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ARP 1/4-20 x 0.515 Hex Stainless Steel Bolts (5/pkg) - Polished Finish, Includes Washers - 621-0515

Upgrade Your Fasteners with ARP 621-0515 Bolts

If you're looking to enhance the integrity of your engine components, the ARP 621-0515 Bolts are a solid choice for automotive enthusiasts who value performance and reliability. These bolts are designed with precision, ensuring they fit perfectly in various applications, making them a must-have for those who work on their own vehicles.

Fitment

These bolts are specifically engineered for a range of applications where a 1/4-20 RH fastener is needed. Whether you're working on a classic build or a modern performance vehicle, these ARP bolts will provide the strength and durability you require.

Technical Specs

  • Fastener Size: 1/4-20 in. RH
  • Underhead Length: 0.515 in.
  • Fastener Head Style: Hex head
  • Fastener Material: Stainless steel
  • Fastener Finish: Polished
  • Fastener Grade: ARP Stainless 300
  • Fastener Yield Strength: 180,000 psi
  • Wrench Diameter: 5/16 in.
  • Washers Included: Yes
  • Quantity: Sold as a set of 5

Why Choose ARP 621-0515 Bolts?

Constructed from ARP Stainless 300, these bolts boast a yield strength of 180,000 psi, making them ideal for high-stress applications. The polished finish not only looks great but also helps resist corrosion, ensuring they stand the test of time. With a hex head design, these bolts are easy to install, allowing you to tackle your projects with confidence.

Customer Feedback

A 2021 Ford F-150 owner shared, “I used the ARP 621-0515 bolts on my engine rebuild, and they fit perfectly. The extra strength gives me peace of mind, especially when I’m pushing my truck to the limits.” Another customer working on a 2019 Subaru WRX noted, “These bolts were a perfect match for my new turbo setup. The installation was straightforward, and I love the polished look.”

Whether you're upgrading your engine, securing components, or simply replacing worn-out fasteners, the ARP 621-0515 Bolts are a reliable choice. Trust in ARP's reputation for quality and performance to keep your ride running strong.

Other Part Numbers:
ARP Bolts #arp621-0515

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

ARP Bolts Logo

The Story Behind ARP Bolts

ARP (Automotive Racing Products) was founded by Gary Holzapfel in 1968 when he noticed his drag-racing friends succumbing to bolt-induced engine failure as a result of poor-quality fasteners. He drew upon his expertise in the aerospace industry to develop a solution, which turned into a successful business nonetheless. 

Since its inception, ARP has been engineering and perfecting a wide range of bolts, studs, nuts, and other fasteners for engines, cylinder heads, headers, wheels, and transmissions. Today, ARP remains the undisputed world leader in automotive fasteners. Racing aficionados everywhere know and recognize the ARP brand and can vouch for its quality.

What Makes ARP Bolts So Special?

Located in Ventura, California, all ARP processes from raw wire to finished fasteners are conducted in-house, right here in the USA. The company continually improves its processes with strict quality control guidelines and is dedicated to producing products that are second to none. Simply put, ARP Bolts are better than the competition because of their quality materials and advanced processes. 

ARP prides itself on using only top-quality materials that are above the usual “aerospace-grade” quality that other manufacturers settle for. For example, while 8740 Chromoly steel has four different grades, ARP only uses the top two, SDF and CHQ. These grades cost twice as much as the lower commercial and aircraft grades, but deliver “zero defect” quality that you can trust each and every time.

ARP Bolts are built to withstand serious racing, possess greater tensile strengths, and can survive higher stress levels than most aircraft fasteners. ARP is dedicated to creating fasteners that boast ultimate strength and durability to ensure they last race after race. Its product lineup ranges from quality high-performance OEM parts to exotic specialty hardware for IndyCar, NASCAR, NHRA drag racing, Formula 1, and even marine applications.

Equip Your Ride with ARP Bolts at Vivid Racing

If you are looking to change the fasteners on your car, you’ve come to the right place. No other brand beats out ARP Bolts in terms of strength, quality, and race-proven success. Vivid Racing is, therefore, proud to carry an extensive lineup of products from American Racing Products like bolts, fluids, sealants, hand tools, stud kits, piston sleeves, wheel bolts, and more! If you have any questions regarding the parts above, please call our specialized sales team at (480) 966-3040.

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