... .8,10.9,12.9 Torshear type high strength nut and bolt washer for steel structures I ... Sudelan Railway Parts Co., Ltd.) is specializing in producing railway fasteners. We have certified by ... ISO9001:2008 Quality Management System and got the Production Permission License from the ... , Cuba, Germany, Japan, Singapore, Malaysia and Africa and so on. Pictures:1.certificates 2.ProductsBolts with ...