Torque Testing

Occasionally referred to as torsion testing, torque testing is used to determine performance characteristics of a sample component for either material qualification or failure analysis purposes.

The association between tension and torque should be considered carefully, since it is quite hard to specify the variation of conditions of a fastener. The amount of the twisting force necessary to rotate the nut along the bolt threads is known as torque, however tension is the elongation or elasticity of a fastener that provides the holding force of a joint.

Fasteners are intended to stretch or give slightly, and the clamping load that develops during this elastic elongation is what makes the joints lock together. Torque is an incidental indication of tension, as many factors can disturb this association, such as texture of the mating surfaces, oils, rubbish, thread series, rust and material type, for instance. Almost all tables about the torque/tension relationship that have been established, including ours, are based on the following formula:
T = (K D P)/12

Frequently Tested Materials and Products

  • Metals
  • Fasteners
  • Rebar
  • Metal Wire
  • Pipes
  • Plastics
  • Rubber
  • Composites
  • Tubes
  • Welds

Popular Test Standard

Standard Test Methods and Definitions for Mechanical Testing of Steel Products — ASTM A370

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