ASTM F2437

CARBON AND ALLOY STEEL COMPRSSIBL-WASHER-TYPE DIRECT TENSION INDICATORS FOR USE WITH CAP SCREWS, BOLTS, ANCHORS, AND STUDS

English 2006
0.000
ASTM
Detailed Information

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. 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).
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).
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.

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