... :1/2''-1.1/8'' & M12 -- M36 3.mechanical grade:8.8/10.9/12.9 4.case hardening:HRC38-HRC42 raw material40Cr,35CrMosize1/2''--1.1 ... bolts, eye bolts, U bolts, masonry bolts, roofing bolts.Nuts: spring nuts, T nuts, K nuts, rivet nuts, cage nuts, lock ... nuts, weld nuts, square nuts, cap nuts.Washers: flat washers, spring washers, lock washers, structural Washers. square washer, bowl washer.Screws ...