There are many different head types of drill tail self-tapping screws, and many people do not know that the head types are different, and their functions are also different. There are several commonly used head types in the internationally recognized drill tail self-tapping screw head types, and they each have different functions:
1. Flat head: a new design that can replace the round head and the mushroom head, the head has a low diameter and a large diameter, and the peripheral circumference of the head is connected to the high-profile edge that expresses the characteristics, so that it can drive high-intensity torque, and the hole is in the head. There are slight differences in type.
2. Round head: It is the most commonly used head shape in the past.
3. Top column 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 depth of the groove. The smaller diameter increases the pressure acting on a small area, which can be closely combined with the flange and heightened. surface layer. They can be successfully used in the pockets of the internal drilled holes because they are headed in the drilled dies provided to ensure concentration.
4. Dome wide-brimmed head: Because the incision under the head restrains and weakens the wear and tear of the wire components, it is most commonly used in electrical appliances and tape recorders, providing more advantages for the medium-low head type with its sufficient bearing surface. Attractive design type.
5. Large round head: also known as oval top wide-side head, it is a low-profile, ingeniously designed large-diameter head. Can be used to cover sheet metal holes with larger diameters when the combined tolerance of the additional action allows. It is also recommended to use a flat head instead.
6. Hexagon socket head: a joint with the height of the wrench head and the size of the hexagonal head. The hexagon is completely cold-formed by a reverse-hole mold, with a distinct depression at the top of the head.
7. Hexagon socket socket head: such as the standard hexagon socket socket head, but at the same time there is a washer face on the base of the head to protect the completion of the assembly, so as not to damage the wrench. Sometimes how things work is more important than how they look.
8. Hexagon head: This is a standard type of torque applied to the hex head, which has the characteristics of trimming sharp sharp corners to close to the tolerance range. It can be recommended for general commercial use and is also available in a variety of standard patterns and thread diameters. It is more expensive than ordinary hexagonal sockets because of the necessary second process.
9. Flat top countersunk head: The standard angle is 80~82 degrees, which is used for fasteners that need to be tightly joined on the surface. The face portion provides good centrality.
10. Oblate countersunk head:
This head type is similar to the standard flat top countersunk head, but is more widely used. In addition, a round and neat upper surface is also more attractive in design.
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