... not easy to distort, is made of high intensity alloy plank, and it is once formed by 1200T oil ... was processed by digital controlled lathe, is made of alloy material. The bearing position is processed by the method of ... easy to distort.8.HJ type bolt is made of alloy material, which has the capability of high intensity, well ... Brake shoe and other spare parts.3,BPW standard. T-30 brake air chamber