scope:

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 ½ through 1½ in., are covered:

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

1.2.2 Type 490 - direct tension indicators for use with A 490 bolts.

1.3 Direct tension indicators are intended for installation under either a bolt head or a hardened washer. (See Appendix X1.)

1.4 The following precautionary statement pertains only to the test method portions, Section 12, Annex A1, and Appendix X1, 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.