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Cov Khoom Siv
Cov bolts tau txhais hauv ANSI B1.13M rau Qib 6 g kev kam rau siab. Cov khoom siv bolt yog ua raws li ASTM F568M rau Chav Kawm 4.6. Cov khoom siv rau cov bolts tiv taus corrosion yog ua raws li ASTM F 568M rau Chav Kawm 8.83. bolts. Kev kho qhov chaw yuav tsum ua raws li AASHTO M232.
