It is very important to select the type, accuracy, and grade of the appropriate screw screw, which is related to the performance of the finished product, viewing the United States, and high quality.
Hardware screws
Choose according to the different characteristics of hardware screws. According to the purpose and role of the screw screw, it is used in various fields such as industrial products. According to all aspects of product requirements. There are many kinds of hardware screws and their characteristics are different. There are many specialized production companies. First, we must understand the production and quality of domestic fasteners, such as the types of fasteners produced, specifications and special applications of various products, as well as Guoyou products, brand-name new products of key enterprises or new, excellent, and special products, these products should be given priority, while preference should be given to the use of name, excellent new and special fastener products.
But there are a variety of categories according to the twelve major categories, should be based on the characteristics of fasteners selection, small fasteners, more than 400 varieties, only bolts, screws, there are 32 small categories There are also 10 types of end types for 100 varieties.
Head size, pan head, head with a slot, etc., easy to tool twisting, and more for low-intensity, low application torque torque products, generally used in household appliances and other small size of the host product.
This type of product is also equipped with a table, with holes, with bosses, with a flange face shape workers, hexagonal head. This type does not have high mechanical properties. It is easy to tighten the wrench, can apply a larger tightening torque, a wide range of applications, the bearing surface with convex or flange surface, with a gasket effect, increase the pressure surface, there are more Good anti-loose performance can be used for the connection of steel structures and important host structures.
Head area, square head. Easy to tighten and rotate the wrench, can apply a large tightening torque, but not easy to screw bald, used for relatively coarse, often disassembled structure, but should not be used for moving parts.