round-head bolt 圆头螺栓

round head grooved bolt 圆头槽螺栓 ; 圆头开槽螺栓 ; 圆头

slotted round-head bolt 开槽固头螺帽

round head button bolt 圆头螺栓

round head carriage bolt 圆头螺钉

half round countersunk head bolt 半圆沉头螺栓

round head square-neck bolt 圆头方颈螺栓

brass bolt with round head 圆头铜螺栓

round slotted head bolt 圆槽头螺栓