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Boston GearRF721-20-B5-G

RF721-20-B5-G

700 Series C-Face Coupled Reducer
Item #101870211
  • 2 1/16" Center Distance
  • 20:1 Ratio
  • 56C Frame
  • C-Face Coupled Input
  • Left Output
  • Universal Worm Position
  • No Lubricant
  • Cast Iron
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Boston GearRF721-20-B5-G
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    Shipment Options
  • 2 1/16" Center Distance
  • 20:1 Ratio
  • 56C Frame
  • C-Face Coupled Input
  • Left Output

features

  • Large oil reservoir provides efficient heat dissipation and lubrication for longer life
  • Housing is straddle milled top and bottom for precise alignment
  • Internal baffles ensure positive, leak-free venting
  • Rugged housing fabricated of fine-grained cast iron for maximum strength and greater precision during worm and gear alignment
  • Bronze worm gear is straddle mounted between heavy-duty tapered roller bearings to increase thrust and load capacities on size 713 to 760
  • High strength steel output shaft ensures capacity for high torque
  • Pipe plugs allow easy fill, level and drain in any mounting position
  • Super finished oil seal diameters on both input and output shafts extend seal life

caution

  • Must be filled to the proper level with the recommended lubricant for your application before operation
Shaft Assembly Code G
Frame Size 56C
Bolt Centers w/ Vertical "J" Base Kit (in) 8.63 x 2.63
Fan Cooled No
Frame 56C
Bolt Centers w/ Std. Base Kit (in) 6 3/8 x 4 11/16
Lubrication None
Base to Shaft Center Height w/Std. Base Kit 4.81 in
Thermal Input Horsepower @ 1750 RPM N/A
Use With 721
Center Distance 2 1/16 in
Output RPM @ Input RPM 88 rpm @ 1750 rpm
Washdown Duty No
Output Torque @ RPM 782 in lb @ 1150 rpm, 892 in lb @ 1750 rpm
Output RPM @ 1750 rpm Input 87.5 rpm
Max. Thrust Load @ RPM 700 lb/in @ 1150 rpm, 700 lb/in @ 1750 rpm
Housing Material Cast Iron
Family Name RF
Max. Thrust Load @ 1150 rpm 700 lb/in
Output (Shaft or Bore) Size 1 in
Box Width 5 3/16 in
Base to Shaft Center Height w/Low Vert. Base Kit 3.13 in
Reduction Type Single Reduction
Base to Shaft Center Height w/High Vert. Base Kit 4.88 in
Output Configuration Left Output
Base to Centerline of Output Shaft 2 9/32 in
HP @ RPM 1 hp @ 1800 rpm
Input Configuration C-Face Coupled
Max. Input HP @ 100 rpm 0.11 hp
Base to Shaft Center Height w/Vert. "J" Base Kit 3.94 in
Ratio 20:1
Bolt Center Length x Bolt Center Width 5 in x 2 7/8 in
Bolt Center 5 in x 2 7/8 in
Bolt Centers w/ Vertical Base Kits (in) 8 3/8 x 4 7/8
Max. Overhung Load @ 1750 rpm 700 lb/in
Motor Application General Purpose
Box Height 6 3/8 in
Input (Shaft or Bore) Size 5/8 in
Box Length 6 in
Torque Out @ 1750 rpm 892 in lb
Base to Centerline of Input Shaft 4 11/32 in
Keyway Size 3/16 x 3/32
Torque Out @ 1150 rpm 782 in lb
Max. Overhung Load @ RPM 700 lb/in @ 1150 rpm, 700 lb/in @ 1750 rpm
Bore Code B5
Motor HP 1 hp
Worm Position Universal
Input HP @ RPM 0.86 hp @ 1150 rpm, 1.4 hp @ 1750 rpm
Weight 36.1 LB
EAN or UPC 781711527047
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