Screws can be divided into
Machine screw, self tapping screw, drilling tail screw, wallboard screw, fiberboard screw, wood screw, hexagonal wood screw, non pulling screw, combination screw, micro screw, furniture screw, electronic screw
According to the head type, it can be divided into
1. Hexagon head 2. Hexagon head with flange 3. Square head 4. T head (hammer head) 5. Mushroom head (truss head) 6. Cheese head 7. Round head 8. Pan head 9. Countersunk head (flat head) 10. Raised countersunk head (oval head)
According to the groove type, it can be divided into
1. Philippe 2. 10 / word 3. Word 4. Inner triangle 5. Inner corner square 6. Cross 7. Meter character 8. Flower shape 9. Plum blossom shape 10. Flower shape 1. Special shape 12. Inner hexagon