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What are the specifications, models and presentation methods of the bolts
Date：May 3rd,2023
Bolts are often used in hardware fasteners, but there are many kinds of bolt sizes, the bolts used in different areas are different, if the bolts are too big or too small will not be used. So what are the specifications and models of the bolts? How does it mean it? Let's take a look at it anytime soon.1. The specifications and models of the bolts are generally indicated by the letters "M", including M6, M8, M10, M12, M14, M16, M18, M20, etc. Take M 16-5g6g as an example, it means that the nominal diameter of ordinary thread is 16cm, right rotation, tolerance band middle diameter of 5g and large diameter of 6g. If it is M161 LH-6G, it represents fine tooth thread, nominal diameter is 16, pitch is 1cm, left rotation, large diameter is 6G, the rotation length is considered according to the medium length.2. 1. According to the force situation, there are ordinary bolts and bolts for hinge holes.2, according to the shape of the head, can be divided into hexagonal, square, round, and sinking head..., the hexagonal horn belongs to the more common bolt.3, according to the thread tooth type is divided into thick teeth, fine teeth two kinds.4. According to the performance grade of bolts, it can be divided into 3.6,4.8,5.6,8.8,10.9 and 12.9, etc. Those above 8.8 belong to low carbon alloy steel bolts, with high strength, while those below 8.8 are considered as ordinary bolts.5, according to the accuracy of bolts is divided into three levels, respectively A, B, C, belongs to the refined bolt, often used in the lathe processing, the general performance grade is 8.8, C belongs to the rough bolt, grade 4.8, often used in temporary fixation.