ARP Main Stud Kit 12PT Nut For Nissan RB25DET 2.5L & RB26DETT 2.6L Leading engine builders rely on ARP main studs. Made from 8740 chromoly steel, they have a 190,000 psi tensile-strength rating. They are precision centerless-ground and thread-rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance. Get race-ready and surpass your competition with ARP Main Stud Kit 12PT Nut! Engineered with 8740 chromoly steel, these studs provide unbeatable strength and durability with a jaw-dropping 190,000 psi tensile-strength rating. No detail is overlooked with precision centerless-ground and thread-rolled construction to Mil-S-8879 specs, topped off with a black oxide finish for ultimate corrosion resistance. Don't just settle for good enough, power your engine with the best and leave the competition in the dust.