High-Strength Bolt Tension-Torsion Testing Machine
The Computer-Controlled High-Strength Bolt Tension-Torsion Testing Machine is designed for combined tensile and torsional mechanical performance testing of high-strength bolts. The system integrates the loading system, transmission system, support structure, digital data acquisition and measurement system, and computer-based measurement and control system.
It can be used to determine bolt preload, torsional fracture load, yield axial force, torque, yield torque, maximum torque, torsion angle, and torque coefficient. The system can also generate torque/axial force–torsion angle and torque/axial force–time curves for detailed analysis of bolt tightening and failure behavior.
Application
The machine is suitable for testing:
(1) High-strength structural bolts
(2) High-strength hexagon head bolts
(3) High-strength bolt and nut assemblies
(4) Torsion-control high-strength bolts
(5) Structural bolting assemblies
(6) Other high-strength threaded fasteners requiring combined tension-torsion testing
Typical testing applications include:
(1) Bolt preload testing
(2) Torque testing
(3) Axial force testing
(4) Yield torque measurement
(5) Yield axial force measurement
(6) Maximum torque testing
(7) Torsional fracture testing
(8) Torsion angle measurement
(9) Torque coefficient determination
(10) Torque/axial force and torsion-angle analysis
Standards
The supplied product information specifies the following standards:
(1) JB/T 9370-2007 — Technical Conditions for Torsion Testing Machines
(2) GB 10128-2007 — Metallic Materials — Torsion Test at Room Temperature
(3) GB/T 1231-2006 — High-Strength Large Hexagon Head Bolts, Large Hexagon Nuts and Washers for Steel Structures — Technical Conditions
(4) GB/T 3633-1995 — Sets of Torsion-Shear Type High-Strength Bolt Connections for Steel Structures
Parameters
| Parameter | Specification |
|---|---|
| Maximum Test Torque | 1000 Nm / 2000 Nm / 5000 Nm |
| Measurement Range | 1%–100% of Maximum Torque |
| Testing Machine Class | Class 0.5 / Class 1 |
| Torque Indication Error | Better than ±1% of indication |
| Torque Repeatability Error | ≤1% |
| Torsion Angle Indication Error | Better than ±1% of indication |
| Torque Resolution | 1/300000 counts, constant resolution throughout the range |
| Maximum Bolt Axial Force | 1500 kN, customizable |
| Axial Force Measurement Range | 1%–100% FS of maximum force |
| Force Indication Error | Better than ±1% of indication |
| Force Repeatability Error | ≤±1% |
| Effective Test Space | 600 mm, customizable |
| Test Speed | 0.5–360°/min, customizable |
| Torsion Angle Measurement Range | 0–unlimited |
Features
(1) Combined Tension-Torsion Testing – Simultaneously evaluates the axial force and torsional behavior of high-strength bolts.
(2) High-Strength Bolt Testing – Designed for structural and high-strength fastening applications.
(3) Computer-Controlled Operation – Integrates test control, measurement, data acquisition, and result processing.
(4) High-Resolution Torque Measurement – The supplied specification lists a resolution of 1/300000 counts with constant resolution across the measurement range.
(5) Wide Torque Capacity – Available configurations include 1000 Nm, 2000 Nm, and 5000 Nm.
(6) High Axial Force Capacity – Axial force capacity can reach 1500 kN and can be customized according to requirements.
(7) Multiple Test Curves – Can provide torque/axial force–torsion angle and torque/axial force–time curves.
(8) Customizable Test Space – The effective test space is 600 mm as standard and can be customized for different bolt dimensions.
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