ARP AU6.150-1B Universal Metric Stud 12mm x 1.50 / 12mm x 1.25 Thread 6.150 in. Chromoly Black Oxide

The ARP AU6.150-1B is a universal metric individual stud featuring 12mm x 1.50 base threads and 12mm x 1.25 top threads with an overall length of 6.150 inches. Constructed from premium 8740 chromoly steel and finished in black oxide, this stud is engineered to the same exacting standards as ARP's full stud kits, making it an ideal replacement for lost or out-of-spec studs in cylinder head, main cap, or other engine fastener applications.

Key Features:

• Material: 8740 chromoly steel rated at 180,000 PSI tensile strength
• Base thread: M12 x 1.50
• Top thread: M12 x 1.25
• Overall length: 6.150 inches
• Broached Allen hex drive end for easy installation and removal
• Precision centerless-ground for concentricity and straightness
• Threads rolled after heat-treat to Mil-S-8879 specifications for superior fatigue strength
• Black oxide finish for corrosion resistance
• Sold individually
• Nuts and washers sold separately

ARP individual studs undergo the same rigorous manufacturing process as complete ARP stud kits. Each stud is precision centerless-ground and thread-rolled after heat-treatment, a process that delivers significantly better fatigue strength compared to studs threaded prior to heat-treat. The broached end allows for easy installation with a standard Allen wrench.