Screws are usually used alone (sometimes with washers). They are generally used for tightening and should be screwed into the internal threads of the body.
There are many varieties due to different head and groove shapes. There are several types of heads: cheese head, pan head, countersunk head and semi-countersunk head. The head grooves have slotted, phillips and hexagon socket. The phillips screw has good neutrality when screwing, and the head strength is greater than that of the slotted type, and it is not easy to be bald. It is generally used in mass production. Hexagon socket screws can apply a large tightening torque, have a high connection strength, and the head can be embedded in the body.
Set screws are used to fix the relative position of the parts. The head has slot and hexagon socket. Slotted and hexagonal sockets are easy to sink into parts. The end of the set screw varies according to the requirements.
