American self tapping screw standard
American national standard self-tapping screw products in recent years, great changes have taken place: its independent status, self tapping screw product standard of the original code ASME BI86.4 was cancelled, self-tapping screw product standards and machine screw products are combined to use the same standard code ASME BI8.6.3, standard is the name of "machine screws, self-tapping screws and metal drive screw", namely the self-tapping screw, machine screw, wood screw, thumb screw (refers to the rotating screw) and airfoil screw and combination screw referred to "screw", merged in a standard.
As for the standards concerning mechanical properties and working properties of self-tapping screws, the American society of automotive engineers has formulated three standards, SAE1933, SAE178 and SAE81. The American industry fastener association has developed TF13- standards; ASTM c 954, ASTM C1002, and ASTM C1513 have been developed by the American society for materials and testing machines. The above seven standards introduce the mechanical properties of four products, such as ordinary self-tapping screws, self-cutting self-tapping screws, self-extruding self-tapping screws and self-drilling self-tapping screws. The three SAE standards are more systematic and complete with distinct levels. So this book will recommend and introduce these three criteria to readers.
In order to fully and realistically reflect the self - tapping screw, as an important member of the fastener system, or as a large category of the fastener system. Self-tapping screw standards (including common self-tapping screw, self-cutting self-tapping screw, self-extrusion self-tapping screw and self-drilling self-tapping screw product standards and mechanical properties, performance standards) are also an important part of the fastener standard system.
Self - tapping screw is a very important type of fastener. Tapping screws and machine screws belong to two completely different products. Self-tapping screws are a special type of fastener that is only about a hundred years old and is still developing. Self-tapping screws belong to a relatively large category in various fasteners. This category is not only larger in scope and scope, but is still evolving. That is to say, belong to the product of self-tapping screw category, still be in ceaseless increase, in change. Self-tapping screw is a category or the floorboard of the categories of products, including: ordinary self tapping screw, self-tapping screw thread forming), since the self tapping screw cutting (thread cutting self tapping screw), since the self tapping screw, self-tapping screw, or called the self-tapping screw thread rolling system), self-drilling screw with tapping screw, metal drive screw (storm bolt), etc., and appear in the recent 20 years the wallboard self-tapping screw (dry wall screw, fiber board screw, chipboard screw, etc
Self-tapping screw is a kind of fastener with high strength (compared with wood screw), single piece, monomer, single side assembly and connection. It is a unique fastener with both tapping and fastening functions. Since the tapping screw can form or cut out the thread connected with itself, it has a good connection and can prevent the screw from loosening in use. In addition, self-tapping screws can be removed and can be reused again or more times. Self-tapping screw size screw type, head shape, screwing structure and performance characteristics, all kinds, almost can meet a variety of engineering requirements for the application of small size screw.
