ASTM D5649-01
(Test Method)Standard Test Method for Torque Strength of Adhesives Used on Threaded Fasteners
Standard Test Method for Torque Strength of Adhesives Used on Threaded Fasteners
SIGNIFICANCE AND USE
This test method provides reasonably accurate information with regard to the determination of the securing or locking effect of adhesives used in threaded fasteners. This test method may also be used to determine the degree of cure and the effect of environment on torque strength.
The accuracy of the test results depends to a large degree on the thread clearance of the test fasteners and the inclusion of air bubbles in the bond line. Data generated by this test method should be safety-factored accordingly if used as quality assurance acceptance or rejection.
SCOPE
1.1 This test method is used to make comparative assessments of the securing or locking effect of adhesives used in threaded assemblies.
1.2 The values stated in inch-pound units are to be regarded as the standard.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D5649–01
Standard Test Method for
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Torque Strength of Adhesives Used on Threaded Fasteners
This standard is issued under the fixed designation D 5649; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
1.1 This test method is used to make comparative assess- 5.1 This test method provides reasonably accurate informa-
ments of the securing or locking effect of adhesives used in tion with regard to the determination of the securing or locking
threaded assemblies. effect of adhesives used in threaded fasteners. This test method
1.2 The values stated in inch-pound units are to be regarded may also be used to determine the degree of cure and the effect
as the standard. of environment on torque strength.
1.3 This standard does not purport to address all of the 5.2 The accuracy of the test results depends to a large
safety concerns, if any, associated with its use. It is the degree on the thread clearance of the test fasteners and the
responsibility of the user of this standard to establish appro- inclusion of air bubbles in the bond line. Data generated by this
priate safety and health practices and determine the applica- test method should be safety-factored accordingly if used as
bility of regulatory limitations prior to use. quality assurance acceptance or rejection.
2. Referenced Documents 6. Apparatus
2.1 ASTM Standards: 6.1 Electronic Recording—Test machine consisting of a
D 907 Terminology of Adhesives clamping device to secure the bolt head, and a device for
D 2651 Guide for Preparation of Metal Surfaces for Adhe- turning the nut with simultaneous measurement and registra-
sive Bonding tion of the torque as a function of the angle of turning by direct
E 177 Practice for Use of the Terms Precision and Bias in analog or digital means.
ASTM Test Methods 6.2 Direct Reading—Aclamping device to secure the head
E 691 Practice for Conducting an Interlaboratory Study to of the bolt, and a torque wrench accurate to 65%.
Determine the Precision of a Test Method
7. Test Specimens
3. Terminology
7.1 Any size and substrate fasteners may be used upon
3.1 Definitions—For technical terms pertaining to adhe- agreement between the supplier and the user of adhesives.
sives, see Terminology D 907. 7.2 Unless otherwise agreed upon between the user and the
3.2 Definitions of Terms Specific to This Standard: adhesive manufacturer, degrease all non-plated nuts and bolts
3.2.1 breakaway torque—theinitialtorquerequiredtobreak (refer to Guide D 2651), store in an atmosphere of low
the bond measured at the first movement between the nut and humidity, and keep them clean.
the bolt when unscrewing an unseated assembly. 7.3 Where desired, and if agreed upon between the user and
3.2.2 on torque—the maximum torque required to screw the the adhesive manufacturer, non-plated nuts and bolts may be
nut onto a preapplied adhesive-coated bolt. used as received, reoiled, or after other special treatments.
3.2.3 prevailing torque—the torque measured after the ini- 7.4 Platednutsandboltsdonotnormallyrequireanyspecial
tial breakage of the bond measured at 180° rotation of the nut. cleaning prior to assembly.
4. Summary of Test Method 8. Assembly
4.1 This test method consists of determining the torque 8.1 Assemble not less than five specimens for each test as
required to unscrew a bonded nut and bolt assembly. Break- follows:
away torque and prevailing torque are determined. 8.1.1 Preassemble nuts and bolts prior to application of
adhesive. Discard any pairs showing sticking due to burrs or
damaged threads. Disassemble the parts.
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This test method is under the jurisdiction of ASTM Committee D14 on
8.1.2 For liquid adhesives, apply sufficient adhesive to the
Adhesives and is the direct responsibility of Subcommittee D14.60 on Adhesive
bolt to completely cover an area equal to the height of the nut
Material Classification System.
plus three threads. Also, apply adhesive to the threads of the
Current edition approved March 10, 2001. Published May 2001. Originally
published as D 5649 - 94. Last previous edition D 5649 - 94.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5649–01
nut. Follow the adhesives manufacturer’s instructions for 10.1.5 Conditioning procedure used for specimens prior to
application of preapplied adhesives. testing.
8.1.3 Screw the nut onto the bolt by hand, allowing three
10.1.6 Number of specimens tested,
threads to protrude. For preapplied adhesives, screw
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