Chinese Standard: GB/T 923-2009

Acorn hexagon nuts

本标准规定了螺纹规格为M4～M24、性能等级为6、A1-50、CU3或CU6级、产品等级为A级和B级的六角盖形螺母。A级用于D≤16 mm；B级用于D＞16 mm的螺母。

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