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ARP Bolts 1/2in-13 x 4.00in 12pt Black Oxide 8740 Chromoly (5/pkg) - 627-4000

Alright, gearheads, let’s talk about these ARP 1/2-inch - 13 x 4.00-inch 12-point black oxide bolts. If you're in the business of building or upgrading your ride, you know that the right fasteners can make all the difference. These bad boys are made from 8740 chromoly, which is a fancy way of saying they’re tough as nails. Seriously, with a yield strength of 180,000 psi, you can count on them to hold up under pressure.

Each bolt measures 4 inches long, with a 12-point head style that makes them a breeze to work with. You’ll need a 9/16-inch wrench to get a grip on them, which is pretty standard and should be in your toolkit already. Plus, they come with washers included, so you won’t have to hunt down those little guys separately.

These bolts are finished in black oxide, not just for looks but to help resist corrosion too. Whether you're tightening down a suspension component or securing an engine part, you want something that can handle the heat and stress. And let's be honest, nobody wants to deal with a bolt that snaps halfway through a project.

Sold in packs of five, these ARP bolts are perfect for your next build or repair. Just make sure you're using them in the right spots—they’re designed for serious applications, so don’t go thinking they’re just for any old job. If you’re aiming for a reliable setup that can handle some serious torque, these are the bolts you want in your corner.

Other Part Numbers:
ARP Bolts #arp627-4000

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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