ASTM D5649-94

Standard Test Method for Torque Strength of Adhesives Used on Threaded Fasteners

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.

General Information

• Status: Historical
• Publication Date: 09-Mar-2001
• ICS: 21.060.01 - Fasteners in general
• ICS: 83.180 - Adhesives
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.60 - Adhesive Material Classification System

Relations

• Replaced By: ASTM D5649-01 - Standard Test Method for Torque Strength of Adhesives Used on Threaded Fasteners
• Effective Date: 10-Mar-2001
• Referred By: ASTM D6465-99(2016) - Standard Guide for Selecting Aerospace and General Purpose Adhesives and Sealants
• Effective Date: 10-Mar-2001
• Referred By: ASTM D5363-16 - Standard Specification for Anaerobic Single-Component Adhesives (AN)
• Effective Date: 10-Mar-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5649 – 94
Standard Test Method for
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 tion with regard to the determination of the securing or locking
effect of adhesives used in threaded fasteners. This test method
1.1 This test method is used to make comparative assess-
may also be used to determine the degree of cure and the effect
ments of the securing or locking effect of adhesives used in
of environment on torque strength.
threaded assemblies.
5.2 The accuracy of the test results depends to a large
1.2 This standard does not purport to address all of the
degree on the thread clearance of the test fasteners and the
safety concerns, if any, associated with its use. It is the
inclusion of air bubbles in the bond line. Data generated by this
responsibility of the user of this standard to establish appro-
test method should be safety-factored accordingly if used as
priate safety and health practices and determine the applica-
quality assurance acceptance or rejection.
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
6.1 Electronic Recording—Test machine consisting of a
2.1 ASTM Standards:
clamping device to secure the bolt head, and a device for
D 907 Terminology of Adhesives
turning the nut with simultaneous measurement and registra-
D 2651 Guide for Preparation of Metal Surfaces for Adhe-
tion of the torque as a function of the angle of turning by direct
sive Bonding
analog or digital means.
E 177 Practice for Use of the Terms Precision and Bias in
6.2 Direct Reading—A clamping device to secure the head
ASTM Test Methods
of the bolt, and a torque wrench accurate to 65%.
E 691 Practice for Conducting an Interlaboratory Test Pro-
gram to Determine the Precision of a Test Method
7. Test Specimens
3. Terminology 7.1 Any size and substrate fasteners may be used upon
agreement between the supplier and the user of adhesives.
3.1 Definitions—For technical terms pertaining to adhe-
7.2 Unless otherwise agreed upon between the user and the
sives, see Terminology D 907.
adhesive manufacturer, all non-plated nuts and bolts shall be
3.2 Definitions of Terms Specific to This Standard:
degreased (refer to Guide D 2651), stored in an atmosphere of
3.2.1 breakaway torque—the initial torque required to break
low humidity, and kept clean.
the bond measured at the first movement between the nut and
7.3 Where desired, and if agreed upon between the user and
the bolt when unscrewing an unseated assembly.
the adhesive manufacturer, non-plated nuts and bolts may be
3.2.2 on torque—the maximum torque required to screw the
used as received, reoiled, or after other special treatments.
nut onto a preapplied adhesive-coated bolt.
7.4 Plated nuts and bolts do not normally require any special
3.2.3 prevailing torque—the torque measured after the ini-
cleaning prior to assembly.
tial breakage of the bond measured at 180° rotation of the nut.
8. Assembly
4. Summary of Test Method
8.1 Assemble not less than five specimens for each test as
4.1 This test method consists of determining the torque
follows:
required to unscrew a bonded nut and bolt assembly. Break-
8.1.1 Nuts and bolts shall be preassembled prior to applica-
away torque and prevailing torque are determined.
tion of adhesive. Any pairs showing sticking due to burrs or
5. Significance and Use damaged threads shall be discarded. Disassemble the parts.
8.1.2 For liquid adhesives, apply sufficient adhesive to the
5.1 This test method provides reasonably accurate informa-
bolt to completely cover an area equal to the height of the nut
plus three threads. Also, apply adhesive to the threads of the
This test method is under the jurisdiction of ASTM Committee D-14 on
nut. Follow the adhesives manufacturer’s instructions for
Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal
application of preapplied adhesives.
Bonding Adhesives.
8.1.3 Screw the nut onto the bolt by hand, allowing three
Current edition approved Dec. 15, 1994. Published February 1995.
Annual Book of ASTM Standards, Vol 15.06. threads to protrude. For preapplied adhesives, screw the nut
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 5649
onto the coated bolt using the apparatus in 6.1 or 6.2 and record 10.1.6 Number of specimens tested,
the on torque. Allow three adhesive-coated threads to protrude. 10.1.7 Testing speed,
8.1.4 Cure the adhesive in accordance with the manufactur- 10.1.8 Test equipment, and
er’s instructions with the test specimen standing vertically on 10.1.9 Average value for torque strengths determined.
the bolt head.
11. Precision and Bias
8.1.4.1 When specified or recommended, for primed or
11.1 Precision—An interlaboratory study of the torque
activated surfaces, use the manufacturer’s primer. Apply the
strength of anaerobic adhesives was run in 1992. Each of eight
primer and
...