... "-1/2" bolt Washer style:internal tooth Features:AISI B18.21.1 SUS410 internal tooth washer StandardDIN137, DIN 6797. DIN6798, ANSI ... B 18.21.1 Material C1010-C1022, 65Mn, stainless steel A2, A4 grade ... : www.dgchuanghe.comWebsite:www.dgchuanghe.cnSKYPE:fred06131QQ:498161614 AISI B18.21.1 SUS410 internal tooth washer