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Metal coupling hub, 64 mm diameter, 28 mm bore, keyway, set screw

Lovejoy

Lovejoy L100 28 mm Jaw Coupling Hub

SKU CH-4EWY-KEY89

Jaw coupling hub with 28 mm bore and keyway for power transmission up to 7,000 RPM

  • 28 mm bore fits standard metric shafts
  • Carbon steel hub handles 7,000 RPM operation
  • Buna-N spider delivers 0.66 hp at 100 RPM
  • Urethane spider provides 1 hp at 100 RPM
  • Hytrel spider supports 1.8 hp at 100 RPM

Coupling Hub for 28 mm Shafts

The Lovejoy L100 hub fits a 28 mm round bore with an 8 mm keyway and set-screw locking. It is made from carbon steel and rated to 7,000 RPM for power-transmission applications. The hub works with L100 Buna-N, Urethane or Hytrel centre elements. Buyers needing a different bore size or a clamp-style lock will need another hub.

Thermal and Power Behaviour

The hub transmits up to 0.66 hp at 100 RPM with a Buna-N spider, 1 hp with Urethane and 1.8 hp with Hytrel. Carbon-steel construction dissipates heat through the shaft and spider interface during continuous operation. No active cooling or lubrication is required. Installations exceeding the rated speed or torque should use a larger coupling size.

Supplied Hardware and Compatibility

The hub is sold as a single component; centre element and second hub are purchased separately. It accepts manufacturer part numbers L100H, L100N and L100U for the flexible spider. No software, mounting bolts or alignment tools are included. Users must source the matching spider and counter-hub to complete the assembly.

Highlights

  • 28 mm bore fits standard metric shafts
  • Carbon steel hub handles 7,000 RPM operation
  • Buna-N spider delivers 0.66 hp at 100 RPM
  • Urethane spider provides 1 hp at 100 RPM
  • Hytrel spider supports 1.8 hp at 100 RPM

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the L100 28 mm jaw coupling hub on a shaft, and what step is often missed?

Slide the hub onto the 28 mm shaft, align the 8 mm keyway with the shaft key, then tighten the set screw over the key — many forget to seat the key fully before locking the screw.

What maintenance or replacement will the L100 hub need later?

The hub itself is carbon steel and requires no routine replacement; only the centre spider element (Buna-N, Urethane or Hytrel) wears and must be swapped when vibration or backlash appears.

At what speed limit does the L100 28 mm hub reach its maximum rated RPM under sustained use?

The hub is rated to 7,000 RPM; exceeding this speed risks imbalance and premature spider failure even if torque is within limits.

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