Shaft Collars

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2012 Shaft Collar Stock List

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Shaft Couplings

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Product Tables

Shaft Collars
Shaft Couplings
Flexible Beam


Fastening Hardware
Stick Slip
Torque Charts (Metal)
Torque Charts (Plastic)
Wrench Sizes
REACH Compliance
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Avoiding Coupling Failure
Getting a Hold on Shaft Collars
Rigid Collars for Motion Control
Shaft Couplings

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Oldham Couplings

Oldham couplings are three piece couplings comprised of two hubs and a center member. The center disk, which is available in a choice of acetal for high torsional stiffness or nylon for vibration and shock absorption, is the torque transmitting element.

Torque transmission is accomplished by mating slots in the center disk, located on opposite sides of the disk and oriented 90° degrees apart, with the drive tenons on the hubs. The slots of the disk fit on the tenons of the hub with a slight press fit. This press fit allows the coupling (with an acetal disk) to operate with zero backlash. While over time the sliding of the disk over the tenons will create wear and the coupling will cease to be zero backlash, the disk can be easily replaced and the coupling’s original performance restored. In operation, the center disk slides on the tenon of the hub to accommodate misalignment.

The disks are also electrically isolating and can act as a mechanical fuse. When the plastic insert fails, it breaks cleanly and does not allow any transmission of power, preventing other damage from occurring to more expensive machinery components.

This design is particularly well suited for handling relatively large amounts of parallel misalignment.


• Large parallel misalignment
• Electrically isolating
• Balanced design
• Replaceable disk

Product Specifications (Click a row for detailed specifications)

Product Range
OCT (Clamp) and OST (Set Screw) Series
Oldham Coupling - Inch
MOCT (Clamp) and MOST(Set Screw) Series
Oldham Coupling - Metric
OCC (Clamp) and OSC (Set Screw) Series
Oldham Coupling - With Keyway - Inch
MOCC (Clamp) and MOSC(Set Screw) Series
Oldham Coupling - With Keyway - Metric
Oldham Couplings
Technical Information and Part Nomenclature

For additional information on shaft couplings, please see the following technical article entitled "What to Look For in Shaft Couplings" made available on the RotoPrecision website courtesy of Ruland.

For additional technical product and ordering information,
please contact Application Support.


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