ASTM F2437/F2437M-17,Standard Specification for Carbon and Alloy Steel Compressible-Washer-Type Direct Tension Indicators for Use with Cap Screws, Bolts, Anchors, and Studs.
ASTM F2437/F2437M-17 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, bolts, anchors, and studs.
5. Materials and Manufacture
5.1 Direct tension indicators shall have a configuration produced by extrusion, punching, pressing, or similar forming to permit a measurable decrease in thickness when placed incompression.
5.2 The design shall be such that the degree of plastic deformation of the protrusions shall indicate the tension in a tightened cap screw, bolt, anchor, or stud.
5.3.1 The heat treatment of DTIs is optional at the manufacturer’s discretion, provided the DTIs meet all of the mechanical and performance requirements.
5.3.2 When heat treatment is performed, the process shall be through-hardening by heating to a temperature above the upper transformation temperature, quenching in a liquid medium, and tempering by heating to a suitable temperature.
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