What types of bolts are generally divided into
Release time：
2023-06-30
1. Divided according to the connection force mode
There are different types of bolts for connecting forces, mainly divided into ordinary bolts and bolts for reaming holes.
2. Divided by head shape
There are also many head shapes of bolts, such as hexagonal head, square head, round head, and countersunk head, among which hexagonal head is relatively common.
3. According to the tooth shape of the thread
There are two main types of bolt threads: coarse and fine.
4. By performance Elo rating system
There are eight performance levels for bolts, namely 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, and 12.9. High strength bolts of low-carbon alloy steel are used for bolts above grade 8.8, while ordinary bolts are used for bolts below grade 8.8.
5. Classified by production accuracy
Bolts with different production accuracy are mainly divided into three levels: A, B, and C. A and B are refined bolts mainly used for lathe processing, with a general performance level of 8.8. C is rough bolts, with a performance level of only 4.8, mostly used for temporary fixation.
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