One Way Clutch

Two types of Polyclutch® brand one-way clutches are available: the Hub-Pak and Shell-Pak


  • Freewheeling one way clutch with a maximum capacity of 12 pound inches.
  • Installation should be designed so that all extraneous loads are taken through the housing journal, not through the Hub-Pak. A knurled press fit or pin can be used to secure the cartridge to the shaft.
  • Limited to .250 dia shaft.
  • Direction of drive must be specified at time of order


  • A light duty (8 pound inch capacity), economical, fully journaled clutch, for use when axial space is at a minimum, but long life is paramount.
  • The Polyclutch Shell-Pak is a fully automatic over-running clutch that has some very interesting features.
  • It is a complete and self contained operating unit with the outer housing and cam member combined into a one piece precision shell. The inner hub and spring loaded locking rolls are assembled with the shell to complete the assembly. The fully journaled outer shell needs no additional radial bearing for normal applications.
  • Four shell configurations are offered in the Type 92 Single Shell-Paks series. Two single shells can be combined in any combination to create the Type 98 Duplex Assembly. This extremely flexible feature allows many design options.

Hub-Pak Specs

Cartridge No. Capacity lb-in Max. Drive Rolls Use Race Dia. A AA B C D E F
G30-4 7 4 .6265/0.6245 0.375 n/a 0.25 0.015 n/a n/a n/a
E31-4 (L OR R) 12 4 .6265/0.6245 n/a 0.5 0.25 0.015 0.062 0.062 0.312
E33-4 (L OR R) 18 4 .6265/0.6245 n/a 0.5 0.25 0.015 0.062 0.062 0.312

G30 Press fit onto shaft. E31 and E33 match drill and pin to shaft. E31 and E33-specify left or right drive. Right Drive: Hub pak drives housing clockwise when viewed from extension end of cartridge. Left Drive: Hub pak drives housing counter-clockwise when viewed from extension end of cartridge.

Housing No. G H I J K L M N R  (Race)
GQ306-4 0.422 0.375 0.906 0.531 0.514 0.75 0.032 0.022 .6265/ 0.6245

Shell-Pak Specs

  • Right Drive: Shell drives hub clockwise when viewed from extension end of hub.
  • Torque capacity 8 lb-in.
  • Dimension B = 0.250 (Bore diameter)
  • Dimension D = 0.0625 (Pin diameter)

Relevant Resources

Contact Us Or Ask a Question

Want to speak with our Polyclutch experts? Call us at (262) 786-1500.

  • If this is a request for quote, we'll need your full address. Please include that in the message box above. Thank you.

Want to speak with our experts?

Call us at (262) 786-1500