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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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During mechanical operation, vibration, impact, or temperature changes can loosen screws or deform connecting parts. The cushioning effect of the elastic pad and flat pad effectively reduces these problems, increasing connection reliability.
The bolt-spring pad and flat pad lock the position of the connecting part, keeping it in the correct position and preventing movement due to external forces, ensuring tightness and stability of the connection.
Connecting components often produce stress under screw connections. Adding elastic pads and flat pads helps bear these stresses, lightening the load on connecting parts and avoiding damage.
Hexagonal screw elastic pad applications span construction, automotive, mechanical, electronic, and electrical industries. They are also used in furniture assembly and electrical goods.
Hexagon head combination bolts are ideal for high-precision assembly and high-impact occasions. Widely used in automobile body and engine installation, and steel structures.
