1,OEM 2,Raw material: 40Cr. 35K 45# 3,certificate: ISO9001-2008 4, ... elliptical neck.Both types are manufactured to A.R.E..A. and A.S.T.M.,and A-183 specifications. Bolts are furnished with rolled ... treatment: Nuture, black, pot galvanizing, cold galvanizing, oil, parkerising etc.2. Grade: 5.6, 8.8, 10.6 and12.93. Dia ...