Phillips round head machine thread screw is a kind of mechanical screw, the head is semi-circular with cross groove and with external thread fastener, also known as cross groove pan head screws. It is mainly used for a part with internal threaded holes, and a part with a through-hole fastening connection between the parts, do not need to nut fit, this form of connection is called screw connection, also belongs to the removable connection.

十字圆头机牙螺钉是一种机械螺钉，头部为半圆状有十字槽且带有外螺纹的紧固件，也称十字槽盘头螺钉。它主要用于一个带有内螺纹孔的零件，与一个带有通孔的零件之间的紧固连接，不需要螺母配合，这种连接形式称之为螺钉连接，也属于可拆卸连接。