Qib kev ua tau zoo ntawm bolts siv rau kev sib txuas steel qauv yog 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 thiab lwm yam. Bolts ntawm qib 8.8 thiab siab dua yog ua los ntawm cov pa roj carbon tsawg lossis cov pa roj carbon nruab nrab thiab cov cua sov kho (quenched, tempered), uas feem ntau hu ua siab zog bolts ...
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