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根据ＧＢ/Ｔ 30 98 1(等同采用ＩＳＯ 898- 1)和ＧＢ/Ｔ 30 98 2 (等同采用ＩＳＯ 9898- 2 )紧固件机械性能标准的规定 ,对所有性能等级的六角头螺栓和六角螺母以及内六角螺钉等 ,螺长直径大于或等于 5ｍｍ的紧固件产品上必须制出制造者 (或经销者 )的识别标志。全国紧固件标准
Hexagon head bolts and hex nuts, of all performance classes, are to be complied with according to the mechanical performance standards of fasteners GB / T 30 981 (ISO 898-1 equivalent) and GB / T 30 982 (ISO 9898-2 equivalent) And hexagon socket head cap screws, etc. The identification mark of the manufacturer (or distributor) must be made on the fastener products with a screw length greater than or equal to 5mm. National Fastener Standard