... 椭圆螺栓孔 elliptic bolt hole 半圆头螺栓 ahead bolt; ball headed bolt; ball stud; button headed bolt; button-headed bolt; cup head bolt; cup-headed bolt; half-round screw; snap head bolt; snap-head bolt 半圆沉头螺栓 half round countersunk head bolt ...
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half-round head screw 半圆头螺钉 ; 半圆头螺丝
metal screw with half-round head 金属半圆头螺钉 ; 金属圆头螺钉
half-round wood screw 半圆头木螺丝
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