Polyurethane O-Rings

Polyurethane O-rings, also known as polyurethane, urethane,  O-ring belts, or O-ring drive belts are the industry standard for most motor pulley to shaft applications. These mostly include conveyor systems in large distribution centers. 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%

 

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