effort and resources to develop ARP Ultra-Torque Fastener Lubricant™ . It ’ s far superior to oil , moly , EPL , in consistency and laboratory-proven to deliver 95-100 % of the desired preload on the first , and all subsequent pulls on the torque wrench .
It ’ s important to understand that the metal used in manufacturing fasteners comes in four grades : commercial , aircraft , CHQ , and SDF ( seamless , defect free ). ARP employs only the two best – which are far superior to “ aircraft ” quality . Another metallurgical factor of importance is the alloy . For critical engine fasteners , like head and main studs / bolts and connecting rod bolts , ARP uses five types of alloys ( 8740 chrome moly , ARP2000™ , Custom Age 625 +, L19 , and ARP
3.5™ ) which range from a 200,000 psi nominal tensile strength to 280,000 psi . Accordingly , you can get fasteners suited for applications that range from a normally aspirated gas-burning engine to a supercharged nitro-guzzler .
There is also much to be said on how a fastener is manufactured . ARP does its own heat-treating in-house , with studs placed in racks – not thrown into a bin – to assure accurate through-hardening . Threads are rolled ( not cut ) after heat-treating to provide vastly superior fatigue strength and meet AS8879D specifications to ensure the best possible thread engagement . All operations are the best possible – not the cheapest .
Over the years ARP has developed some 5,500-
plus fastener kits that cover everything from an old flathead Ford to the latest Chevy LS / LT , Ford Coyote and Godzilla , and Chrysler Gen III Hemi applications . The company manufactures a wide variety of accessory bolts and studs that are made from polished stainless steel or black oxide finished 8740 chrome moly . Both are nominally rated at 180,000 psi tensile strength – fully 20 % stronger than Grade 8 hardware .
For additional information , visit www . ARPbolts . com . A free copy of the latest catalog – which includes over three dozen pages of valuable tech information – is available upon request . Personalized tech assistance can be obtained by calling 800-826-3045 . DI
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