ASTM F959-07a

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Designation: F 959 – 07a
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
indicatingtheachievementofaspecifiedminimumbolttension
in a structural bolt.
1.2 Four 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
SpecificationA 325 or F 1852 Type I bolts, nuts, and washers.
1.2.2 Type 325–3—direct tension indicators for use with
Specification A 325 Type 3 bolts, nuts, and washers.
1.2.3 Type 490—direct tension indicators for use with
FIG. 1 Direct Tension Indicator Protrusion Tangential Diameter
Specification A 490 or F 2280 bolts, nuts, and washers.
(PTD)
1.2.4 Type 490–3—direct tension indicators for use with
Specification A 490 Type 3 bolts, nuts, and washers.
1.3 Direct tension indicators are intended for installation
Deposited on Iron and Steel
under either a bolt head or a hardened washer. (See Research
D 3951 Practice for Commercial Packaging
Council on Structural Connections: Specification for Structural
F 436 Specification for Hardened Steel Washers
Joints Using ASTM A 325 or A 490 Bolts.)
F 606 Test Methods for Determining the Mechanical Prop-
1.4 The following precautionary statement pertains only to
erties of Externally and Internally Threaded Fasteners,
the test method portions, Section 12 and Appendix X1 of this
Washers, Direct Tension Indicators, and Rivets
specification: This standard does not purport to address all of
F 1470 GuideforFastenerSamplingforSpecifiedMechani-
the safety concerns, if any, associated with its use. It is the
cal Properties and Performance Inspection
responsibility of the user of this standard to establish appro-
F 1852 Specification for “Twist Off” Type Tension Control
priate safety and health practices and determine the applica-
Structural Bolt/Nut/Washer Assemblies, Steel, Heat
bility of regulatory limitations prior to use.
Treated, 120/105 ksi Minimum Tensile Strength
F 2280 Specification for “Twist Off” Type Tension Control
2. Referenced Documents
Structural Bolt/Nut/Washer Assemblies, Steel, Heat
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2.1 ASTM Standards:
Treated, 150 ksi Minimum Tensile Strength
A 325 Specification for Structural Bolts, Steel, Heat 3
2.2 Research Council on Structural Connections:
Treated, 120/105 ksi Minimum Tensile Strength
Specification for Structural Joints Using ASTM A 325 or
A 490 Specification for Structural Bolts, Alloy Steel, Heat
A 490 Bolts
Treated, 150 ksi Minimum Tensile Strength 4
2.3 ASME Standard:
B 695 Specification for Coatings of Zinc Mechanically
ASME B18.2.6 Fasteners for Use in StructuralApplications
3. Terminology
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This specification is under the jurisdiction of ASTM Committee F16 on
3.1 Definitions of Terms Specific to This Standard:
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
Nuts, Rivets and Washers.
Current edition approved Dec. 1, 2007. Published January 2008. Originally
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approved in 1985. Last previous edition approved in 2007 as F 959 – 07. Available from Research Council on Structural Connections at www.boltcoun-
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or cil.org.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Society of Mechanical Engineers (ASME), ASME
Standards volume information, refer to the standard’s Document Summary page on International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
the ASTM website. www.asme.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 – 07a
3.1.1 compressible-washer-type direct tension indicator, 5.4.2 When “zinc coated” is specified, the direct tension
n—washer-type element inserted under the bolt head or hard- indicators shall be zinc coated by the mechanical deposition
ened washer, having the capability of indicating the achieve- process in accordance with the requirements of Class 55 of
ment of a required minimum bolt tension by the degree of Specification B 695.
direct tension indicator plastic deformation. Hereafter referred 5.4.3 When “baked epoxy” is specified, the epoxy shall be
to as direct tensi
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