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What are the specifications and representations of bolts?

  • Author:Gary Young
  • Source:baidu
  • Release on:2024-04-01
Bolts are often used in hardware fasteners, but there are a variety of bolt sizes, different areas use different bolts, if the bolt is too large or too small will not be able to use. So what are the bolt sizes? How is it expressed? Let's take a look at the relevant knowledge right away.

First, the specification model of the bolt and the method of expression
Bolt specifications generally use the letter "M", the specifications are M6, M8, M10, M12, M14, M16, M18, M20 and so on. M 16-5g6g as an example, it means that the nominal diameter of the ordinary thread is 16cm, right-handed, tolerance band 5g, large diameter of 6g means. If it is M16×1 LH-6G, it means fine thread, nominal diameter is 16, pitch 1cm, left-handed, large diameter is 6G, and the screwing length is considered according to the medium length.

Second, what are the types of bolts
1、According to the force, there are common bolts and bolts for reamed holes.
2, according to the head shape, can be divided into hexagonal, square, round, and countersunk head ...... of which hexagonal belongs to the more common bolts.

3, according to the thread type is divided into coarse teeth, fine teeth.
4, according to the performance level of the bolt can be divided into 3.6, 4.8, 5.6, 8.8, 10.9 and 12.9, etc., 8.8 level above belongs to the low carbon alloy steel bolts, with high strength, and 8.8 level below the ordinary bolts.
5, according to the bolt production accuracy is divided into three levels, respectively, A, B, C, belongs to the refined bolt, often used in lathe processing, general performance level of 8.8, C belongs to the crude bolt, grade 4.8, often used in temporary fixing.

Article Conclusion: Off the bolt specification model and representation and type, it is introduced to you here, I hope to help you. Although the size of the bolt is relatively small, but hidden big energy.

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