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Carbon steel jaw coupling hub, 20 mm bore, 54 mm diameter

Lovejoy

Lovejoy L090 20mm Jaw Coupling Hub Carbon Steel

SKU CH-33WM-HFWGJ

Metric jaw coupling hub with 20 mm keyed bore, 54 mm OD and 9 000 RPM rating for power transmission

  • 20 mm bore with keyway fits standard metric shafts
  • Carbon steel hub rated to 9,000 RPM for high-speed drives
  • Buna-N spider delivers 0.23 hp at 100 RPM
  • Urethane spider provides 0.35 hp at 100 RPM
  • Hytrel spider supports 0.64 hp at 100 RPM

L090 Jaw Coupling Hub – 20 mm Bore

This carbon-steel hub fits L090 jaw couplings and accepts a 20 mm round shaft with a 6 mm keyway. It is designed for metric power-transmission systems that use a straight-jaw profile and set-screw locking. The hub suits general industrial machinery where a compact, high-speed coupling is required.

Check shaft size and spider choice

Verify that the driven and driving shafts are 20 mm diameter with a matching 6 mm keyway and 2.8 mm keyway depth. Confirm the centre element part number — L090H, L090N or L090U — to select the correct Buna-N, urethane or Hytrel spider for the torque and misalignment demands of your application.

Mounts between shafts with a centre spider

The hub installs on each shaft end and joins to a compatible L090 centre element, creating a complete coupling rated to 9,000 rpm. At 100 rpm it transmits 0.23 hp with a Buna-N spider, 0.35 hp with urethane or 0.64 hp with Hytrel. Its 54 mm outside diameter and overall length keep the assembly short, leaving more space for adjacent components.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 93% of the 693 comparable items (median $35.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does the L090 hub come with the spider element or do I need to order it separately?

Only the carbon-steel hub is supplied; the Buna-N, urethane or Hytrel spider must be purchased separately.

Which spider material should I choose for the 0.64 hp at 100 RPM rating?

Select the Hytrel spider (part L090H) to reach the 0.64 hp rating; Buna-N gives 0.23 hp and urethane gives 0.35 hp at the same speed.

Will the 20 mm bore with 6 mm keyway fit my motor shaft and handle the 9,000 RPM limit?

Yes — the hub is machined for a 20 mm round shaft with a 6 mm keyway and is rated to 9,000 RPM when properly aligned and secured with the set screw.

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