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Bolt Load Inspection (EMAT)

Measurement of bolt-load by comparing variations in ultrasonic Time-Of-Flight corresponding to changes in bolt elongation (strain). Single (SH) wave and double (SH + L) wave sensors available to meet different requirements.
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Shear Horizontal conical wave permits measurement of strain on any type of bolt (regardless of bolt end) and metallic material. Double-wave technique uses Shear Horizontal and Longitudinal waves to measure elongation on bolts in-situ that cannot be removed from the structure.


  • Non-contact EMAT ultrasonic bolt testing technique.
  • EMAT sensors do not mechanically load the surface under test allowing a greater precision of measurement of ultrasonic arrival time variation.
  • Capable of working on non-flat bolt heads and bottoms.
  • Double wave technique (using SH and L wave sensor) permits ultrasonic bolt load measurement without knowing the original length of the bolt.
  • Custom ultrasonic bolt testing software provides actual load readings (MPa or PSI).

Software Upgrades

  • Bolt-Load Measurement

Related Instruments

The following instruments are recommended for this application.


Standard EMAT and DCUT Sensors and Accessories for the most common applications (normal beam, guided waves, angled beam)

If you would like any more information on this system, please contact us, and one of our experts will be in touch.