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# ASTM International - ASTM F2437-14

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

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 Organization: ASTM International Publication Date: 1 June 2014 Status: inactive Page Count: 6 ICS Code (Fasteners in general): 21.060.01
##### 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

 DTI Nominal Diameter (in.) Mean Compression Load B Range in Pounds (lbs) Mean Compression Load C Range in Pounds (lbs) Grade 5 Grade 8 Grade 55 Grade 105 1/4 2200 to 2450 3100 to 3450 . . . . . . 5/16 3500 to 3850 4950 to 5500 . . . . . . 3/8 5300 to 5850 7500 to 8300 . . . . . . 7/16 7200 to 7900 10 100 to 11 200 . . . . . . 1/2 9700 to 10 700 13 700 to 15 340 4450 to 4900 8500 to 9400 9/16 12 350 to 13 600 17 400 to 19 200 5700 to 6300 10 900 to 12 050 5/8 15 550 to 17 200 21 850 to 24 200 7050 to 7800 13 500 to 15 000 3/4 22 600 to 25 000 31 900 to 35 300 10 500 to 11 600 20 000 to 22 150 7/8 30 850 to 34 100 43 550 to 48 100 14 500 to 16 000 27 650 to 30 550 1 40 200 to 44 400 56 700 to 62 700 19 000 to 21 000 36 250 to 40 100 1 1/8 40 250 to 44 450 73 150 to 80 900 23 950 to 26 450 47 300 to 52 300 1 1/4 51 100 to 56 450 91 750 to 101 450 30 400 to 33 600 59 850 to 66 150 1 3/8 61 150 to 67 600 112 450 to 124 250 38 550 to 42 600 73 800 to 81 600 1 1/2 74 350 to 82 150 135 150 to 149 400 44 050 to 48 700 89 300 to 98 700 1 5/8 . . . . . . 55 800 to 61 700 106 200 to 117 400 1 3/4 74 450 to 82 300 177 850 to 196 500 59 550 to 65 850 124 600 to 137 750 1 7/8 ... 206 050 to 227 750 75 550 to 83 500 144 500 to 159 700 2 98 000 to 108 300 236 850 to 261 750 78 650 to 86 950 165 800 to 183 300 2 1/4 127 400 to 140 800 277 900 to 307 100 102 050 to 112 750 212 900 to 235 350 2 1/2 156 750 to 173 250 379 600 to 419 600 125 400 to 138 600 240 550 to 265 850

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.

##### abstract:

This specification covers the requirements for carbon and alloy steel compressible-washer-type direct tension indicators (DTIs) capable of indicating a specified bolt tension in cap screws,... View More

### Document History

ASTM F2437-14
June 1, 2014
Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs
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,...
April 1, 2012
Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs
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,...
May 1, 2011
Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs
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,...
August 15, 2006
Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs
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,...
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