ASTM F959

COMPRESSIBLE-WASHER-TYPE DIRECT TENSION INDICATORS FOR USE WITH STRUCTURAL FASTENERS

English 2009
0.000
ASTM
Detailed Information

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 Four 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 A325 Type 1 bolts or F or F1852 assemblies.
1.2.2 Type 325-3-direct tension indicators for use with Specification A325 Type 3 or F1852 Type 3 assemblies.
1.2.3 Type 490-direct tension indicators for use with Specification A490 Type 1 bolts or F2280 assemblies.
1.2.4 Type 490-3-direct tension indicators for use with Specification A490 Type 3 F2280 Type 3 assemblies.
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 A325 or A490 Bolts.)
1.4 This specification provides for furnishing Types 325-3 and 490-3 to a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the supplier’s option.

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