Service HotlineThe main purpose of the screw is to make the industrial product form a fixed one. In use, it often happens that the teeth cannot be closely attached, the screw head will be broken if the screw is locked too hard, or the tooth pattern is not properly locked, etc., and the use conditions are not met, all of which are quality. the problem of accuracy. Screws are mass products, not handmade works of art. In mass production, the purpose is to achieve high-precision and stable quality and popular prices to supply consumers. The accuracy of screws is usually 6g, and the rough screws used in construction projects are 10g. The value of screws is very important. In the world, there are examples of automobile factories going bankrupt because of poor screw quality; there are also examples of planes falling and vehicles being overturned because of poor screw quality.
The shear strength of a metal material refers to the ability of the material to withstand shearing force, which refers to the strength of the external force perpendicular to the material axis and shearing the material. The test is usually to install the cylindrical pin into the specified fixture, and the gap between the supporting part and the loading part is required to be no more than 0.15mm, and then force is applied to test the shear strength of the material.
A low-carbon steel rivet nut fastener composed of a brim, a deformed skirt and a threaded wire hole is characterized in that there are fish teeth below the brim; the outer side of the lower end of the threaded wire hole has a chamfer; the inner wall of the threaded wire hole The cross section of the thread is an isosceles trapezoid, and the upper bottom of the trapezoid is a concave arc.
National standard lock nut GB/T 6182-2000 Type 2 non-metallic insert hexagonal lock nut. GB/T 6183.1-2000 Non-metallic insert hexagonal flange lock nuts. GB/T 6183.2-2000 Non-metallic insert hexagonal flange lock nuts - fine pitch. GB/T 6184-2000 Type 1 All-Metal Hexagon Lock Nuts. GB/T 6185.1-2000 Type 2 all-metal hexagonal lock nuts. GB/T 6185.2-2000 Type 2 all-metal hexagonal lock nuts with fine teeth. GB/T 6186-2000 Type 2 All-Metal Hexagon Lock Nuts Grade 9. GB/T 6187.1-2000 All-metal hexagonal flange lock nuts. GB/T 6187.2-2000 All-metal hexagonal flange lock nut with fine teeth. GB/T 889.1-2000 Type 1 non-metallic insert hexagon lock nuts. GB/T 889.2-2000 Type 1 non-metallic insert hexagonal lock nut fine pitch.
The middle pins on upright and horizontal pianos are also called balance pins. The middle pins are installed on the middle sleepers of the keyboard frame and play the role of fixing the keys. Generally, there are 88 keys in the piano. The pins are matched with the pin holes, and the keys are installed on each middle pin one by one through the pin holes. Due to the large number of middle pins and keys, in the production and installation process, in order to ensure the flatness of the 88 keys after installation, it is necessary to debug the middle pins and keys one by one, or add paper circles to the middle fixed part on the middle pins. The flatness of the 88 keys is kept the same. This debugging method is extremely cumbersome and increases the workload of debugging. Moreover, when adding paper circles, the keys need to be disassembled frequently. Due to the limitation of the installation space of the keys, it is troublesome to disassemble the keys, and it is easy to install and disassemble the keys many times. Damage to the pin holes on the keys, degrading the quality of the piano.
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