Many types of fasteners, different characteristics, there are many specialized production enterprise, we must first understand the fasteners production and quality , such as the production of fasteners species, size and variety of products for special purposes, as well as ministerial and national best products, the backbone of the enterprise brand new products or new, gifted, special products, these products should use the same priority to preferred name, excellent new, special fastener products.

Second, the principle should apply to the selection of conservation

Should be based on the characteristics of fastener selection. Fasteners may be small, but it is varied, according to the categories have 12 categories, more than 400 varieties, only the bolts, screws, there are 32 Class class nearly a hundred varieties, the end of shank 10 types one class. Such a large fastener family members, it is impossible to be introduction, should the application of the principle of conservation selection, is an example to the head type selection.

1, hex head, with such products also in Taiwan, perforated, with a boss, with a flange-shaped work, the class did not have high mechanical properties visible, easy wrench tightening, may impose a greater tightening torque, broader application, such as the bearing surface with a convex surface or flange with washer, increasing the pressure side, a better locking performance, can be used for steel structure and important connection to the host structure.

2, square head, the head area, to facilitate the wrench to tighten the turn, can be applied like large tightening torque, and easy to wring bald, used for relatively thick, often dismantling of the structure, but should not be used for moving parts.

3, pan head, head size, head slotted so easy tool applied screw, used for low-intensity, low applied screw torque products, generally used for small household appliances such as size of the host product, specifications, the MIO the following, M6 with the following for more.

 



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