2014 ARP Catalog

Following the basic shaping, material is heat-treated to desired levels. This crucial process is done entirely in-house to assure total quality control. ARP uses special vertical racks to hold each piece individually and assure complete 360° pen- etration. This is far superior to commonly-used methods of dumping items into a large bin and batch-treating. Studs are centerless ground to guarantee concentricity. The thread rolling operation (to MIL-S-8879A specs) is done after heat-treat, which accounts for a fatigue strength up to twenty times higher than fasteners which are threaded prior to heat-treat. ARP manufactures nuts in a multi-step process that begins with raw material being fed into a giant forming device that “blanks” the hex and 12-point nuts and continues with highly sophisticated automated threading equipment tapping each nut with an accuracy of .001˝ (which is five times higher than the aerospace standard). This ensures an exceptionally close- tolerance fit between the bolt/stud and nut. Metal finishing is also performed in-house at ARP. Operations include black oxide coating of chrome moly or polishing stainless steel to a brilliant luster.

The Grinding Department is where all studs are centerless ground to ensure that they are perfectly concentric. As many as ten machining steps are required to achieve this level of accuracy.

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Powerful cold-forging equipment is used to make ARP’s hex and 12-point nuts. Multi-stage dies are employed to precision-form the finished “blanks.”

A series of CNC-threading machines are employed by ARP to accurately tap the threads in nuts. Tolerances held are better than aerospace standards.

ARP performs the thread rolling operation after heat-treating, which results in a fatigue strength up to 20 times higher than fasten- ers with threads rolled prior to heat-treatment.

Heat-treating is critically important in obtaining the correct tensile strength. Fasteners are placed in special vertical racks to ensure complete 360˚ penetration.

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