Bolt Tension Monitors
The MINI-MAX and MAX II Ultrasonic Bolt Tension Monitors define the state of the art in the measurement of the actual elongation produced by tightening a threaded fastener. They can very accurately measure the elongation of fasteners of most material types. The measurement is achieved by determining the change in the transit time of an ultrasonic wave along the length of the fastener as the fastener is tightened. The on-board microcomputer automatically interprets this time measurement to display the time (nanoseconds), elongation, load, stress, or % strain from stretching a fastener.