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This specification covers the requirements for two types (Types 8.8 and 10.9) of compressible-washer-type direct tension indicators, in nominal diameter sizes M16 through M36, capable of indicating the achievement of a specified minimum bolt tension in a structural bolt and are intended for installation under either a bolt head or a hardened washer. Steel materials used in the manufacture of direct tension indicators shall be designed, processed, heat treated, and protectively coated as specified. The direct tension indicators shall conform to required chemical composition, compression load, outside diameter, number of protrusions, thickness values, inside diameter, and protrusion tangential diameter values.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers the requirements for compressible-washer-type direct tension indicators, (DTIs) capable of indicating the achievement of a specified minimum bolt tension in a structural bolt.
1.2 Eight types of DTIs in nominal diameter sizes 1/2 through 11/2 in. as well as M16 through M36 are covered:
1.2.1 Type 325-1—DTIs for use with Specification Type 1 bolts or F or assemblies.
1.2.2 Type 325–3—DTIs for use with Specification Type 3 bolts or Type 3 assemblies.
1.2.3 Type 490–1—DTIs for use with Specification Type 1 bolts or assemblies.
1.2.4 Type 490–3—DTIs for use with Specification Type 3 Type 3 assemblies.
1.2.5 Type 8.8-1—DTIs for use with Specification Type 1 bolts.
1.2.6 Type 8.8-3—DTIs for use with Specification Type 3 bolts.
1.2.7 Type 10.9-1—DTIs for use with Specification Type 1 bolts.
1.2.8 Type 10.9-3—DTIs for use with Specification Type 3 bolts.
1.3 DTIs are intended for installation under either a bolt head or a hardened washer. (See Research Council on Structural Connections: Specification for Structural Joints Using High–Strength Bolts.)
1.4 This specification provides for furnishing Type 3 DTIs to a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the manufacturer’s discretion.
1.5 Terms used in this specification are defined in Terminology unless otherwise specified.
1.6 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A325 Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength
A325M Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength (Metric)
A490 Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength
A490M Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints (Metric)
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
F436 Specification for Hardened Steel Washers
F436M Specification for Hardened Steel Washers (Metric)
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F1789 Terminology for F16 Mechanical Fasteners
F1852 Specification for Twist Off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength
F2280 Specification for Twist Off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 150 ksi Minimum Tensile Strength
G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels
ASME StandardASMEB18.2.6 Fasteners for Use in Structural Applications
ICS Number Code 21.060.01 (Fasteners in general)
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ASTM F959-15, Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top