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Boston GearSRF721-20-B5-G

SRF721-20-B5-G

700 Series C-Face Coupled, Hollow Output Reducer
Item #102859050
  • 2 1/16" Center Distance
  • 20:1 Ratio
  • 56C Frame
  • C-Face Coupled Input
  • Hollow Output
  • Universal Worm Position
  • No Lubricant
  • Cast Iron
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Boston GearSRF721-20-B5-G
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    Shipment Options
  • 2 1/16" Center Distance
  • 20:1 Ratio
  • 56C Frame
  • C-Face Coupled Input
  • Hollow 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
Bolt Centers w/ Vertical "J" Base Kit (in) 8.63 x 2.63
Frame 56C
Ratio 20:1
Input Configuration C-Face Coupled
Torque Out @ 1150 rpm 782 in lb
Worm Position Universal
Base to Centerline of Output Shaft 2.28125 in
Max. Overhung Load @ RPM 700 lb/in @ 1150 rpm, 700 lb/in @ 1750 rpm
Base to Centerline of Input Shaft 4.34375 in
Motor HP 1 hp
Shaft Assembly Code G
Washdown Duty No
Center Distance 2 1/16 in
Bore Code B5
Output (Shaft or Bore) Size 1 1/8 in
Fan Cooled No
Family Name SRF
Input (Shaft or Bore) Size 5/8 in
Box Length 6 in
Base to Shaft Center Height w/Low Vert. Base Kit 3.13 in
Use With 721
Motor Application General Purpose
Output Torque @ RPM 782 in lb @ 1150 rpm, 892 in lb @ 1750 rpm
Box Height 6 3/8 in
Keyway Size 3/16 x 3/32
Housing Material Cast Iron
Lubrication None
Input HP @ RPM 0.86 hp @ 1150 rpm, 1.4 hp @ 1750 rpm
HP @ RPM 1 hp @ 1800 rpm
Bolt Center 5 in x 2 7/8 in
Output RPM @ Input RPM 88 rpm @ 1750 rpm
Frame Size 56C
Max. Input HP @ 100 rpm 0.11 hp
Base to Shaft Center Height w/Std. Base Kit 4.81 in
Max. Thrust Load @ 1150 rpm 700 lb/in
Thermal Input Horsepower @ 1750 RPM N/A
Torque Out @ 1750 rpm 892 in lb
Max. Overhung Load @ 1750 rpm 700 lb/in
Output RPM @ 1750 rpm Input 87.5 rpm
Output Configuration Hollow Output
Bolt Centers w/ Std. Base Kit (in) 6 3/8 x 4 11/16
Box Width 4 1/8 in
Bolt Centers w/ Vertical Base Kits (in) 8 3/8 x 4 7/8
Base to Shaft Center Height w/High Vert. Base Kit 4.88 in
Base to Shaft Center Height w/Vert. "J" Base Kit 3.94 in
Reduction Type Single Reduction
Max. Thrust Load @ RPM 700 lb/in @ 1150 rpm, 700 lb/in @ 1750 rpm
Weight 38.1 LB
EAN or UPC 884107226538
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