7 |
|
din 6916 - 1989
round washers for high-tensile structural bolting
|
|
8 |
|
gb /t 1230 - 2006
high strength plain washers for steel structural
|
|
9 |
|
tb /t 1495.4 - 1992
|
|
10 |
|
iso 7415 - 1984
plain washers for high-strength structural bolting,hardened and tempered
|
|
11 |
|
cns 4649 - 1978
hardened plain washers
|
|
|