PowerAcT trapezoidal screws from Nook Industries have
centralizing threads that maintain alignment of the
thread axis. The screws are manufactured in accordance
with ISO standards. "We are finding more customers designing
with global sales in mind, so they are asking for metrics,"
says Rick Christyson, chief engineer at Nook. The company
offers eight sizes from 10 to 65 mm. The screws are
accurate to within ±0.1 mm per 300-mm lead. "The screw's
threads are made with a 30Ί angle. We make the nuts
to match, so there is no wedging or binding. Keeping
the tolerances tight also lowers the friction and extends
the life of the products," says Christyson. Plastic
and bronze nuts are matched with screw capacities. Customers
choose trapezoidal screws made from stainless steel
for food and medical applications or high-carbon 4140
alloy steel for machine tool, packaging, and other industrial
applications. PowerAc screws are compatible with the
company's EZZE-MOUNTT bearing supports for 16-, 20-,
26-, 40-, 55-, and 65-mm universal face/foot-mount bearing
supports and 16-, 20-, 26-, 40-, and 55-mm flange-mount
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