ASTM E2624-17
(Practice)Standard Practice for Torque Calibration of Testing Machines
Standard Practice for Torque Calibration of Testing Machines
SIGNIFICANCE AND USE
4.1 Testing machines that apply and indicate torque are used in many industries, in many ways. They may be used in a research laboratory to measure material properties, and in a production line to qualify a product for shipment. No matter what the end use of the machine may be, it is necessary for users to know the amount of torque that is applied, and that the accuracy of the torque value is traceable to the SI. This standard provides a procedure to verify these machines and devices, in order that the indicated torque values may be traceable. A key element to having metrological traceability is that the devices used in the calibration produce known torque characteristics, and have been calibrated in accordance with Practice E2428.
4.2 This standard may be used by those using, those manufacturing, and those providing calibration service for torque capable testing machines or devices and related instrumentation.
SCOPE
1.1 This practice covers procedures and requirements for the calibration of torque for static and quasi-static torque capable testing machines. These may, or may not, have torque indicating systems and include those devices used for the calibration of hand torque tools. Testing machines may be calibrated by one of the three following methods or combination thereof:
1.1.1 Use of standard weights and lever arms.
1.1.2 Use of elastic torque measuring devices.
1.1.3 Use of elastic force measuring devices and lever arms.
1.1.4 Any of the methods require a specific uncertainty of measurement, displaying metrological traceability to The International System of Units (SI).
Note 1: – for further definition of the term metrological traceability, refer to the latest revision of JCGM 200: International vocabulary of metrology — Basic and general concepts and associated terms (VIM).
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the calibration of the torque-indicating systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must designate the torque-indicating system(s) to be calibrated and included in the report.
1.3 Since conversion factors are not required in this practice, either english units, metric units, or SI units can be used as the standard.
1.4 Torque values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or retransmitted—which are calibrated with provisions of 1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within the ±1 % of reading accuracy requirement, comply with this practice.
1.5 The following applies to all specified limits in this standard: For purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of Practice E29, for Using Significant Digits in Test Data to Determine Conformance with Specifications.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E2624 − 17
Standard Practice for
1
Torque Calibration of Testing Machines
This standard is issued under the fixed designation E2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* expressing the specification limit, in accordance with the
rounding method of Practice E29, for Using Significant Digits
1.1 This practice covers procedures and requirements for
in Test Data to Determine Conformance with Specifications.
the calibration of torque for static and quasi-static torque
1.6 This standard does not purport to address all of the
capable testing machines. These may, or may not, have torque
safety concerns, if any, associated with its use. It is the
indicating systems and include those devices used for the
responsibility of the user of this standard to establish appro-
calibration of hand torque tools. Testing machines may be
priate safety, health, and environmental practices and deter-
calibrated by one of the three following methods or combina-
mine the applicability of regulatory limitations prior to use.
tion thereof:
1.7 This international standard was developed in accor-
1.1.1 Use of standard weights and lever arms.
dance with internationally recognized principles on standard-
1.1.2 Use of elastic torque measuring devices.
ization established in the Decision on Principles for the
1.1.3 Useofelasticforcemeasuringdevicesandleverarms.
Development of International Standards, Guides and Recom-
1.1.4 Any of the methods require a specific uncertainty of
mendations issued by the World Trade Organization Technical
measurement, displaying metrological traceability to The In-
Barriers to Trade (TBT) Committee.
ternational System of Units (SI).
NOTE 1—– for further definition of the term metrological traceability,
2. Referenced Documents
refer to the latest revision of JCGM 200: International vocabulary of
2
metrology — Basic and general concepts and associated terms (VIM). 2.1 ASTM Standards:
E6Terminology Relating to Methods of Mechanical Testing
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the
E29Practice for Using Significant Digits in Test Data to
calibrationofthetorque-indicatingsystemsassociatedwiththe
Determine Conformance with Specifications
testing machine, such as a scale, dial, marked or unmarked
E74Practice of Calibration of Force-Measuring Instruments
recorderchart,digitaldisplay,etc.Inallcasesthebuyer/owner/
for Verifying the Force Indication of Testing Machines
user must designate the torque-indicating system(s) to be
E2428Practice for Calibration and Verification of Torque
calibrated and included in the report.
