L19 is a very high strength material compared to ARP's ARP2000 and is capable of delivering a much higher clamping force suitable for force induction engines. Used primarily for short track and drag racing applications where inertia load exceeds the clamping force of ARP2000.

As a matter of fact, ARP’s customer list reads like a “who’s who” of motorsports around the world. In the past several years, virtually every major championship on the planet has been won with engines prepared by ARP customers. These include NASCAR Sprint Cup, IndyCar, Formula 1, ALMS, NHRA Top Fuel, Funny Car & Pro Stock, NASCAR Nationwide Series and Camping World Truck Series. And so it goes. ARP works closely with many, many teams as a supplier of engine and driveline fasteners, and has clearly become recognized as “the” preeminent source for serious racers.

In addition In addition to its core automotive business, ARP has an Aerospace Division, and is one of the very few companies in the world fully licensed by the United States Government to manufacture MS-21250 fatigue rated fasteners.