ASTM F959-01a

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Designation: F 959 – 01a
Standard Specification for
Compressible-Washer-Type Direct Tension Indicators for
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Use with Structural Fasteners
This standard is issued under the fixed designation F 959; 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 *
1.1 This specification covers the requirements for
compressible-washer-type direct tension indicators capable of
indicating the achievement of a specified minimum bolt tension
in a structural bolt.
1.2 Two types of direct tension indicators in nominal
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diameter sizes ⁄2 through 1 ⁄2 in., are covered:
1.2.1 Type 325—direct tension indicators for use with A 325
bolts, and
1.2.2 Type 490—direct tension indicators for use with A 490
bolts.
1.3 Direct tension indicators are intended for installation
FIG. 1 Direct Tension Indicator Protrusion Tangential Diameter
under either a bolt head or a hardened washer. (See Research
(PTD)
Council on Structural Connections: Specification for Structural
Joints Using ASTM A 325 or A 490 Bolts.)
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1.4 The following precautionary statement pertains only to
F 436 Specification for Hardened Steel Washers
the test method portions, Section 12 and Annex A1, of this
F 1470 Guide for Fastener Sampling for Specified Mechani-
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specification: This standard does not purport to address all of
cal Properties and Performance Inspection
the safety concerns, if any, associated with its use. It is the
2.2 Research Council on Structural Connections:
responsibility of the user of this standard to establish appro-
Specification for Structural Joints Using ASTM A 325 or
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priate safety and health practices and determine the applica-
A 490 Bolts
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bility of regulatory limitations prior to use.
2.3 ANSI Standards:
B 18.2.1 Square and Hex Bolts and Screws
2. Referenced Documents
B 18.2.2 Square and Hex Nuts
2.1 ASTM Standards:
3. Terminology
A 325 Specification for Structural Bolts, Steel, Heat
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Treated, 120/105 ksi Minimum Tensile Strength
3.1 Definitions of Terms Specific to This Standard:
A 490 Specification for Heat-Treated Steel Structural Bolts,
3.1.1 compressible-washer-type direct tension indicator—a
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150 ksi Minimum Tensile Strength
washer-type element inserted under the bolt head or hardened
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A 563 Specification for Carbon and Alloy Steel Nuts
washer, having the capability of indicating the achievement of
B 695 Specification for Coatings of Zinc Mechanically
a required minimum bolt tension by the degree of direct tension
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Deposited on Iron and Steel
indicator plastic deformation. Hereafter referred to as direct
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D 3951 Practice for Commercial Packaging
tension indicator.
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E 4 Practices for Force Verification of Testing Machines
4. Ordering Information
4.1 Orders for direct tension indicators under this specifica-
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tion shall include the following:
This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
4.1.1 Quantity (number of pieces);
Nuts, Rivets and Washers.
Current edition approved Oct. 10, 2001. Published December 2001. Originally
published as F 959 – 85. Last previous edition F 959 – 01.
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Annual Book of ASTM Standards, Vol 01.08. Available from Research Council on Structural Connections, c/o Industrial
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Annual Book of ASTM Standards, Vol 02.05. Fasteners Institute, 1717 East 9th Street, Cleveland, OH 44114.
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Annual Book of ASTM Standards, Vol 15.09. Available from American National Standards Institute, 11 West 42nd St., 13th
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Annual Book of ASTM Standards, Vol 03.01. 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 959
4.1.2 Name of product (direct tension indicator); chemical composition shall conform to the requirements given
4.1.3 Size, that is, nominal diameter; in Table 1, Product Analysis.
4.1.4 ASTM designation and year of issue (if not specified,
7. Performance Requirements
current issue shall be used);
4.1.5 Type required, 325 or 490 (1.2);
7.1 Compression Loads—Direct tension indicators shall be
4.1.6 Coating type, if required (5.4);
tested in accordance with Annex A1 of this specification. When
4.1.7 Source inspection, if required (Section 13);
compressed to the gap specified in Table 2, the compression
4.1.8 Certificates of compliance or test reports, if required
load shall conform to the requirements specified in Table 3.
(Section 15); and
4.1.9 Any special requirements. 8. Dimensions
8.1 The dire
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