Founded in 1968 by racing enthusiast Gary Holzapfel, ARP (Automotive Racing Products) set out to solve a critical need: fasteners strong enough for high-stress engine and motorsport use. Starting in a garage, ARP has grown into a multi-facility powerhouse in Southern California, handling everything in‑house—from forging, machining, heat-treating, and thread-rolling, to rigorous quality control and packaging.

With thousands of part numbers covering engine, driveline, suspension, and chassis applications, ARP fasteners are trusted in Formula 1, IndyCar, NASCAR, NHRA, land-speed racing, and street builds. Their factory tour—covered by Hagerty, MotorTrend, and EngineLabs—highlights their meticulous “chocolate cookie recipe” for quality: premium raw materials, precise forging, heat treatment, rolled threads, and destructive testing for every batch.

ARP’s commitment to “zero-defects” and full control of the manufacturing process makes them the gold standard in performance fasteners.