ASTM-F2437 2012

$40.63

F2437-12 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	2012	6

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Categories: 21.060.01 - Fasteners in general, ASTM

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Description

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 2 ¹ / 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. ² 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 ).

TABLE 1 Acceptable Range of Compression Load ^A

^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 Mean compression load values for Grades 5 and 8 are based upon 75?% of the proof load for SAE J429 cap screws.

^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. ³ 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 ).

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 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.

Additional information

1 1 / 4	56?550 to 62?550
1 / 4	2200 to 2450
1 / 2	9700 to 10?700
2 1 / 4	208?400 to 230?350
2	160?050 to 177?200
1	40?200 to 44?400
2 1 / 2	256?500 to 283?500
1 7 / 8	154?550 to 170?800
1 3 / 4	121?850 to 134?650
1 1 / 2	83?350 to 92?150
7 / 16	7200 to 7900
1 5 / 8	.?.?.
3 / 4	22?600 to 25?000
7 / 8	30?850 to 34?100
5 / 16	3500 to 3850
1 1 / 8	45,?100 to 49?850
3 / 8	5300 to 5850
DTI Nominal Diameter (in.)	Mean Compression Load B Range in Pounds (lbs)
5 / 8	15?550 to 17?200
Grade 5	Grade 8
1 3 / 8	69?350 to 79?750
9 / 16	12?350 to 13?600
ICS Codes	21.060.01 - Fasteners in general

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ASTM-F2437 2012

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