What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
In the prior art, the spring washer has a certain anti-loosening effect. However, due to the unreasonable design structure, the upper and lower pressing forces of the spring washer and the spring washer's anti-return force are poorly matched, resulting in the smooth surface and the bolt head. The friction between the nut and the connected parts is small. When the bolt or nut is subjected to strong vibration, the bolt or nut will still loosen. Therefore, the anti-loosening effect of the above spring washer still needs to be improved.
Before the special vehicle is refitted, the chassis and the car frame should be reinforced again, and the fastened part of the rivets should be disassembled before the car frame is reinforced.
GB bolts are generally divided into two types: GB30 bolts and GB21 bolts. The difference is that the hexagonal head of GB30 is larger than that of GB21. The materials are all used: Q235. The grade is 4.8, the hardness is weak, and it is used for parts with low hardness requirements and infrequent activities, which are called ordinary bolts. The most typical use: machinery, construction, fixing, fastening.
Guangdong Yueluo Hardware Industry Co., Ltd. discloses a low-carbon steel rivet nut fastened to a thin-walled and thin-plate fastener. The rivet nut fastener is composed of a brim, a deformed skirt, and a threaded hole. Using low carbon steel cold extrusion, the brim is formed by cold heading, the deformed skirt is extruded in the concave die, and the thread hole of the nut tapping skirt is extruded at the lower end of the deformed skirt. It is characterized in that there are fish teeth under the brim; the outer side of the lower end of the threaded hole has a lead angle; the cross-section of the thread of the inner wall of the threaded hole is an isosceles trapezoid, and the upper bottom of the trapezoid is a concave solitary shape, and the fastener does not need to be welded. , Single-sided riveting, easy operation and firm connection.
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