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ARP 672-1003 Metric 12-Point Stainless Steel Bolt Kit M12

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

672-1003
07/13/2036 4:48 AM
Sale Price

$12.95

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

The ARP 672-1003 is a premium 5-piece metric bolt kit featuring high-strength 12-point fasteners designed for differential, ring and pinion, and general automotive, marine, and trailer applications. These fasteners are manufactured from ARP's specially alloyed 300 stainless steel, offering a nominal tensile strength rating of 180,000 psi?significantly exceeding Grade 8 hardware specifications for superior clamping force and reliability.

Key Features:

  • M12 metric 12-point bolt heads for precise torque application
  • ARP 300 stainless steel construction with polished finish
  • 180,000 psi tensile strength for exceptional durability
  • Corrosion-resistant and maintenance-free
  • Includes matching washers (5 pieces total)
  • Suitable for automotive differentials, marine, and trailer applications

ARP's precision-manufactured stainless steel fasteners provide both superior performance and exceptional appearance. The polished stainless finish resists rust and corrosion in demanding environments, while the 12-point head design allows for easier installation in tight spaces with better tool engagement. Each kit includes washers for complete installation convenience.

Products specifications

Fastener Finish

Black oxide

Fastener Head Style

12-Point

Fastener Material

Chromemoly

Fastener Yield Strength (psi)

170,000 psi

Material

Black Oxide

Quantity

Sold as a set of 5.

Size

M10 x 1.50 x 30

Underhead Length (in)

1.181 in.

Underhead Length (mm)

30mm

Washers Included

Yes

Wrench Diameter

12mm

Wrenching

12mm

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The best prices and fast shipping!

Ordered Monday and shipped out Tuesday. Fast shipping and cheapest price I found online. Would order again especially with the free shipping.

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Easy website to shop on. Good phone support. Package will be arriving in a timely manner. All in all seems like a good company.

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