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| Thread size d | M3 | M4 | M5 | M6 | M8 | M10 | M12 | |
| h | Public | 0.5 | 0.8 | 1 | 1.6 | 1.6 | 2.0 | 2.5 |
| H | Public | 2 | 2.75 | 3.25 | 4 | 5 | 6.25 | 7.5 |
| dc | Public | 7 | 9 | 10 | 12 | 16 | 20 | 24 |
| d2 | Reference | 5.23 | 6.78 | 8.75 | 10.71 | 13.64 | 16.59 | 19.53 |
| a | Max | 1.0 | 1.4 | 1.6 | 2.0 | 2.5 | 3.0 | 3.5 |
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1. Other size reference bolts: GB 5783; washers: GB 9074.24, GB 9074.26 2. M8, M10, M12 H values and GB 9074.24-88 corresponding values are not consistent. |
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In the process of mechanical operation, due to vibration, impact or temperature changes and other reasons, the cushioning effect of the elastic pad and the flat pad can effectively reduce the problems of loose screws or deformation of the connecting parts, thus increasing the reliability of the connection.
The bolt-spring pad and the flat pad can lock the position of the connecting part, keep it in the correct position, and prevent movement due to external force, ensuring the tightness and stability of the connection.
The connection component in bearing screw connections often produces stress. The bolt plus elastic pad and flat pad can bear these stresses, lighten the load of the connecting parts, thus avoiding damage to the connecting parts.
Outside hexagon head screw elastic pad application fields are very wide — not only used in construction, automotive, mechanical, electronic, and electrical industries, but also visible in daily life for furniture assembly, electrical goods, and other applications.
Hexagon head combination bolts are used for important assemblies requiring high accuracy and capable of withstanding larger impact forces. For example, in automobile manufacturing, they are widely used for body and engine installation. In mechanical equipment, they connect mechanical parts and components. In construction, they are used to connect steel structures.
