ASTM F959 Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners
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- ASTM F959 Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners
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ASTM International
Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners
N F959
Annotation
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.
Eight types of DTIs in nominal diameter sizes1 2 through 11 2 in. as well as M16 through M36 are covered:
Type 325-1—DTIs for use with Specification A325 Type 1 bolts or F or F1852 assemblies.
Type 325–3—DTIs for use with Specification A325 Type 3 bolts or F1852 Type 3 assemblies.
Type 490–1—DTIs for use with Specification A490 Type 1 bolts or F2280 assemblies.
Type 490–3—DTIs for use with Specification A490 Type 3 F2280 Type 3 assemblies.
Type 8.8-1—DTIs for use with Specification A325M Type 1 bolts.
Type 8.8-3—DTIs for use with Specification A325M Type 3 bolts.
Type 10.9-1—DTIs for use with Specification A490M Type 1 bolts.
Type 10.9-3—DTIs for use with Specification A490M Type 3 bolts.
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.)
This specification provides for furnishing Type 3 DTIs to a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the manufacturer’s discretion.
