Hexagon Flange Nuts
DIN 6923 6331 6927 6926
GB/T 6177.1 6177.2 2148 6183.2 6183.1
ISO 4161 10663 7043 12125
ASME/ANSIB 18.16.3M 18.16.4 18.2.2 18.2.4.4M
JISB 1190 1199-3
CNS5055
EN 1611 14218 1663 1666
NF E 25-406 25-406-1 25-413 25-506 25-507
QC 320 338
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