汽缸螺栓 × 汽缸螺栓 立即询问产品 加入询问清单 详细规格及用途描述 All A-Power cylinder head bolts are produced using Multi-stage cold forged machine with standard of 10. 9 Grade HRC 32-38. Our finished cylinder head bolts are normally made with Black oxide or according to OE standards.
