ASTM F959M-02

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Designation: F 959M – 02
METRIC
Standard Specification for
Compressible-Washer-Type Direct Tension Indicators for
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Use With Structural Fasteners [Metric]
This standard is issued under the fixed designation F 959M; 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* F 606M Test Methods for Determining the Mechanical
Properties of Externally and Internally Threaded Fasteners,
1.1 This specification covers the requirements for
Washers, and Rivets [Metric]
compressible-washer-type direct tension indicators capable of
F 1470 Guide for Fastener Sampling for Specified Mechani-
indicating the achievement of a specified minimum bolt tension
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cal Properties and Performance Inspection
in a structural bolt.
2.2 Research Council on Structural Connections Standard:
1.2 Two types of direct tension indicators in nominal
Specification for Structural Joints Using ASTM A 325 or A
diameter sizes M16 through M36 are covered:
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490 Bolts
1.2.1 Type 8.8—direct tension indicators for use with Speci-
fication A 325M bolts, and
3. Terminology
1.2.2 Type 10.9—direct tension indicators for use with
3.1 Definitions of Terms Specific to This Standard:
Specification A 490M bolts.
3.1.1 compressible-washer-type direct tension indicator,
1.3 Direct tension indicators are intended for installation
n—a washer-type element inserted under the bolt head or
under either a bolt head or a hardened washer. (See Research
hardened washer, having the capability of indicating the
Council on Structural Connections: Specification for Structural
achievement of a required minimum bolt tension by the degree
Joints Using ASTM A 325 or A 490 Bolts.)
of direct tension indicator plastic deformation. Hereafter re-
1.4 The following precautionary statement pertains only to
ferred to as direct tension indicator.
the test methods portions, Section 12, and Appendix X1 of this
specification: This standard does not purport to address all of
4. Ordering Information
the safety concerns, if any, associated with its use. It is the
4.1 Orders for direct tension indicators under this specifica-
responsibility of the user of this standard to establish appro-
tion shall include the following:
priate safety and health practices and determine the applica-
4.1.1 Quantity (number of pieces);
bility of regulatory limitations prior to use.
4.1.2 Name of product (direct tension indicator);
2. Referenced Documents 4.1.3 Size, that is, nominal diameter;
4.1.4 ASTM designation and year of issue (if not specified,
2.1 ASTM Standards:
current issue shall be used);
A 325M Specification for Structural Bolts, Steel, Heat-
2 4.1.5 Type required, 8.8 or 10.9 (see 1.2);
Treated, 120/105 ksi Minimum Tensile Strength [Metric]
4.1.6 Coating type, if required (see 5.4);
A 490M Specification for High-Strength Steel Bolts,
4.1.7 Source inspection, if required (Section 13);
Classes 10.9 and 10.9.3, for Structural Steel Joints [Met-
2 4.1.8 Certificates of compliance or test reports, if required
ric]
(Section 15); and
B 695 Specification for Coatings of Zinc Mechanically
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4.1.9 Any special requirements.
Deposited on Iron and Steel
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D 3951 Practice for Commercial Packaging
5. Materials and Manufacture
5.1 Steel used in the manufacture of direct tension indica-
tors shall be produced by the basic-oxygen or electric-furnace
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This specification is under the jurisdiction of ASTM Committee F16 on
process.
Fasteners and is the direct responsibility of Subcommittee F16.02 Steel Bolts, Nuts,
Rivets, and Washers.
Current edition approved April 10, 2002. Published May 2002. Originally
published as F 959M – 94. Last previous edition F 959M – 01a.
2 4
Annual Book of ASTM Standards, Vol 01.08. Available from Research Council on Structural Connections at www.boltcoun-
3
Annual Book of ASTM Standards, Vol 15.09. cil.org.
*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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F 959M – 02
TABLE 2 Direct Tension Indicator Gap for Compression Load
5.2 Design:
Testing
5.2.1 Direct tension indicators shall have a configuration
produced by extrusion, punching, pressing, or similar forming,
Gap, mm
to permit a measurable decrease in thickness when placed in
Direct Tension Indicator Finish
Specification Specification
compression.
8.8 10.9
5.2.2 The design shall be such that the degree of plastic
Plain finish 0.4 0.4
deformation shall indicate the tension in a tightened structural Mechanically galvanized 0.4 . . .
Baked epoxy coating on
bolt.
...