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China Suppliers Factory Hexagon Head Bolt Assembly with Spring and Plain Washers for Construction and Mechanical Use
| Thread size d |
M3 | M4 | M5 | M6 | M8 | M10 | M12 | |
| h ② | 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 |
| 1,000 pieces of steel weigh ≈ kg | - | - | - | - | - | - | - | |
| 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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Main Uses of the Hexagonal Screw with Flat & Spring Washer Combination
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Buffering Effect 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 the loose screw or the deformation of the connecting parts, thus increasing the reliability of the connection.
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Locking Action The bolt-spring pad and the flat pad can lock the position of the connecting part, keep it in the correct position, and prevent the movement due to the external force, to ensure the tightness and stability of the connection.
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Reduce Connection Component Damage The connection component in the bearing screw connection often produce stress. The bolt plus elastic pad and flat pad can bear these stresses, lighten the load of the connecting parts, thus avoiding the damage of the connecting parts.
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Wide Application Fields Outside hexagon head screw elastic pad application fields are very wide, not only can be used in construction, automotive, mechanical, electronic, electrical and other industries. In daily life, we can also see their use in the assembly of furniture, electrical goods and other applications.
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Specific Applications Hexagon head combination bolts are used for important assembly accuracy requirements and occasions that withstand larger impact forces. For example, in automobile manufacturing, they are widely used for body and engine installation. In the manufacturing and maintenance of mechanical equipment, often used for connecting mechanical parts and components. In construction, used to connect steel structures.
Hexagon screw with flat cushion is a kind of multi-functional mechanical part, which is mainly used to provide stable connection and buffer, and is widely used in various industrial and civil fields.
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Frequently Asked Questions
QWhat is a hexagon head bolt with spring washer and plain washer assembly?
A hexagon head bolt with spring washer and plain washer assembly is a fastener combination consisting of a hexagonal bolt, a spring (lock) washer, and a flat (plain) washer. This combination provides secure fastening, vibration resistance, and load distribution for various mechanical and structural applications.
QWhat thread sizes are available for this bolt assembly?
These bolt assemblies are available in standard metric thread sizes: M3, M4, M5, M6, M8, M10, and M12. Each size has specific dimensional specifications including washer thickness (h), overall height (H), outer diameter (dc), and other parameters as shown in the table above.
QWhat GB standards do these bolt assemblies conform to?
These assemblies reference Chinese GB standards: bolts conform to GB 5783, and washers conform to GB 9074.24 and GB 9074.26. Please note that for M8, M10, and M12 sizes, the H values may not be fully consistent with GB 9074.24-88 specifications.
QWhich industries use hexagon head bolt with washer assemblies?
These assemblies are widely used across construction (steel structure connections), automotive manufacturing (body and engine assembly), mechanical engineering (machine components), electronics, electrical equipment, as well as everyday applications such as furniture assembly and household appliance production.
QWhy is a spring washer used together with a plain washer?
The spring (elastic) washer provides a locking and vibration-dampening function by exerting spring force that resists bolt loosening under dynamic loads. The plain washer distributes the clamping load over a larger surface area, protecting the connected components from damage. Together they deliver a secure, long-lasting connection.
QHow do I select the correct bolt assembly size for my application?
Choosing the right size depends on load requirements, material thickness, and required connection strength. Refer to the specification table above for dimensional data. For high-precision assemblies or applications subject to significant impact forces — such as automotive or heavy machinery — consult our technical team to confirm the appropriate size and grade.