone of ARP's catalog, offering engine builders the clamping force and reliability needed to prevent head gasket failure in high-boost and high-compression applications. These precision-engineered fasteners utilize proprietary materials and heat treatments that deliver up to ten times the fatigue strength of conventional bolts, making them essential for any serious performance build.</p> <p>For engine internals, ARP manufactures <a href="/48-arp-engine-connecting-rod-5276">connecting rods</a> designed to withstand extreme cylinder pressures and high RPM loads. Each rod is manufactured to aerospace standards with tight tolerances and superior material properties. Whether you're building a street performance engine or a full competition powerplant, ARP connecting rods provide the strength and consistency that professional engine builders demand.</p> <h3>Complete Fastener Solutions</h3> <p>Beyond engine components, ARP's product range extends throughout the entire vehicle. The company's <a href="/48-arp-wheel-lug-stud-7680">wheel lug studs</a> offer critical safety and performance benefits for racing and high-performance street applications, providing greater clamping force and durability than factory studs. ARP's product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline.</p> <p>Individual <a href="/48-arp-engine-cylinder-head-bolt-5308">engine cylinder head bolts</a> are also available for custom applications or specific replacement needs, manufactured to the same exacting standards as complete sets. This flexibility allows builders to source exactly what they need for specialized builds or repairs without compromising on quality.</p> <p>What sets ARP apart is not just the breadth of their catalog, but their willingness to develop custom solutions for unique applications. The company maintains complete R&D capabilities, including metallurgical research, product design, prototype machining, and extensive laboratory testing. This engineering expertise ensures that whether you're installing a simple head stud kit or building a record-setting race engine, ARP fasteners deliver the reliability and performance that professionals trust.</p>

Part Number

134-7124
07/13/2036 12:07 PM
Sale Price

$9.20

In Stock (10+)

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

ARP rocker arm studs solve the common problem of wobbling, misaligned studs that create inconsistent rocker geometry. Manufactured from 8740 chrome moly forgings and heat-treated to 180,000 psi tensile strength, these precision studs are concentric within .005 total indicator runout (T.I.R.) from thread pitch to thread pitch, ensuring they install straight and true every time.

Key Features:

  • Made from 8740 chrome moly forgings, heat-treated to 180,000 psi for exceptional strength and durability
  • Precision-manufactured to .005 T.I.R. tolerances for perfectly straight installation and consistent rocker geometry
  • Extra-large radius base provides superior resistance to flex under high valve spring pressures
  • Ground-flush tips ensure optimum adjuster seating and stability
  • Exact lengths guarantee positive seating and proper rocker arm positioning
  • Designed for use with ARP Perma-Loc adjusters (sold separately), not OEM self-locking nuts

Specifications:

  • Overall stud height: 1.895 inches
  • Screw-in thread depth: .710 inches
  • Adjuster thread depth: 1.000 inches
  • Shank diameter and thread: 3/8-24
  • Base diameter and thread: 7/16-14

Ideal for E.T. bracket racing, limited-rule oval track competition, and high-performance street applications. When using longer-than-stock pushrods or valves, verify proper rocker arm stud length to maintain correct installed height and geometry.

Products specifications

Adjuster Thread Depth

1

Base Dia/Thread

7/16-14

Base Thread Length (in)

0.710 in.

Base Thread Size

7/16-14 in.

Effective Stud Length (in)

1.895 in.

Guideplate Locator Shank

Yes

Notes

Machine work may be required.

Quantity

Sold as a pair.

Rocker Arm Nut Thread Length (in)

1.000 in.

Rocker Arm Nut Thread Size

3/8-24 in.

Screw-In Thread Depth

0.71

Shank Dia/Thread

3/8-24

Stud Height

1.895

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