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truss head Machine Screws with hexalobular driving
Diameter range (mm)：M2-M20，1/8-3/4Length range (mm)：3-300，1/2-12'
External hexagonal galvanized bolt can also be called external hexagonal galvanized screw, external hexagonal galvanized screw, etc. Many of these terms are all of the same meaning. They all describe the hexagonal galvanized bolts.
1. The outer hexagon galvanized bolt can be divided into three types: A, B and C. A and B bolts are special bolts, and relatively few are used. Class C is a common bolt, which is widely used.
2. In general, galvanized bolts for external bolts, Class C general bolts are usually used in some temporary connections and connections that need to be disassembled. M16, M20 and M24 general bolts are often used in building construction. In addition, there are also some bolts with large diameter, which are generally used in the field of mechanical engineering, and the main purpose is unique.
Friction and anti-loosening
Friction anti-loosening is the most widely used anti-loosening method, and it is a more widely used method. This kind of method creates the sliding friction force that can inhibit the relative rotation of the thread pair in the middle of the thread pair, and does not change with the external force. The positive pressure is achieved by clamping the threaded pair radially or simultaneously. For example, lock nuts, ductile sealing rings, double nuts and polyester insert locknuts are used. This kind of anti-loosening method can easily disassemble and disassemble the nut, but it will suffer from environmental hazards, such as pressure, vibration and variable load conditions, and the bolt will loose, resulting in the landing of the preload. With the passage of time, the missing preload will become more and more sluggish, and the nut will become loose and the thread connection will become invalid.
Mechanical equipment anti-loosening
When dealing with key connections, pins, stop washers and galvanized steel wire ropes are used. The way of preventing loosening of such mechanical equipment is more reliable.
Permanent loosening prevention
This type of method mainly adopts welding, riveting, bonding and other methods. During disassembly and assembly, most of the threaded standard parts will be broken and cannot be reused.
