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800-826-3045
THE COMPANY
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.
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.”
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.
A series of CNC-threading machines are employed by ARP to accurately tap the threads in
nuts. Tolerances held are better than aerospace standards.
Heat-treating is critically important in obtaining the correct tensile strength.
Fasteners are placed in special vertical racks to ensure complete 360˚ penetration.
