双头螺栓
DIN 835/ 938/ 939/
940/ 975/ 976-1
ASTM A193/ 193M/ 320/
320M/ A453/ A453M/
A182/ A182M/ A276/ A479
GOST 9066-75
GB 897/ 593
JIS B222
B6, B7, B7M, B8, B8M, B8T, B8C...
L7, L7, L43
660A, 660B, 660D
31803, 32760
ISO 898-1, ISO 3506-1
BG 3098-1
JIS B1051
M2~M72