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ARP 218-4701 Cylinder Head Stud Kit 12-Point 8740 Chrome Moly Steel

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

218-4701
05/31/2036 8:00 PM
Sale Price

$152.57

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The ARP 218-4701 is a professional-grade cylinder head stud kit engineered for high-performance and competition engines. Built from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these studs deliver exceptional strength and reliability for demanding applications.

Key Features:

  • Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
  • 12-point head design for improved wrench engagement
  • Vertical rack heat-treatment ensures complete and uniform heat penetration
  • Centerless ground for precise concentricity and perfect alignment
  • Thread rolled after heat-treat for 10x better fatigue strength
  • Undercut short studs equalize stretch for consistent clamping force
  • Includes hardened parallel-ground washers for even load distribution

Manufacturing Excellence:

ARP's manufacturing process sets the standard for fastener quality. Each stud is precisely heat-treated in vertical racks rather than batch-processed, ensuring consistent properties throughout. The centerless grinding process involves multiple precision cuts to achieve exceptional straightness and concentricity, allowing cylinder heads and gaskets to align perfectly during installation. Thread rolling is performed after heat-treatment, which significantly increases fatigue resistance compared to pre-heat-treat threading methods used by competitors.

Performance Advantages:

Head studs offer significant advantages over traditional head bolts. During installation, studs stretch only along the vertical axis when the nut is torqued, providing more accurate and consistent clamping force. Bolts, by contrast, experience both torsional and tensile stress simultaneously, leading to less predictable loading. The undercut design on shorter studs helps equalize stretch across all fasteners, compensating for head gasket compression and reducing the risk of gasket failure. This results in superior engine sealing and consistent performance.

Installation Notes:

Studs should be installed finger-tight in a relaxed state?never force them in using a jammed nut. Apply torque only to the nut during final assembly. After initial engine operation, re-torque all fasteners to compensate for head gasket compression. The 12-point head design and wide-area flange eliminate the need for valve train removal when retorquing cylinder heads.

Trusted by professional engine builders across all forms of motorsport, ARP Pro Series studs represent the highest quality fastener solution available for competition and high-performance engines.

Products specifications

Cut to Fit

No

Fastener Finish

Black oxide

Fastener Material

8740 chromemoly

Fastener Style

Stud

Head Style

12-point

Quantity

Sold as a kit.

Washers Included

Yes

2 Day Air need ASAP please thank you.

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Fast delivery. Item as described.

I will shop here again if needed

Easy to order. Delivered in three business days... not ten. Very surprised and very satisfied.

easy to order through your website

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Ordered a set of Bilsteins on Sat. afternoon, and woke up today (monday) with a shiiping order #...Place is awesome, will order/refer..thank you

first time on site .was easy to figure out

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