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ASTM-F2437 2014

ASTM-F2437 2014

$40.63

F2437-14 Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs

Published By Publication Date Number of Pages
ASTM 2014 6
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ASTM F2437-14

Historical Standard: Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs

ASTM F2437

Scope

1.1 This specification covers the requirements for carbon and alloy steel compressible-washer-type direct tension indicators capable of indicating a specified bolt tension in cap screws, bolts, anchors, and studs.

1.2 Direct tension indicators in nominal diameter sizes 1/4 through 21/2 in. are covered.

1.3 There are two Types of DTIs covered by this specification, Type 1 and Type 2.

1.3.1 Type 1 DTIs are suitable for comparatively large bearing surfaces. Type 1 DTIs are available in Grades 55 and 105, which differ in the amount of tension they indicate at a prescribed gap (see Table 1).

Note 1—Examples of a comparatively large bearing surface would include heavy hex bolts, heavy hex nuts, and so forth.
TABLE 1 Acceptable Range of Compression LoadA
A Compression load requirements establish the capability of the direct tension indicators to satisfy typical tension requirements for these grades. The user is not obliged to install fasteners and DTIs to these tensions, and is free to specify installation to lower tension values. When so specified, the DTI supplier shall provide a load-gap curve in accordance with 15.2 to enable the user to select the appropriate gap criteria for the intended target tension of the application.
B The Mean compression load values for Grades 5 and 8 in nominal sizes up through 1-1/2 in are based upon 75% of the proof load for SAE J429 cap screws. For Grade 5 in nominal sizes over 1-1/2 in and up to 2-1/2 in inclusive, the mean compression load values are based on 75% of the proof load for ASTM A449. For grade 8 in nominal sizes over 1-1/2 in and up to 2-1/2 in inclusive, mean compression load values are based upon 75 % of the proof load for ASTM A354BD.
C Mean compression load values for Grades 55 and 105 are based upon 60 % of the yield strength for the matching fasteners on which they are used.

1.3.2 Type 2 DTIs are suitable for comparatively smaller bearing surfaces.Type 2 DTIs are available in Grades 5 and 8, which differ in the amount of tension they indicate at a prescribed gap (see Table 1).

Note 2—Examples of a comparatively small bearing surface would include a hex cap screw, hex nut, and so forth.

1.4 Direct tension indicators are intended for installation under a bolt or cap screw head, a hex nut, or against a hardened washer or other flat hardened surface.

1.5 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 The following precautionary statement pertains only to the test method portions, Section 12 and Appendix XI 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.

Keywords

compressible-washer-type; direct tension indicators; DTI; load indicators; load indicating washers; tension indicators

ICS Code

ICS Number Code 21.060.01 (Fasteners in general)

DOI: 10.1520/F2437-14

ASTM-F2437 2014
$40.63