• ASTM F2437-12

ASTM F2437-12

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

ASTM International , 04/01/2012

Publisher: ASTM

File Format: PDF

$29.00$58.00


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.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 LoadA

DTI
Nominal
Diameter
(in.)

Mean Compression LoadB Range
in Pounds (lbs)

Mean Compression LoadC 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

10100 to 11200

...

...

1/2

9700 to 10700

13700 to 15340

4450 to 4900

8500 to 9400

9/16

12350 to 13600

17400 to 19200

5700 to 6300

10900 to 12050

5/8

15550 to 17200

21850 to 24200

7050 to 7800

13500 to 15000

³/4

22600 to 25000

31900 to 35300

10500 to 11600

20000 to 22150

7/8

30850 to 34100

43550 to 48100

14500 to 16000

27650 to 30550

1

40200 to 44400

56700 to 62700

19000 to 21000

36250 to 40100

11/8

45,100 to 49850

73150 to 80900

23950 to 26450

47300 to 52300

11/4

56550 to 62550

91750 to 101450

30400 to 33600

59850 to 66150

1³/8

69350 to 79750

112450 to 124250

38550 to 42600

73800 to 81600

11/2

83350 to 92150

135150 to 149400

44050 to 48700

89300 to 98700

15/8

...

...

55800 to 61700

106200 to 117400

1³/4

121850 to 134650

177850 to 196500

59550 to 65850

124600 to 137750

17/8

154550 to 170800

206050 to 227750

75550 to 83500

144500 to 159700

2

160050 to 177200

236850 to 261750

78 650 to 86 950

165800 to 183300

21/4

208400 to 230350

277900 to 307100

102050 to 112750

212900 to 235350

21/2

256500 to 283500

379600 to 419600

125400 to 138600

240550 to 265850

ACompression 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.
BMean compression load values for Grades 5 and 8 are based upon 75% of the proof load for SAE J429 cap screws.
CMean 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.

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