ASTM F959M-01

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Designation: F 959M – 01
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.
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1. Scope * D 3951 Practice for Commercial Packaging
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E 4 Practices for Load Verification of Testing Machines
1.1 This specification covers the requirements for
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F 436M Specification for Hardened Steel Washers [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
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2.3 ANSI Standards:
Specification A 325M bolts, and
B 18.2.3.7M Metric Heavy Hex Structural Bolts
1.2.2 Type 10.9—Direct tension indicators for use with
B 18.2.3.4.6M Metric Heavy Hex Nuts
Specification A 490M bolts.
1.3 Direct tension indicators are intended for installation
3. Terminology
under either a bolt head or a hardened washer. (See Appendix
3.1 Definitions of Terms Specific to This Standard:
X1.)
3.1.1 compressible-washer-type direct tension indicator—a
1.4 The following precautionary statement pertains only to
washer-type element inserted under the bolt head or hardened
the test methods portion, Section 12, Annex A1, and Appendix
washer, having the capability of indicating the achievement of
X1 of this specification: This standard does not purport to
a required minimum bolt tension by the degree of direct tension
address all of the safety concerns, if any, associated with its
indicator plastic deformation. Hereinafter referred to as direct
use. It is the responsibility of the user of this standard to
tension indicator.
establish appropriate safety and health practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Ordering Information
4.1 Orders for direct tension indicators under this specifica-
2. Referenced Documents
tion shall include the following:
2.1 ASTM Standards:
4.1.1 Quantity (number of pieces);
A 325M Specification for Structural Bolts, Steel, Heat-
2 4.1.2 Name of product (direct tension indicator);
Treated, 120/105 ksi Minimum Tensile Strength [Metric]
4.1.3 Size, that is, nominal diameter;
A 490M Specification for High-Strength Steel Bolts,
4.1.4 ASTM designation and year of issue, if not specified,
Classes 10.9 and 10.9.3, for Structural Steel Joints [Met-
2 current issue shall be used;
ric]
2 4.1.5 Type required, 8.8 or 10.9 (see 1.2);
A 563 Specification for Carbon and Alloy Steel Nuts
4.1.6 Coating type, if required (see 5.4);
B 695 Specification for Coatings of Zinc Mechanically
2 4.1.7 Source inspection, if required (Section 13);
Deposited on Iron and Steel
4.1.8 Certificates of compliance or test reports, if required
(Section 15); and
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This specification is under the jurisdiction of ASTM Committee F16 on Annual Book of ASTM Standards, Vol 15.09.
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Fasteners and is the direct responsibility of Subcommittee F16.02 Steel Bolts, Nuts, Annual Book of ASTM Standards, Vol 03.01.
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Rivets, and Washers. Available from Research Council on Structural Connections, c/o Industrial
Current edition approved Apr. 10, 2001. Published June 2001. Originally Fasteners Institute, 1717 East 9th Street, Cleveland, OH 44114.
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published as F 959M – 94. Last previous edition F 959M – 99a. Available from American National Standards Institute, 11 West 42nd St., 13th
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Annual Book of ASTM Standards, Vol 01.08. Floor, New York, NY 10036.
*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
TABLE 2 Direct Tension Indicator Gap for Compression Load
4.1.9 Any special requirements.
Testing
5. Materials and Manufacture
Gap, mm
5.1 Steel used in the manufacture of direct tension indica-
Direct Tension Indicator Finish
Specification Specification
tors shall be produced by the basic-oxygen or electric-furnace
8.8 10.9
process.
Plain finish 0.4 0.4
5.2 Design:
Mechanically galvanized 0.4 . . .
5.2.1 Direct tension indicators shall have a configuration
Baked epoxy coating on
Mechanically deposited zinc
...