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ARP 621-1000 Stainless Steel Hex Bolt 1/4-20 x 1.000 (5-Pack)

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

621-1000
07/13/2036 1:05 PM
Sale Price

$11.30

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 621-1000 HEX BLT 1/4-20X1.000 PK/5

Standard Bolt; 1/4 Inch - 20 Thread Size; 1.000 Inch Under Head Length; 5/16 Inch Socket Size; Hex Style Head Type; Polished; Stainless Steel; 5 Pack

Products specifications

Fastener Finish

Polished

Fastener Head Style

Hex

Fastener Material

Stainless steel

Fastener Yield Strength (psi)

170,000 psi

Quantity

Sold as a set of 5.

Size

1/4-20 x 1

Thread Size

1/4-20 in.

Underhead Length (in)

1.000 in.

Washers Included

Yes

Wrench Diameter

5/16 in.

Wrenching

5/16

Very satisfied with this company. Ordered the part from another company and had nothing but problems. We found this place and the part was cheaper and they delivered the right part! Will do busy with again.

Very happy with my purchase. SUPER fast shipping and great communication. Will use again!

Really good prices and fast delivery.

Good so far.

Very easy to talk to on the phone and excellent service.

Autoplicity has made my parts search so much easier. With the best price gurantee, i can now make autoplicity my one-stop shop for all my parts needs.

Lowest prices and fast shipping made this a great transaction.

I'm very pleased with Autoplicity. i needed a new battery for my antique Ford.After much searching,I found Autoplicity had it for over $25.00 less than the next lowest price I found. My order was shipped in less than 24 hrs. Thank you. I'll be recommending Autoplicity on the Ford forums I belong to

A+ part as advertised, quick shipping.

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