The ARP main stud kit for the BMW MINI 1.6L Prince engine (N12 / N14 / N16 / N18) 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 treatment to create a fastner that has threads 2000% stronger than others.All Kits come complete with hardened parrell-grooved washers with aerospace quality nuts.
You will reduce cranshaft flex and main cap fretting with these premium quality main studs
Please note that when you change from factory fastners to high strength fastners like these, clamping forces and tolerances will change, therefore it will be necessary to check the main bearing bores for proper size and out of round condition after installation of the studs and aligh hone the cylinder block if neccesary.
The main bores should always be align honed using the same fastners and lubricant which will be installed during final engine assembly at the recommended preload.
Kit includes the following ;
ARP Ultra-torque fastner lube sachet
10 x M9 8740 chrome moly studs
10 x M9 hardened washers
10 x M9 aerospace quality nuts
18 x M6 beplate bolts