5 800-826-3045 THE COMPANY The Manufacturing Process… In order to ensure optimum quality control, ARP has grown to be exceptionally self-reliant and now controls all aspects of the manufacturing process. All operations are per- formed in-house and closely monitored. This is how ARP has been able to establish a reputation for “zero defects” quality throughout the industry. The process begins right at the mill, where ARP orders only premium grade materials including several proprietary alloys. The ever-popular 8740 chrome moly steel, for exam- ple, comes from the mill in four distinct grades. The lowest is “commercial,” which is followed by “aircraft quality.” ARP uses only the top two grades (SDF and CHQ), which cost twice as much, but provide the foundation for defect-free fasteners. These materials come in bar stock (for studs) and huge coils (for bolts). Transforming raw material into a fastener begins with “hot” and “cold” heading processes. Material is fed into pow- erful devices and cold forged, or induction-heated and formed under tons of pressure. An overview of part of ARP’s expansive machining operations. The shop is laid out for optimum efficiency. Some bolts begin as induction-heated lengths of bar stock that are forged on huge presses with the desired head shape. Material comes from the mill in large coils...which subsequently will be fed into cold-headers and formed into bolts. ARP’s bank of cold-headers can handle material up to 5/8˝ diameter and form bolts in a multi-phase operation. Lengths of bar stock are automatically fed into special machines and cut to the appropriate length.