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Boston Gear F71850KB5J Right Angle Gearbox, NEMA 56C Flange Input, Left Output, 50:1 Ratio, 1.75" Center Distance, .44 HP and 573 in-lbs Output Torque at 1750 RPM

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Specifications for this item
Number of Items
Axial Load Capacity
500  pounds
Material Type
Cast Iron
Part Number
Item Weight
22 pounds
Size Name
NEMA 56C Flange Input, Left Output, 50:1 Ratio, 1.75" Center Distance
Brand Name
Boston Gear
Upper Temperature Range
275  Degrees Fahrenheit
Max Rotational Speed
3600  RPM
Exterior Finish
Style Name
.44 HP and 573 in-lbs Output Torque at 1750 RPM
LowerTemperature Range
-20  Degrees Fahrenheit

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Key Features

  • Boston Gear F71850KB5J gearbox, 50:1 ratio, 1.75" center distance rated for .44 HP @ 1750 RPM input at service class 1
  • Output Torque capacity is 573 inch lbs at 1750 RPM input speed with NEMA 56C flange input
  • Precision ground gearing provides smooth, quiet operation for maximum life and high power density
  • Compact, high reduction gearbox with NEMA flanged input and rugged cast iron housing
  • High strength "stress proof" steel output shaft supported by oversize tapered roller bearings
  • Gearbox is supplied pre-lubricated with Boston Gear UH16460 lubricant for maximum torque capacity

Package Details

Shipping Weight: 21.75 pounds
Package Size: 10 x 9.8 x 9.7 inches

Product Description

Gearbox is pre-lubricated for mounting position #1 but other mounting positions may require additional oil. The load ratings are based on Boston Gear UH16460 lubrication filled to the proper level. The maintenance/installation manual can be found in the literature section at and will be included with each gearbox. Cad models 2D and 3D can be downloaded from BostSpec2 at Please see the Boston Gear enclosed gearing catalog P-1485 for alternate shafting and mounting configurations.

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