Tsubaki 50BB17H

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  • Obtain proper chain tension when either driving or driven shaft is not adjustable
  • Guide chain around an obstruction
  • Prevent whipping action in the slack span of chain
  • Bring about greater chain wrap around a small sprocket, particularly if it is the lower sprocket in a vertical drive
  • Take up slack chain caused by normal chain wear
  • Provide for reversed direction of rotation of a sprocket in contact with the outside of the chain


Bore Diameter0.638 in
Chain Size50
FinishBlack Oxide
Keyway Size3/16 x 3/32 in
Length Through Bore0.72 in
MaterialCarbon Steel
Number of Teeth17
Outside Diameter3.72 in
Pitch Diameter3.401 in
Screw Size1/4 in
TypeBall Bearing Type C


  • ISO 9001:2000
  • ISO 14001 Certified


Oil and Gas, Lumber, Mining, Primary Metals, Material Handling, Conveyor, Civil Engineering Projects, Machine Tool, Marine, Packaging Machinery, Pulp and Paper, Food Processing and Forestry

Additional Information

This type of sprocket is used in applications where the drive chain may experience slack due to long lengths, non-adjustability of the driven shaft or where the chain has to be guided around an obstruction. Use of idler sprockets prevents chain whipping and uneven distribution of load. This type of sprocket can also be used in applications where the drive chain may experience direction reversal or in applications where the chain may experience whipping. Having idler sprockets touching the outside of the chain would be beneficial.

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