... STANDARD:DIN,ASME/ANSI,BSW,JIS Our mostly products are stainless steel standard fasteners, you can choose mainly materials between 200, 201,202 ... , 304 , 316Our mostly products are stainless steel standard fasteners, you can choose mainly materials between 200, 201,202, 304 ... nuts, nylon lock nuts, flat washers, spring washers etc. CSK SELF- TAPPING SCREW