ASTM D5649-15(2023)

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: D5649 − 15 (Reapproved 2023)
Standard Test Method for
Torque Strength of Adhesives Used on Threaded Fasteners
This standard is issued under the fixed designation D5649; 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 3.2.1 breakaway torque, n—the initial torque required to
break the bond measured at the first movement between the nut
1.1 This test method is used to make comparative assess-
and the bolt when unscrewing an unseated assembly.
ments of the securing or locking effect of adhesives used in
3.2.2 on torque, n—the maximum torque required to screw
threaded assemblies.
the nut onto a preapplied adhesive-coated bolt.
1.2 The values stated in inch-pound units are to be regarded
3.2.3 prevailing torque, n—the torque measured after the
as standard. No other units of measurement are included in this
initial breakage of the bond measured at 180° rotation of the
standard.
nut.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 This test method consists of determining the torque
priate safety, health, and environmental practices and deter-
required to unscrew a bonded nut and bolt assembly. Break-
mine the applicability of regulatory limitations prior to use.
away torque and prevailing torque are determined.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Significance and Use
ization established in the Decision on Principles for the
5.1 This test method provides reasonably accurate informa-
Development of International Standards, Guides and Recom-
tion with regard to the determination of the securing or locking
mendations issued by the World Trade Organization Technical
effect of adhesives used in threaded fasteners. This test method
Barriers to Trade (TBT) Committee.
may also be used to determine the degree of cure and the effect
2. Referenced Documents
of environment on torque strength.
2.1 ASTM Standards:
5.2 The accuracy of the test results depends to a large
D907 Terminology of Adhesives
degree on the thread clearance of the test fasteners and the
D2651 Guide for Preparation of Metal Surfaces for Adhesive
inclusion of air bubbles in the bond line. Data generated by this
Bonding
test method should be safety-factored accordingly if used as
E177 Practice for Use of the Terms Precision and Bias in
quality assurance acceptance or rejection.
ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to 6. Apparatus
Determine the Precision of a Test Method
6.1 Electronic Recording—Test machine consisting of a
clamping device to secure the bolt head, and a device for
3. Terminology
turning the nut with simultaneous measurement and registra-
3.1 Definitions—For technical terms pertaining to
tion of the torque as a function of the angle of turning by direct
adhesives, see Terminology D907.
analog or digital means.
3.2 Definitions of Terms Specific to This Standard:
6.2 Direct Reading—A clamping device to secure the head
of the bolt, and a torque wrench accurate to 65 %.
This test method is under the jurisdiction of ASTM Committee D14 on
7. Test Specimens
Adhesives and is the direct responsibility of Subcommittee D14.60 on Adhesive
Material Classification System.
7.1 Any size and substrate fasteners may be used upon
Current edition approved May 1, 2023. Published May 2023. Originally
agreement between the supplier and the user of adhesives.
approved in 1994. Last previous edition approved in 2015 as D5649 – 15. DOI:
10.1520/D5649-15R23.
7.2 Unless otherwise agreed upon between the user and the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
adhesive manufacturer, degrease all non-plated nuts and bolts
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(refer to Guide D2651), store in an atmosphere of low
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. humidity, and keep them clean.
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D5649 − 15 (2023)
7.3 Where desired, and if agreed upon between the user and 9.1.2 Record the breakaway torque and the prevailing
the adhesive manufacturer, non-plated nuts and bolts may be torque as measured on the electronic recording equipment, or
used as received, reoiled, or after other special treatments. from a direct reading if a torque wrench is used.
7.4 Plated nuts and bolts do not normally require any special
NOTE 1—If electronic recording equipment is used, breakaway torque is
measured at the initial point of deviation from linearity on the curve which
cleaning prior to assembly.
corresponds to the first movement of the nut.
8. Assembly
10. Report
8.1 Assemble not less than five specimens for each test as
10.1 Repor
...