ISO 6789-2-2017 PDF

Full title and description

Assembly tools for screws and nuts — Hand torque tools — Part 2: Requirements for calibration and determination of measurement uncertainty. This International Standard specifies methods for calibration of hand torque tools and the calculation of measurement uncertainties associated with those calibrations.

Abstract

ISO 6789-2:2017 defines the method for calibration of hand torque tools (both step-by-step/static and continuous/quasi-static) and describes how to calculate measurement uncertainty for calibration results. It sets minimum calibration requirements for torque measurement devices where a traceable calibration certificate does not already provide the relative measurement uncertainty interval. The document applies to indicating (Type I) and setting (Type II) hand torque tools.

General information

• Status: Published (International Standard).
• Publication date: 2017-02 (ISO publication, first edition 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.140.30 (Hand-operated tools).
• Edition / version: Edition 1, 2017.
• Number of pages: 41 (ISO published PDF: 41 pages; some national/adopted versions report different page counts in their translations/formatting).

Scope

Specifies the calibration method and calculation of measurement uncertainty for hand torque tools whose torque is determined by measuring elastic deformation or another measured variable proportional to torque. Applies to both indicating (Type I) and setting (Type II) hand torque tools and covers static (step-by-step) and quasi-static (continuous) calibration procedures. It provides minimum calibration requirements when a traceable calibration certificate does not already state the relative measurement uncertainty interval.

Key topics and requirements

• Defined procedure for step-by-step (static) and continuous (quasi-static) calibration of torque measurement devices.
• Methodology for calculating measurement uncertainty for calibration results (including how to determine and report the relative measurement uncertainty interval).
• Minimum calibration requirements when traceable calibration certificates do not provide W′md (relative measurement uncertainty interval).
• Applicability to indicating (Type I) and setting (Type II) hand torque tools; references identification of tool types in ISO 1703 (note regarding reference numbers and future revision of ISO 1703).
• Alignment with calibration and laboratory competence practices (consistent with expectations from accreditation standards used by calibration laboratories).

Typical use and users

Used by calibration laboratories, quality and metrology departments in manufacturing, tool manufacturers, maintenance and service organizations, and accreditation bodies to ensure hand torque tools are calibrated and that reported uncertainties are correctly estimated and traceable. It supports supplier declarations of calibration and laboratory competence for controlled tightening operations.

Related standards

ISO 6789-2:2017 is one part of the ISO 6789 series. Key related documents include ISO 6789-1:2017 (Part 1 — requirements and methods for design conformance testing and quality conformance testing; minimum requirements for declaration of conformance) and referenced standards such as ISO 1703 (tool classification/reference numbers) and accreditation/competence standards commonly used by calibration laboratories (for example ISO/IEC 17025). National and regional adoptions exist as EN/BS/DIN/NEN variants.

Keywords

hand torque tools, torque calibration, measurement uncertainty, calibration method, indicating torque tool, setting torque tool, ISO 6789, tool calibration, metrology, conformance testing.

FAQ

Q: What is this standard?

A: ISO 6789-2:2017 is the part of the ISO 6789 series that specifies requirements and methods for calibration of hand-operated torque tools and for determining the measurement uncertainty associated with those calibrations.

Q: What does it cover?

A: It covers procedures for static (step-by-step) and continuous (quasi-static) calibration of torque measurement devices, the method for calculating measurement uncertainty, minimum calibration requirements when a traceable uncertainty interval is not supplied, and applicability to indicating (Type I) and setting (Type II) hand torque tools.

Q: Who typically uses it?

A: Calibration laboratories, metrology and quality engineers in manufacturing and maintenance, tool manufacturers and service organizations, and accreditation bodies use this standard to ensure consistent calibration practices and correct reporting of measurement uncertainty.

Q: Is it current or superseded?

A: ISO 6789-2:2017 was published as the first edition in 2017 and is the current Part 2 edition; like all ISO standards it is subject to periodic review and may be under revision or adoption processes in some regions—users should check national standards bodies or ISO for the latest status if up-to-date confirmation is required.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 6789 series. Part 1 (ISO 6789-1:2017) covers design conformance testing, quality conformance testing and minimum requirements for declaration of conformance; Part 2 addresses calibration and measurement uncertainty.

Q: What are the key keywords?

A: hand torque tools, calibration, measurement uncertainty, indicating torque tools (Type I), setting torque tools (Type II), ISO 6789, torque metrology.