Bolts are often used in hardware fasteners, but there are many sizes of bolts, and different regions use different bolts. If the bolt is too large or too small, it cannot be used. What are the specifications and modeling methods of bolts? Let’s take a look at the relevant knowledge immediately.
One, Specifications and Modeling Methods of Bolts
The specifications and modeling of bolts are generally represented by the letter “M”. The specifications are M6, M8, M10, M12, M14, M16, M18, M20, etc. For example, M 16-5g6g means that the nominal diameter of the common thread is 16cm, right-handed, the middle diameter tolerance is 5g, and the outer diameter tolerance is 6g. If it is M16×1 LH-6G, it represents fine thread, the nominal diameter is 16, the pitch is 1cm, left-handed, and the outer diameter tolerance is 6G. The thread engagement length is considered medium length.
Two, Types of Bolts
1. According to the load situation, there are ordinary bolts and tapped hole bolts.
2. According to the shape of the head, it can be divided into square, round, conical, and sunken heads, etc. Among them, the hexagonal head is a relatively common bolt.
3. According to the thread tooth shape, it can be divided into coarse thread and fine thread.
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. 8.8 grade and above belong to low-carbon alloy steel bolt, with high strength, while 8.8 grade and below are considered ordinary bolts.
5. According to the precision of bolt manufacturing, it can be divided into three levels, namely A, B, and C, which are precision bolts often used in lathe processing, with a performance grade of 8.8, C is a rough bolts, with a performance grade of 4.8, often used for temporary fixing.
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Post time: Nov-26-2024
