Polyurethane O-Rings

Polyurethane O-rings, also known as polyurethane, urethane, or O-ring belts, are the industry standard for most motor pulley to shaft applications. Poly O-rings are used as a driving factor on many different machines, including, but not limited to: line shaft conveyors, robotics, engravers, roller-to-roller conveyors and transfers, pop-up diverters, sorters, laundry machines, tire manufacturing, and printing machines.

There are three common methods to determine the O-ring size you need.

Method One: Cut Length (Measuring of Prewelded/Endless Polyurethane)

  • Cut your NEW, UNUSED O-ring
  • Measure the length of the cut O-ring against a ruler
  • Measure the thickness of the cut O-ring
  • Analyze the color of the cut O-ring (this helps determine O-ring durometer)

 

Method Two: Application Measurement (Measuring of Conveyor Line Shaft)

  • Measure from the roller, around the groove of the spool (on line shaft), and back to the roller.
  • Multiply this length by .90 (this gives you your cut length)
  • Measure the thickness of the O-ring
  • Analyze the color of the cut O-ring (this helps determine O-ring durometer)

 

Method Three: From a Twisted O-Ring Length

  • From a poly twisted O-ring length add 7%
Polycord
Polycord

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