High Strength Torsion Shear Bolt
Grade:10.9/12.9
Material:Carbon steel
Size:5/8”~1-1/2”
Product Description
1.Basic Definition
High strength torsional shear bolt is a special design of fastener, through the principle of torsional shear fracture to achieve precise pre-tightening force control. Its core feature is the combination of high strength and torsional shear installation technology, widely used in engineering fields that require extremely high connection strength and reliability.
2. Working principle
When installing, use a special electric wrench to clamp the head and the end of the screw, and apply torque to elongate the screw to generate pre-tightening force. When the torque reaches the design value, the fracture ring is disconnected by shearing force, and the head falls off, leaving only the screw part. This process ensures accurate pre-tightening force and avoids manual errors.
Product parameters
|
d |
M16 |
M20 |
M22 |
M24 |
M27 |
M30 |
|
|
p |
2 |
2.5 |
2.5 |
3 |
3 |
3.5 |
|
|
da |
max |
18.83 |
24.4 |
26.4 |
28.4 |
32.84 |
35.84 |
|
ds |
max |
16.43 |
20.52 |
22.52 |
24.52 |
27.84 |
30.84 |
|
min |
15.57 |
19.48 |
21.48 |
23.48 |
26.16 |
29.16 |
|
|
dw |
min |
27.9 |
34.5 |
38.5 |
41.5 |
42.8 |
46.5 |
|
dk |
max |
30 |
37 |
41 |
44 |
50 |
55 |
|
k' |
Nominal |
10 |
13 |
14 |
15 |
17 |
19 |
|
max |
10.75 |
13.9 |
14.9 |
15.9 |
17.9 |
20.05 |
|
|
min |
9.25 |
12.1 |
13.1 |
14.1 |
16.1 |
17.95 |
|
|
k' |
min |
12 |
14 |
15 |
16 |
17 |
18 |
|
k'' |
max |
17 |
19 |
21 |
23 |
24 |
25 |
|
r |
min |
1.2 |
1.2 |
1.2 |
1.6 |
2 |
2 |
|
db |
max |
11.3 |
14.1 |
15.6 |
16.9 |
19.3 |
21.4 |
|
min |
11 |
13.8 |
15.3 |
16.6 |
18.7 |
20.8 |
|
|
dc ≈ |
12.8 |
16.1 |
17.8 |
19.3 |
21.9 |
24.4 |
|
|
de ≈ |
13 |
17 |
18 |
20 |
22 |
24 |
|
Products Installation
Structure and Design
Head and Break Ring: Head of the bolt is usually hexagonal with an annular groove (break ring) designed below, which breaks when the installation torque reaches a preset value.
Material Process: Alloy steel (e.g. 40Cr, 35VB), after quenching + tempering treatment, tensile strength can reach 8.8 to 12.9 grades (e.g. ASTM A325/A490). Surface Treatment: Galvanized, Dacromet coated or phosphating treatment to improve corrosion resistance.
Core Advantages
High Strength:Bearing capacity far exceeds that of ordinary bolts, suitable for dynamic loads or impact environments.
Precise Control: Fracture mechanism ensures consistency of pretightening force and improves safety of connection.
Efficiency and Quality Inspection: Fast installation (completed in a single operation), and broken head is visualized as a quality acceptance mark.
Typical application scenarios
Steel structure building: beam-column joints, high-rise building frame connection.
Bridge engineering: steel box girder splicing, suspension bridge anchorage system.
Heavy equipment: wind power tower flange, construction machinery boom.
Rail transit: high-speed rail plate fixing, vehicle chassis assembly.
Installation precautions
Use calibrated torsion shear tools to avoid torque deviation.
Check the alignment of bolts and holes before installation to prevent eccentric force.
The exposed threads of the broken screw should be ≥ 2 buckles to ensure effective connection.
Our factory
Our company is a professional fastener manufacturer integrating design, production, testing and sales. The company mainly produces and sells stainless steel machine screws, self-tapping screws, set screws, self-tapping self-drilling, rivets and other high-quality precision fasteners.
Our address
NO.280-25 Xicheng Road,Liangxi District,Wuxi City,China
Phone Number
+86 159 952 699 47
Evasummer@lemarmetal.com
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