STANDARD: ASTM A193/B7、ASTM A193/B7M ASTM A320/L7、ASTM A320/L7M、A320/B8、B8M ASTM A193/B8、ASTM A193/B8M ASTM A193/B16
Thread: ANSI/ASME B.1 2A
Material: 1）AISI4140、AISI4145 2）AISI304、AISI316 3）Cr-Mo-V Alloy steels
