ASTM F959-02
(Specification)Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners
Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners
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 diameter sizes 1/2 through 1 1/2 in. are covered:
1.2.1 Type 325—direct tension indicators for use with Specification A 325 bolts, and
1.2.2 Type 490—direct tension indicators for use with Specification A 490 bolts.
1.3 Direct tension indicators are intended for installation under either a bolt head or a hardened washer. (See Research Council on Structural Connections: Specification for Structural Joints Using ASTM A 325 or A 490 Bolts.)
1.4 The following precautionary statement pertains only to the test method portions, Section and of this specification: 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: F 959 – 02
Standard Specification for
Compressible-Washer-Type Direct Tension Indicators for
1
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
1 1
diameter sizes ⁄2 through 1 ⁄2 in. are covered:
1.2.1 Type 325—direct tension indicators for use with
Specification A 325 bolts, and
1.2.2 Type 490—direct tension indicators for use with
Specification 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.)
F 1470 Guide for Fastener Sampling for Specified Mechani-
1.4 The following precautionary statement pertains only to
2
cal Properties and Performance Inspection
the test method portions, Section 12 and Appendix X1 of this
2.2 Research Council on Structural Connections:
specification: This standard does not purport to address all of
5
Specification for Structural Joints Using ASTM A 325 or
the safety concerns, if any, associated with its use. It is the
5
A 490 Bolts
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use.
3.1 Definitions of Terms Specific to This Standard:
2. Referenced Documents
3.1.1 compressible-washer-type direct tension indicator,
n—a washer-type element inserted under the bolt head or
2.1 ASTM Standards:
hardened washer, having the capability of indicating the
A 325 Specification for Structural Bolts, Steel, Heat
2
achievement of a required minimum bolt tension by the degree
Treated, 120/105 ksi Minimum Tensile Strength
of direct tension indicator plastic deformation. Hereafter re-
A 490 Specification for Heat-Treated Steel Structural Bolts,
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ferred to as direct tension indicator.
150 ksi Minimum Tensile Strength
B 695 Specification for Coatings of Zinc Mechanically
4. Ordering Information
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Deposited on Iron and Steel
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4.1 Orders for direct tension indicators under this specifica-
D 3951 Practice for Commercial Packaging
tion shall include the following:
F 606 Standard Test Methods for Determining the Mechani-
4.1.1 Quantity (number of pieces);
cal Properties of Externally and Internally Threaded Fas-
2
4.1.2 Name of product (direct tension indicator);
teners, Washers, and Rivets
4.1.3 Size, that is, nominal diameter;
4.1.4 ASTM designation and year of issue (if not specified,
1
current issue shall be used);
This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
4.1.5 Type required, 325 or 490 (1.2);
Nuts, Rivets, and Washers.
4.1.6 Coating type, if required (5.4);
Current edition approved April 10, 2002. Published May 2002. Originally
published as F 959 – 85. Last previous edition F 959 – 01a.
2
Annual Book of ASTM Standards, Vol 01.08.
3 5
Annual Book of ASTM Standards, Vol 02.05. Available from Research Council on Structural Connections at www.boltcoun-
4
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 959–02
4.1.7 Source inspection, if required (Section 13); 7. Performance Requirements
4.1.8 Certificates of compliance or test reports, if required
7.1 Compression Loads—When compressed to the gap
(Section 15); and
specified in Table 2, the compression load shall conform to the
4.1.9 Any special requirements.
requirements specified in Table 3.
8. Dimensions
5. Materials and Manufacture
8.1 The direct tension indicators shall conform to the
5.1 Steel used in the manufacture of direct tension indica-
dimensions specified in Table 4.
tors shall be produced by the basic-oxygen or electric-furnace
process.
9. Workmanship, Finish, and Appearance
5.2 Design:
9.1 The direct tension indicators shall be commercially
5.2.1 Direct tension indicators shall have a configuration
smooth and free of injurious material or manufacturing defects
...
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