377 bolt (screw, nut, stud, spring washer, pin, ball bearing, roller bearing) is the most commonly used machine part.
377 bolt (screw, nut, stud, spring washer, pin, ball bearing, roller bearing) is the most commonly used machine part.
螺栓（螺钉、螺帽、双头螺栓、弹簧垫圈、销、滚珠轴承、滚柱轴承）是最常用的机械零件。