ISO 5393:2017 PDF

Overview

ISO 5393:2017 - Rotary tools for threaded fasteners: Performance test method - specifies a laboratory test procedure to evaluate the performance of power assembly tools used to install threaded fasteners. The standard defines how to measure torque repeatability (torque scatter) across torque rates, over a manufacturer-defined torque adjustment range, and over a defined number of operating cycles. It also provides a method to assess the precision of built-in torque measurement systems (see Annex E). ISO 5393:2017 is applicable to tools powered by pneumatic, hydraulic or electric (including battery) sources and covers the torque range 0.5 Nm to 2 000 Nm (modifications outside this range are allowed if documented).

Key topics and requirements

• Torque repeatability (scatter): Laboratory measurement procedures to quantify scatter across specified torque rates and settings.
• Torque adjustment range testing: Methods to evaluate performance over the manufacturer’s defined torque adjustment window (Clause 6).
• Operating cycle performance: Procedures for testing tool stability and repeatability over a defined number of operating cycles (Clause 7).
• Built-in torque measurement precision: Method to determine combined precision of an integrated torque sensor or measurement system (Annex E).
• Test joint and fixture requirements: Specifications for test fixtures, measuring instruments and test-joint configurations to improve reproducibility (Clauses 5 and Annex B/C).
• Environmental and installation conditions: Rules on ambient conditions, alignment, power media and tool condition during tests (Clause 5).
• Data evaluation and reporting: Guidance on measurement uncertainty, graphical presentation, test reports and tool performance rating (Clauses 9–10, Annex F and G).
• Scope exclusions: Not applicable to impact/impulse wrenches, ratchet wrenches or other discontinuous increment tools.

Applications and practical value

ISO 5393:2017 is designed for laboratory-level evaluation (not routine in-plant inspections) and helps organizations to:

• Specify tool performance in procurement documents using standardized test metrics.
• Validate manufacturer claims for rotary tools and integrated torque measurement systems.
• Compare tools (pneumatic, hydraulic, electric) based on torque repeatability, consistency over cycles and measurement precision.
• Support quality and assembly engineering teams in tightening process control and tool selection for torque-critical applications.

Who should use this standard

• Power tool manufacturers and R&D teams
• Accredited test laboratories and calibration facilities
• Quality, assembly and maintenance engineers in automotive, aerospace, electronics and general manufacturing
• Procurement professionals specifying tool performance requirements

Related standards

• EURAMET/cg-14 (Guidelines on calibration of static torque measuring devices) is cited as a normative reference in ISO 5393:2017.

Keywords: ISO 5393:2017, rotary tools, threaded fasteners, torque repeatability, torque scatter, performance test method, power assembly tools, built-in torque measurement.