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Ultrasonic Bolt Measurement

With accuracy rivaling that of strain-gauges, the USM-3, Ultrasonic Bolt Meter, defines the state of the art in the measurement of the actual clamp load produced by tightening a threaded fastener. The USM-3 can measure fastener elongation or the resulting load, very accurately in fasteners of virtually any material from 1/2 inch to over 50 feet in length.

The USM-3 allows up to 30 hours field operation from 4 'C' cell alkaline batteries.

The measurement is achieved by determining the change in the transit time, of an ultrasonic shock wave along the length of the fastener as the fastener is tightened by any method. The on-board microcomputer automatically interprets this time measurement to display the elongation or load in the fastener. Through the use of high speed digital signal processing and automated diagnostics, the USM-3 minimizes the requirements for extensive operator training.

Ultrasonic Stress Meter - USM

Ultrasonic Stress Meter - USM

MagneticTransducers are used with magnetic alloys, and consist of a rare earth magnet surrounding a piezo electric crystal which is protected by a wear plate. The diameter used in the description of transducers refers to the nominal diameter of the piezo electric crystal; therefore, the O.D. of a transducer is larger than the crystal diameter due to the annular magnet and transducer housing. Standard transducers can be used on application with contact temperatures of up to 54°C (130°F). Hi-Temp transducers are available for applications with contact temperatures of up to 175°C (350°F). Special transducers are available for non-magnetic applications.

USM Transducers

USM Transducers

Transducer cables are available in a variety of lengths from 10' to 50' long. Like transducers, transducer cables come in both standard and Hi-Temp versions.

USM Cables

USM Cables

Spares and accessories for Norbar Ultrasonic Stress Meter (USM).

USM Ancillaries

USM Ancillaries