High-strength structural bolting assemblies for preloading are a high-strength fastener system designed to apply precise preload in structural connections. They are widely used in steel structures, mechanical engineering, and other fields requiring resistance to dynamic loads, vibrations, or extreme working conditions. Their core function is to clamp connected components tightly with controllable preload, ensuring the stability, safety, and durability of the overall structure.
Product Parameters
|
Drive Style |
Heavy Hex Head Bolts |
|
Screw Features |
Heavy Hex |
|
System of Measurement |
Metric |
|
Thread Direction |
Right Hand |
|
Threading |
Partially threaded |
|
Thread Fit |
Class 6g |
|
Thread Spacing |
Coarse |
|
Grade/Class |
10.9HV |
|
Material |
Alloy steel |
|
Standard |
EN 14399-4 |
|
Finish |
Black Oxide |
|
RoHS |
RoHS 3 (2015/863/EU) Compliant |
|
Country of Origin |
China |
Product Drawing
|
High-strength Structural hex bolts System-HV |
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DIN EN 14399-4-2006 |
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d(mm) |
P(mm) |
b(mm) |
k(mm) |
s(mm) |
ds(mm) |
|||||
|
Nom |
min |
max |
min |
max |
Nom |
min |
max |
|||
|
M12 |
1.75 |
23 |
8 |
7.55 |
8.45 |
21.16 |
22 |
12 |
11.3 |
12.7 |
|
M16 |
2 |
28 |
10 |
9.25 |
10.75 |
26.16 |
27 |
16 |
15.3 |
16.7 |
|
M20 |
2.5 |
33 |
13 |
12.1 |
13.9 |
31 |
32 |
20 |
19.16 |
20.84 |
|
M22 |
2.5 |
34 |
14 |
13.1 |
14.9 |
35 |
36 |
22 |
21.16 |
22.84 |
|
M24 |
3 |
39 |
15 |
14.1 |
15.9 |
40 |
41 |
24 |
23.16 |
24.84 |
|
M27 |
3 |
41 |
17 |
16.1 |
17.9 |
45 |
46 |
27 |
26.16 |
27.84 |
|
M30 |
3.5 |
44 |
19 |
17.95 |
20.05 |
49 |
50 |
30 |
29.16 |
30.84 |
|
M36 |
4 |
52 |
23 |
21.95 |
24.05 |
58.8 |
60 |
36 |
35 |
37 |
Main Features
Pretension control: Pretension ensures the tightness and reliability of connections, reducing looseness or slippage caused by external loads.
Multiple systems: Common systems include HR and HV systems, which differ slightly in design-primarily in the fracture characteristics of bolts and nuts.
Material grades: They are usually available in two material grades (8.8 and 10.9) to meet different strength requirements.
Matching components: Bolt assemblies typically include bolts, nuts, and washers; in some cases, direct tension indicator (DTI) washers are also used.
Certification and marking: Bolt assemblies that meet the EN 14399 standard must undergo initial type testing and regular audits, and carry CE and UKCA markings.
Installation and Maintenance
Application of pretension: Apply pretension using a torque wrench or electric screwdriver to ensure the bolt reaches the design's required pretension.
Direct tension indicator (DTI): Used to verify that the bolt has achieved the correct pretension, confirmed by measuring the gap on the washer.
Regular inspection: After installation, regularly check the pretension of the bolts to ensure connection reliability.
Application Scenarios
Building structures: Used for structures requiring high-strength connections, such as high-rise buildings and large bridges.
Bridge engineering: Particularly suitable for bridge connections bearing repeated moving loads.
Industrial facilities: Used for industrial structures needing high-strength connections, such as large machinery and pressure vessels.
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