ASTM F959-05a - 1.4.2005
 
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 diameter sizes 1/2 through 11/2 in. are covered:

1.2.1 Type 325direct tension indicators for use with Specification A 325 bolts, and

1.2.2 Type 490direct 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.)

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

A325M-14

Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength (Metric) (Withdrawn 2016)

Specification for Structural Joints Using HighStrength Bolts

G101-04(2020)

Standard Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels

F2280-14

Standard Specification for “Twist Off” Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 150 ksi Minimum Tensile Strength (Withdrawn 2016)

F1852-14

Standard Specification for “Twist Off” Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength (Withdrawn 2016)

F1789-23

Standard Terminology for F16 Mechanical Fasteners

F1470-24

Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

F606/F606M-21

Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

ASMEB18.2.6

Fasteners for Use in Structural Applications

A490-14

Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength

A325-14

Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength (Withdrawn 2016)

A490M-14

Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints (Metric)

B695-21

Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel

F436-11

Standard Specification for Hardened Steel Washers

F436M-11

Standard Specification for Hardened Steel Washers [Metric] (Withdrawn 2016)