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ARP Bolts 1/4-28 x 0.515 Hex Stainless Steel Bolts (5/pkg) - Polished Finish - 721-0515

When it comes to upgrading your rig or tackling that next project, you want fasteners that can handle the heat—literally. These ARP 1/4-28 x 0.515 Hex Stainless Steel Bolts are just the ticket. Made from ARP Stainless 300, these bolts are not just shiny; they’re built to last. With a polished finish, they look good while being tough enough to withstand the rigors of the road.

Let’s talk specs for a second. The fastener size is 1/4-28 in. RH, and the underhead length is 0.515 inches. You’ll find that the hex head style makes them super easy to install, whether you're working in tight spaces or just want to get the job done quickly. Plus, the 5/16 inch wrench diameter means you won’t have to dig through your toolbox to find the right tool.

One of the standout features is the yield strength of 180,000 psi. That’s some serious muscle, ensuring these bolts can take a beating without breaking a sweat. And yes, they come with washers, so you won’t have to worry about making extra trips to the hardware store.

Each set includes 5 bolts, which is perfect for those small projects or repairs. Whether you’re a small business owner looking to keep your equipment running smoothly or a DIY enthusiast taking on a weekend project, these bolts are a solid choice. They’re reliable, sturdy, and ready to tackle whatever you throw at them.

Other Part Numbers:
ARP Bolts #arp721-0515

Proposition 65

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

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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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