... 圆头开槽螺栓：round head grooved bolt 圆头方颈螺栓：round head square-neck bolt 圆头的：round-head ...
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half-round head square neck bolt 半圆头方颈螺栓
round head square neck bolt 圆头方颈螺栓
round-head short square-neck bolt 圆头短方颈螺栓
round d head square-neck bolt 圆头方颈螺栓
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