hex forged bolt and nut MOQ:50PCS grade:3.6 ,4.6 ,4.8 ,5.6 ,6.8 ,8.8 ,9.8 ,10.9 ,12.9 hex forged bolt and nutThe screw ... head and ( with the outer screw thread cylinder ) is composed of two parts of a class of fasteners, and nut used ... bolt connection is detachable connection.grade:3.6 ,4.6 ,4.8 ,5.6 ,6.8 ,8.8 ,9.8 ,10.9 ,12.9 hex forged bolt and nut ...