fly-headed screw 蝶形头螺钉

fly headed screw 翼形螺钉 ; 蝶形头螺钉

mill headed screw 滚花头螺钉

flat-headed screw 平头螺钉

square headed screw 方头螺钉

button-headed screw 半圆头螺钉

round-headed screw 圆头螺钉

button headed screw [机] 半圆头螺钉

lentil-headed screw 扁头螺钉