Transducers
1.3 Since conversion factors are not required in this
2.2 NIST Technical Notes:
practice, either english units, metric units, or SI units can be
NIST Technical Note 1297Guidelines for Evaluating and
used as the standard.
Expressing the Uncertainty of NIST Measurement Re-
3
1.4 Torque values indicated on displays/printouts of testing
sults
machine data systems—be they instantaneous, delayed, stored, 4
2.3 BIPM Standard:
or retransmitted—which are calibrated with provisions of
JCGM 200: International vocabulary of metrology — Basic
1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within
and general concepts and associated terms (VIM)
the 61% of reading accuracy requirement, comply with this
practice.
3. Terminology
1.5 The following applies to all specified limits in this
3.1 Definitions: In addition to the terms listed, see Termi-
standard: For purposes of determining conformance with these
nology E6.
specifications, an observed value or a calculated value shall be
rounded“tothenearestunit”inthelastright-handdigitusedin
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
ThispracticeisunderthejurisdictionofASTMCommitteeE28onMechanical Standards volume information, refer to the standard’s Document Summary page on
Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of the ASTM website.
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Mechanical Testing Machines and Apparatus. Available from National Institute of Standards and Technology (NIST), 100
Current edition approved Sept. 1, 2017. Published November 2017. Originally Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
4
approved in 2009. Last previous edition approved in 2015 as E2624–15. DOI: Available from BIPM (Bureau International des
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E2624 − 15 E2624 − 17
Standard Practice for
1
Torque Calibration of Testing Machines
This standard is issued under the fixed designation E2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This practice covers procedures and requirements for the calibration of torque for static and quasi-static torque capable
testing machines. These may, or may not, have torque indicating systems and include those devices used for the calibration of hand
torque tools. Testing machines may be calibrated by one of the three following methods or combination thereof:
1.1.1 Use of standard weights and lever arms.
1.1.2 Use of elastic torque measuring devices.
1.1.3 Use of elastic force measuring devices and lever arms.
1.1.4 Any of the methods require a specific uncertainty of measurement, displaying metrological traceability to The
International System of Units (SI).
NOTE 1—– for further definition of the term metrological traceability, refer to the latest revision of JCGM 200: International vocabulary of metrology
— Basic and general concepts and associated terms (VIM).
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the calibration of the torque-indicating systems associated with the testing
machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must
designate the torque-indicating system(s) to be calibrated and included in the report.
1.3 Since conversion factors are not required in this practice, either english units, metric units, or SI units can be used as the
standard.
1.4 Torque values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or
retransmitted—which are calibrated with provisions of 1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within the 61 % of
reading accuracy requirement, comply with this practice.
1.5 The following applies to all specified limits in this standard: For purposes of determining conformance with these
specifications, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in
expressing the specification limit, in accordance with the rounding method of Practice E29, for Using Significant Digits in Test
Data to Determine Conformance with Specifications.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Testing
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E74 Practice of Calibration of Force-Measuring Instruments for Verifying the Force Indication of Testing Machines
E2428 Practice for Calibration and Verification of Torque Transducers
1
This practice is under the jurisdiction of ASTM Committee E28 on Mechanical Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
Mechanical Testing Machines and Apparatus.
Current edition approved Dec. 1, 2015Sept. 1, 2017. Published January 2016November 2017. Originally approved in 2009. Last previous edition approved in 20092015
as E2624– 09. –15. DOI: 10.1520/E2624-15.10.1520/E2624-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E2624 − 17
2.2 NIST Technical Notes:
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NIST T
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