A new series of RTX precision planetary gearheads from Sterling Instrument (ISO 9001:2000+AS9100B Registered Manufacturer) feature high torque design and are offered in standard NEMA sizes 60 and 90. These 36 gearheads, identified as the S9160AMRTX and the S9190AMRTX series feature single, double and triple gear stage configurations, optimized gear geometry, high torsional stiffness, captive, bearing supported input pinion and they are sealed to extend service life. Each of the two NEMA sizes are offered in gear ratios ranging from 4:1 to 700:1. Their maximum input speed is 6500 rpm. Their single stage, double stage and triple stage minimum efficiencies are 95 percent, 90 percent and 85 percent respectively. Operating temperatures range from -40 degrees C to +121 degrees C. The housings are made of stainless steel, with anodized aluminum mounting flanges. The output shafts are made of stainless steel and the gears are made of alloy and stainless steel. Quotes, online orders and 3-D CAD models are available at our updated eStore.