镀锌钢螺栓紧固件A153

外六角镀锌钢紧固件
镀锌的螺栓螺母和垫片均由ASTM-A307标准低碳钢制成，螺栓和螺母采用美国标准尺寸，螺纹遵守美国标准粗螺纹CLASS#2，镀锌符合ASTM A153。

螺纹规格有5/16-18、3/8-16、1/2-13、5/8-11、3/4-10，各种长度供选择。
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Galvanized bolts, nuts, flatwashers, and internal tooth lockwashers are manufactured per ASTM307 Grade A. Nut surfaces and bolt heads have American Standard dimensions, and the threads are per American National Coarse Series, Class #2 fit. Galvanizing is per ASTM A153.