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Dayton 4Z857 helical gear speed reducer with keyed output shaft, hardened steel gears, ball bearings, 7.47 in tall

Dayton

Dayton 4Z857 Speed Reducer 57.5:1 Ratio 30 RPM Output .5 HP Input

SKU CH-0TSR-S14XM

A speed reducer with a 57.5:1 ratio delivers 30 RPM output from a .5 HP input and provides 998 in-lb of torque

  • 5:1 ratio delivers 30 RPM output for precise speed control
  • 5 HP input handles 998 in-lb torque for demanding loads
  • 885 lb overhung load capacity supports heavy radial forces
  • 5 in mount spacing fits standard industrial footprints
  • Hardened steel helical gears ensure quiet, durable power transmission

Speed Reducer for General Purpose Machinery

The Dayton 4Z857 is a helical gear speed reducer built for indoor or outdoor general purpose applications. It accepts up to .5 horsepower at 1,725 RPM input and delivers 30 RPM output through a keyed shaft. The unit mounts on a 4.5 inch center pattern with a 4.88 inch base to center height.

Practical Limits of Indirect Drive Helical Gearing

The indirect drive configuration and helical gear design require precise alignment to handle the rated 998 in-lb output torque. Overhung load capacity is limited to 885 lb on the output shaft. Maximum input speed is fixed at 1,725 RPM, so the reducer cannot be driven faster without exceeding design limits.

The 57.5:1 Ratio Determines Fit

A fixed 57.5:1 reduction ratio means output speed and torque are locked to the input motor specifications. Buyers who need a different output speed or torque profile cannot adjust this unit. The hardened steel gears and ball bearings suit continuous duty, but the ratio alone decides if it matches the drivetrain requirements.

Highlights

  • 5:1 ratio delivers 30 RPM output for precise speed control
  • 5 HP input handles 998 in-lb torque for demanding loads
  • 885 lb overhung load capacity supports heavy radial forces
  • 5 in mount spacing fits standard industrial footprints
  • Hardened steel helical gears ensure quiet, durable power transmission

Specifications

BrandDAYTON

Questions about this item

Should I choose the 57.5:1 ratio or a different gearbox for my application?

The 57.5:1 ratio gives 30 RPM output at 1,725 RPM input with 0.5 hp maximum input power and 998 in-lb output torque.

What does the 30 RPM output speed mean when the reducer is installed?

At the rated 1,725 RPM input the output shaft turns at 30 RPM, delivering up to 998 in-lb torque within the 0.5 hp input limit.

How does the indirect drive input connect and what speed does it cap?

The indirect drive input accepts up to 1,725 RPM; the helical gears and keyed output shaft transmit power at the fixed 57.5:1 ratio.

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