Self-drilling screws have many different head shapes, and many people don’t know that the different head shapes have different functions. Among the internationally recognized Self-drilling screws head types, there are several commonly used head types, each of which has different functions:

1. Flat head: a new design that can replace the round head and mushroom head. The head has a low diameter and a large diameter. There are slight differences in type.

2. Round head: It was the most commonly used head shape in the past.

3. Pan head: The diameter of the standard flat dome column head is smaller than that of the round head, but it is relatively high due to the relationship between the groove depth. The smaller diameter increases the pressure acting on a small area, which can be tightly combined with the flange and increase the height. surface layer. They can be successfully used in internally drilled cavities due to the head placement in the drilling die set to ensure centralization.

4. Truss head: because the head is inscribed and the wear on the wire components is weakened, it is most commonly used in electrical appliances and tape recorders, and provides a more effective bearing surface for the middle and lower head type. Attractive design type.

5. Large round head: Also called an oval-top wide-brimmed head, it is a low-profile, cleverly designed large-diameter head. Can be used to cover sheet metal holes with larger diameters when the combined tolerances of additional actions allow. It is also recommended to use a flat head instead.

6. Hexagon socket head: a knot with a wrench head height and a hexagonal head size. The hexagonal shape is completely cold-formed with a reverse-hole mold, and there is an obvious depression at the top of the head.

7. Hexagon washer head: It is like the standard hexagonal hole-bearing head type, but at the same time, there is a washer surface at the base of the head to protect the completion of the assembly and prevent the wrench from being damaged. Sometimes the function of something is more important than the appearance.

8. Hexagona head: This is a standard type in which torque acts on the hexagonal head. It has the characteristic of trimming sharp corners to close to the tolerance range. Recommended for general commercial use and available in a variety of standard patterns and thread diameters. Because of the necessary second process, it is more expensive than ordinary hexagonal sockets.

9. Countersunk head: the standard angle is 80~82 degrees, which is used for fasteners whose surfaces need to be tightly bonded. The bearing area provides good centrality.

10. Oblate countersunk head: This head shape is similar to the standard flat-top countersunk head, but it is more widely used. In addition, a rounded and neat upper surface is also more attractive in design.

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