Precise measurement of the clamp load produced by a bolt or other
threaded fastener is now possible in the field with a new ultrasonic
stress measuring instrument from Norbar Torque Tools, the USM-II. Having
all the features of the USM-I, launched last year, the new
battery-powered, portable instrument can be taken to site and used at
locations where mains power is unavailable. Weighing just 1.7kg, the
USM-II is housed in an aluminium case with stainless steel end plates. It
features an alphanumeric membrane keypad that enables bolts to be
labelled by name rather than by code number.
While ultrasonic devices for measuring bolt length have been available
for some years, they have been costly and difficult to use, Norbar claims
that the USM-II’s advanced digital signal processing technique makes it
significantly easier to use and the price much more accessible.
Back to Fasteners and Adhesives October 2000
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