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Bettis IS-EA Series Quarter-turn Worm Gear Operator
A?robust, heavy-duty quarter-turn?worm gear?designed for electrical actuation.? This design is based on the AT-IS Series with ductile iron casing and alloy steel worm shafts.??
Bettis IS-EA Series Quarter-turn Worm Gear Operator


Power Source
Manual, Electric
Product Type
Worm Gear, Quarter-turn
Enclosure sealed IP67 (IP68 available upon request)
Control Type


  • 27 models´┐Żavailable up to 325,000 Nm torque and F-60 mounting base
  • Epoxy primer coating, and greased for life
  • Corrosion-resistant stainless steel 316´┐Żoption ideal for marine and highly corrosive environments, food and beverage applications, pharmaceutical, and sanitation facilities
  • Namur mounting available for limit switch box fitting
  • New ratios can be designed to meet any requirement
  • Standard input flanges (for actuator mounting) for ISO5211, MSS and DIN available
  • Worm shaft, fasteners and hand wheel material available in stainless steel 316
  • Worm wheel available in aluminum bronze