Profile: S T D Precision Gear & Instrument, Inc offers high precision, complexly configured, tightly toleranced gears, splines and other related mechanical transmission components. We produce products qualified for critical applications such as NASA's International space station, the Hubble telescope, Boeing aircraft, and the U.S. army TACOMS missile. Our precision gear products include spur gears, helical gears, worm gears, anti-backlash gears, cluster gears, clutch gears, face gears, planetary gears, gear assemblies, gear boxes, bevel gears, miter gears, metric gears, internal gears, idler gears, gear rack and pinion, worms, wormshafts, splines, spline shafts, se shafts. Pulleys and sprockets- timing belt pulleys, grooved pulleys, film ssrockets, rollerchain sprockets, ladderchain sprockets, silentchain sprockets and gates polychain.