stainless steel 201,304,316,B8,B8M hex nuts and heavy nuts! Our mostly products ... stainless steel standard fasteners, you can choose mainly materials between 200, 201,202, 304 , 316(A2, A4), 304L, 316L ... (threaded studs), anchor bolts, U-bolts; Carriage bolts, hex bolts & hex nuts, heavy nuts, nylon lock nuts, flat washers, ... product, and environment engineering. stainless steel heavy nuts & hex nuts