Fastening:
Standard: ASME B1.1，ASME B1.13M，ASME B18.2.1，ASME B18.2.2，ASME B18.21.1，ASME B18.22.1，GB 3098
Size: M10~M100, 3/8 "~4"
Material:
ASTM A193 B7,B8,B8M,B16,B6,B5,B8T,B8MA
ASTM A194 2H,2HM,3,4,6,7,7M,8,8A,8M,8C,8CA,8T
ASTM A540 B21,B22,B23,B24,B24V
ASTM B150 C63000
Surface treatment：
Blacken, Zinc plating, Zn-Ni Plating,  Hot dip galvanizingXylan, Xylan coating, Zincizing