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Part number: 155-5421
Product Details
ARP 155-5421 Main Cap Fasteners
Products specifications
Fastener Nut Style Standard 12-point
Fastener Style Stud
Fastener Yield Strength (psi) 200,000 psi
Main Bolt Style 2-bolt
Nuts Included Yes
Quantity Sold as a kit.
Washers Included Yes
Works with Windage Tray No
Main Stud Kit
2Bolt Main
12Point Head

Main Studs
There are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.

Main Bolts
Far superior to any other main bolt kit offered for use in competition engines, ARP main bolts are designed to meet the exacting standards and demands of professional engine builders. Forged from 8740 chrome moly, all bolts feature generous under-head radius and rolled threads for the utmost reliability. The threads are rolled after heat-treating, which makes them about 1000% longer fatigue life than most main bolts, which are threaded prior to heat-treating. Available in the popular High Performance Series, which, at a nominal rating of 180,000 psi, is a premium replacement for OEM fasteners, or the 200,000 psi nominal rated Pro Series, application-specific main bolts with reduced wrenching head and are designed for use in competition applications. Parallel-ground, hardened washers are included with each kit.

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Best price around. Great Communication. Fast shipping. What else can I ask for?
I have already purchased again from them.
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Best pricing I found anywhere on the part I needed, quick shipping, no hassle. Definitely going to be a repeat customer.
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Very fast shipping, lowest prices on the web.
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