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Ultrasound

Acoustic vibration at a frequency that exceeds the upper limits of the human ear, between 20 kHz and a few tens of MHz Propagates very efficiently inside steel at frequencies of a few MHz

Transducer

Synonymous with an ultrasound probe or sensor.

Probe

Synonymous with an ultrasound transducer or sensor.

Tightening tension

Compression force applied between the assembled parts by the screw/bolt subjected to it by traction. Expressed in Newtons (N) or, more practically, kilo-Newtons (kN).     1 N = 0.1019 kgf.     1 kN = 101.9...

Over-tightening

Either the screw or assembled parts are warped (elastic threshold exceeded).