Alright, let’s talk about the ARP Ring Square Tool, model 902-9400. If you’re diving into some serious diesel work, you’re going to want this tool in your kit. ARP has been in the game since 1968, and they know a thing or two about fasteners. This tool is designed specifically to help you get a square fit when you’re dealing with head studs and bolts, which is crucial for making sure everything holds up under those extreme loads.
Now, here’s the deal: this tool measures between 94mm and 100mm, which is perfect for a range of diesel applications. It’s not just about having the right parts; it’s about how you put them together. That’s where the Ring Square Tool shines. It helps you keep those pre-loads in check, making sure that when you’re tightening things down, you’ve got everything lined up just right. Trust me, you don’t want to be messing around with misaligned fasteners when you’re pushing your rig to the max.
What’s cool is that ARP has really beefed up their designs over the years. These fasteners are stronger than ever, so you can count on them to handle the heavy loads without breaking a sweat. Whether you’re wrenching on a daily driver or a full-on race machine, this tool is going to help you get the job done right.
So, if you’re serious about your diesel setup and want to ensure everything is locked in tight, grab the ARP 902-9400 Ring Square Tool. It’s a straightforward, no-nonsense piece of equipment that’ll make your life a whole lot easier.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

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 RacingIf 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.