Nut Torque Testing Machine

Servo torsion test bench for various standard nuts, used for tightening torque, torque-clamp force and friction coefficient test of common threaded nuts

Product Overview

This nut torque testing machine adopts high-precision servo torsion drive system, suitable for ordinary hex nuts, thin nuts, flange nuts and other threaded nuts. It supports tightening torque test, torque-clamp force test, friction coefficient test and thread assembly torsion test. The equipment can record the torque change curve during nut tightening, calculate torque coefficient and friction coefficient, and assess the tightening consistency of nut batches. Equipped with interchangeable test bolts and positioning jigs, it ensures good coaxiality in the test process and reduces extra bending load. The supporting software collects torque and angle data in real time, automatically generates torque-angle curves and exports standardized test reports. It is widely used for incoming inspection, process verification and new product development of fastener manufacturers.

Applicable International Standards

The system is designed to comply with the following recognized testing standards:

• ISO 16047:2005 — Fasteners — Torque/clamp force testing

• ISO 898-2:2012 — Mechanical properties of fasteners — Nuts with specified proof load values

• ISO 2320:2015 — Fasteners — Prevailing torque steel nuts — Functional properties

Note: Specific compliance depends on model configuration, torque sensor selection and customized fixture design. Customized fixtures and test schemes for extra testing standards are available upon request.

Key Features

• High precision servo torsion drive — Smooth and stable loading, suitable for continuous tightening test of various nuts.

• Wide optional torque range — 0.01 ~ 200 N·m, multiple sensors optional, match M3~M36 nuts.

• Multi-test mode integration — Tightening torque test, torque-clamp force test, torque holding test, cyclic assembly torsion test.

• Modular test bolt fixtures — Interchangeable test bolts and positioning seats, ensure coaxiality of nut assembly.

• Rich calculated indicators — Tightening torque, friction coefficient, torque coefficient, peak torque and torque-angle curve.

• Real-time curve display — Torque-angle curve, torque-time curve displayed synchronously during testing.

• Professional test software — Curve analysis, batch data storage and formatted test report export.

• Complete safety protection — Over-torque, over-angle, overload and emergency stop protection functions.

Technical Specifications

Specifications vary by model configuration, torque sensor selection and customized fixture. Micro torque version and large-size nut fixtures can be customized on request.

Typical Applications

• Fastener manufacturing — Batch tightening torque inspection of hex nuts, flange nuts and thin nuts.

• Automotive component sector — Torque and friction coefficient test for assembly nuts of auto parts.

• General machinery industry — Verification of threaded connection performance for mechanical assembly nuts.

• Fastener R&D laboratory — Study of tightening characteristics and friction performance of nut thread pairs.

• Third-party testing institutions — Standard torque-clamp force test and certification service according to ISO 16047.