The S series slew product line features an hour glass worm providing increased gear contact and increased gear life. The S series is best suited for applications that require reaction of high static torque and have low output speeds (<1 RPM). The S series also features multiple backlash precision levels for increased positioning accuracy.

The W series features a ground cylindrical worm. The gear is made using proprietary materials and heat treat processes that provide improved gear life. The W series product is best suited for higher duty cycle and medium speed (<2.5 RPM) applications.