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ARP 235-2501 Harmonic Balancer Bolt Kit with 12-Point Head

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

235-2501
07/13/2036 4:52 AM
Sale Price

$27.98

In Stock (9)

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's high-strength harmonic balancer bolt kit is engineered to withstand the extreme kinetic energy absorbed by the crankshaft balancer during engine operation. These ultra-strong bolts are rated at 200,000 psi tensile strength, allowing maximum clamping force to keep the balancer securely locked in position as the crankshaft flexes and twists.

Key Features:

  • 200,000 psi tensile strength for superior clamping force
  • Extra tall 12-point head design accepts deep sockets and prevents stripping
  • 1/4 inch thick wide-area washer distributes load evenly
  • Manufactured from heat-treated 8740 chrome moly steel
  • Durable black oxide finish for corrosion resistance

Square Drive Feature:

  • Integrated 1/2 inch square drive forged into bolt head
  • Enables engine rotation using any standard 1/2 inch drive ratchet or breaker bar
  • Eliminates need for separate tools when manually rotating the crankshaft assembly

This professional-grade fastener solution ensures reliable harmonic balancer retention in high-performance and racing applications where engine?? and stress levels exceed factory specifications.

Products specifications

Overall Diameter

1/2-20

Fastener Finish

Black oxide

Fastener Material

Chromemoly

Fastener Yield Strength (psi)

200,000 psi

Head Style

12-point

Notes

This bolt requires a 13/16 in. socket.

Quantity

Sold individually.

Socket

13/16

Thread Size

1/2-20 RH in.

UHL

1.55

Underhead Length (in)

1.500 in.

Washer Included

Yes

Everything was good. No problems and a great price.

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Product arrived very quick. So far i'm very impressed.

EASY ORDERING

very good

Their web site was easy to navigate. They had the product I needed. They delivered it promptly. Well done.

Great product, fast shipping!!

Great simple ordering process.

So far So good. Good prices and reasonable shipping.

The site was easy to navigate and find what I needed. The price was the best I could find for the Husky weatherbeater floor mats that I needed for my car. Shipping was fast. Can't wait to have them in my car.

Great price, great business and quick shipping. Excellent transaction and would recommend them again.

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