snap head machine screw 半圆头机器螺丝

countersunk head machine screw 埋头机螺钉

round head machine screw 圆头机器螺丝

flat head machine screw 平头机器螺丝

raised head machine screw 突头机器螺钉

ap head machine screw 半圆头机器螺丝

hexagon head machine screw 六角小螺钉

round d head machine screw 圆头机器螺丝

cross recessed head machine screw 十字槽头螺钉

screw head slotting machine 螺钉头开槽机