Running Torque

Running torque testing measures the torque required to keep a component rotating once movement has started. It differs from breakaway torque, which measures the initial force needed to overcome static friction. Running torque focuses on the rotational resistance during continuous motion.

This measurement is vital in engineering and quality control because excessive or inconsistent running torque can lead to premature wear, reduced efficiency, or failure in service. In sectors such as automotive, healthcare, packaging, and general manufacturing, controlling running torque ensures reliable performance, optimised ergonomics, and compliance with industry standards.

Accurate, repeatable running torque data allows engineers to refine product design, improve assembly processes, and reduce warranty claims, all while safeguarding the end-user experience.

Running torque testing is used across a wide range of industries and products, including:

• Automotive – bearings, valves, window regulators, and rotating shafts where consistent movement under load is essential.
• Medical devices – rotary mechanisms in surgical or diagnostic instruments that must operate smoothly without causing strain or malfunction.
• Industrial assemblies – gear mechanisms, dampers, or drive components where operational efficiency is linked to controlled resistance.
• Packaging and closures – caps, lids, and dispensers that must operate within defined torque limits for usability and seal integrity.

In each case, precise measurement helps confirm that a component meets specification and performs consistently throughout its service life.

Running torque is typically measured using precision torque sensors mounted within a controlled test stand. The component under test is rotated at a defined speed, and torque is measured continuously during motion. Test fixtures are designed to replicate real-world operating conditions, ensuring results are relevant to in-service performance.

Mecmesin’s motorised torque testers, such as the HelixaPro for high-resolution, low-capacity applications, and the OmniTest or MultiTest-dV systems for higher torque ranges, offer the accuracy and control needed for repeatable results. Paired with VectorPro software, engineers can:

• Define and automate test parameters such as rotational speed and direction.
• Capture continuous torque profiles for detailed analysis.
• Export results for traceability and quality reporting.

Running torque tests are often performed in line with established industry standards to ensure comparability and acceptance. Relevant examples include:

• ASTM standards for mechanical assemblies and fastener torque measurement.
• BS EN specifications for automotive and engineering components.
• CETIE guidance for closure and packaging torque testing.

Following these protocols supports regulatory compliance, product certification, and consistent manufacturing quality.

An automotive manufacturer sought to improve the ergonomic performance of its manual window regulators. Running torque testing revealed the ideal balance between user effort and mechanical resistance, leading to reduced component wear, improved durability, and lower warranty claims.

In the packaging sector, closure manufacturers have used running torque testing to ensure caps can be opened and resealed repeatedly without loss of seal integrity, improving both product safety and customer satisfaction.

When specifying a running torque test system, engineers should consider:

• Measurement range and resolution – ensuring capability for the torque levels and accuracy required.
• Application-specific fixtures – to replicate real-world mounting and operation.
• Control and repeatability – motorised systems improve measurement consistency over manual testing.
• Data capture and analysis – integrated software for live display, graphing, and reporting.
• Standards compliance – ensuring compatibility with relevant test protocols.

Mecmesin offers modular solutions adaptable to multiple torque testing applications, helping you maximise investment value while ensuring long-term accuracy.

With over 40 years of experience in precision torque measurement, Mecmesin designs and builds systems to meet the demanding requirements of engineers and quality professionals worldwide. Our equipment combines robust mechanical engineering with advanced control through VectorPro software, enabling:

• Precise, automated test control.
• Detailed analysis of continuous torque data.
• Full traceability for audit and compliance purposes.

Supported by a global network of calibration and service centres, every Mecmesin system delivers reliable, accurate performance throughout its operational life.

Contact our technical team to discuss your running torque testing requirements and find the right Mecmesin solution for your application.