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White nylon Oldham coupling disc with three lobes and centre hole

Ruland Manufacturing

Ruland Manufacturing OD21/33-NL Oldham Coupling Disc

SKU CH-C11Z-B39S6

Nylon Oldham coupling disc compensates 0.5 degree angular and 0.008 inch parallel misalignment at up to 4,500 RPM

  • TypeCouplings, Collars & Adapters
  • Handles 0.5° angular misalignment for smooth motion transfer
  • Accommodates 0.008 in parallel offset to reduce shaft stress
  • Allows 0.006 in axial motion for thermal expansion
  • Nylon 11 disc delivers 18 in-lb max torque at 4,500 RPM
  • 1-5/16 in OD fits 1-21/64 in hub diameter

Ruland OD21/33-NL Oldham Coupling Disc

This new Oldham coupling disc from Ruland Manufacturing transmits motion between two shafts while accommodating misalignment. It suits maintenance engineers and machine builders who need a replaceable disc for existing OD21/33 hub assemblies in light-duty power-transmission systems.

Replaces worn or damaged nylon discs

Swap the disc when the original shows cracking, excessive play or lost torsional stiffness. The jump is worth it when parallel misalignment reaches the 0.008 in limit or angular drift approaches 0.5 degrees, restoring the 18 in-lb torque rating and 19.2 in-lb/deg stiffness without replacing the hubs.

Fits 1 21/64 in hub diameter, inch-series drives

Buyers needing metric bores, higher speeds than 4,500 RPM or torque above 18 in-lb should look at other coupling types. The nylon 11 disc also carries a California Proposition 65 warning for cancer and reproductive-harm chemicals, so users requiring RoHS-compliant materials must select an alternative.

Highlights

  • Handles 0.5° angular misalignment for smooth motion transfer
  • Accommodates 0.008 in parallel offset to reduce shaft stress
  • Allows 0.006 in axial motion for thermal expansion
  • Nylon 11 disc delivers 18 in-lb max torque at 4,500 RPM
  • 1-5/16 in OD fits 1-21/64 in hub diameter

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

Will the 1 5/16 in outside diameter and 1 21/64 in hub diameter fit my shaft spacing?

The disc outside diameter is 1 5/16 in and it is made for a hub diameter of 1 21/64 in; verify both dimensions against your shaft centre distance before ordering.

What is the correct way to seat the nylon disc between the two hubs without binding?

Align the hub slots with the disc tenons, press the disc fully into both hubs so it floats freely, then torque the set screws to the hub manufacturer's spec; the common error is leaving a gap that lets the disc walk out under load.

When should I replace the nylon disc given the 18 in-lb maximum torque and 300 in-lb break torque ratings?

Replace the disc if you see cracking, excessive wear on the tenons, or if the coupling exceeds 0.5 degrees angular or 0.008 in parallel misalignment during inspection, as these indicate the nylon has fatigued beyond its 18 in-lb continuous rating.

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