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ASTM International , 04/01/2012
Publisher: ASTM
File Format: PDF
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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).
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
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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