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Cast iron worm gear speed reducer with C-face input, 30:1 ratio, 1.5 hp

Boston Gear

Boston Gear F726-30-B7-G Transmission Fluid 30:1 Ratio 1.5 hp 1247 in-lb

SKU CH-5T1S-EEA38

Worm speed reducer with a 30:1 ratio delivers 1.5 hp and 1247 in-lb output torque at 58 RPM maximum speed

  • 30:1 ratio delivers precise speed reduction for controlled motion
  • 5 hp input power handles demanding industrial applications
  • 1247 in-lb output torque provides strong rotational force
  • 58 RPM maximum output speed suits low-speed high-torque needs
  • Cast iron housing with tapered roller bearings ensures durable operation

Boston Gear F726-30-B7-G Speed Reducer

The Boston Gear F726-30-B7-G is a worm-gear speed reducer designed for industrial power transmission. It accepts a C-face motor in frame sizes 140TC or 180C and delivers a fixed 30:1 reduction ratio. The cast-iron housing mounts at any angle and uses tapered roller bearings for load support. It suits OEMs and maintenance teams replacing a unit with identical mounting and ratio requirements.

Operational Limits of the 30:1 Ratio

At the 30:1 ratio the maximum output speed is 58 RPM when driven at standard motor speeds. The unit handles up to 1.5 hp input and produces a maximum output torque of 1247 in-lb. Overhung load capacity is rated at 150 lb on the output shaft. The worm center distance is 2.62 in and the base-to-center height is 2.94 in. These fixed limits define the operating envelope; applications exceeding any value will require a different reducer.

Single Specification for Selection

The gear ratio of 30:1 is the primary parameter that determines whether this reducer matches the drivetrain design. Output speed, torque and overhung load all derive from this ratio combined with the motor frame and input power. Verify that 30:1, 58 RPM maximum output and 1247 in-lb torque align with the machine specifications before ordering.

Highlights

  • 30:1 ratio delivers precise speed reduction for controlled motion
  • 5 hp input power handles demanding industrial applications
  • 1247 in-lb output torque provides strong rotational force
  • 58 RPM maximum output speed suits low-speed high-torque needs
  • Cast iron housing with tapered roller bearings ensures durable operation

Specifications

BrandBOSTON GEAR

Questions about this item

Which gear ratio matches the 30:1 reducer with 1.5 hp input and 1247 in-lb output?

The 30:1 ratio is the only one listed for this C-face speed reducer; it delivers up to 1.5 hp input and 1247 in-lb output torque.

What does the 58 RPM maximum output speed mean when the reducer is driven at full 1.5 hp?

At full 1.5 hp input the output shaft turns no faster than 58 RPM, giving the 1247 in-lb torque rating at that speed.

How does the 140TC/180C C-face mounting interface limit the motor size I can use?

The C-face accepts NEMA 140TC and 180C frame motors, so any motor outside those frame designations will not bolt directly to this reducer.

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