One end of the fastener is formed into a bearing surface formed by an enlarged portion. The so-called bearing surface refers to the part that supports or locates the joint, and usually the bearing is used to load and unload the screw. There are two basic types of bearing surface, the flat bearing surface (perpendicular to the knot part) and the tapered bearing surface (forming the angle with the knot part). In most cases, the service is to withstand the load force acting on the knot. In addition to continuing the same function of the flat bearing, the latter can also be used for positioning. Shenyang fasteners with tapered bearing faces are usually referred to as countersunk heads. The different applications of the head shape depend initially on the function of the deck and the ability of the head to transmit torque.
Bolts and bolts of common flat bearing surfaces are different head type:
Flat head: a new design that can replace the round head and the mushroom head. The head has a low diameter and a high peripheral edge on the outer circumference of the head, which makes it play a role in high-intensity torque, and the head shape in terms of head shape. There are minor differences.
Round head: It is the most commonly used head shape in the past.
Top column head: The standard flat dome head has a smaller diameter than the round head, but it is relatively high due to the groove depth. The smaller diameter increases the pressure acting on the small area and can be tightly combined with the flange and the raised surface. . Since they are used in the drilling molds provided for the purpose of ensuring concentration, they can be successfully applied to the holes of the inner drilling.
The wide-width head of the dome: due to the incision under the head and the weakening of the wear on the wire components, it is most commonly used in electrical appliances and tape recorders, providing a medium-lower head with a more attractive bearing surface. Type of design.
Big round head: also known as the elliptical top wide side head, is a low-profile, cleverly designed large-diameter head. It can be used to cover metal plate holes with larger diameters when combined tolerances for additional action allow. It is also advisable to use a flat head instead.
Slotted head type: This is a creative anti-loose type. Once the combination is not easy to remove, it can be started with a standard standard screwdriver. This simple design can often solve the cost problem in the portfolio, increase the number of production, and create amazing economic benefits for the manufacturing process.
Hexagon socket head: A knot with a wrench head height and a hexagonal head size. The hexagon is completely formed by the cold mold of the counter hole, and there is a distinct depression at the top of the head.
Hexagon socket hole Huasi head: such as the standard hexagon socket head shape, but at the same time there is a Huasi surface on the head base to protect the assembly, so as not to damage the wrench. Sometimes the role of things is far more important than the appearance.
Hex Head: This is a standard type of torque applied to the hex head, which has the ability to trim sharp sharp corners to near tolerance. Can be recommended for general commercial use, as well as for a variety of standard modes and various thread diameters. Because of its necessary second process, it is more expensive than the general hexagonal hole.
The socket head: There is a deep hexagonal socket in the head of the cylinder, and the CapScrew with a high-strength socket head is common. The deeper acupoints cause a high torque to act on the knot.