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Cast iron jaw coupling hub L190 with 1-1/8 inch bore and keyway

Lovejoy

Lovejoy L190 Jaw Coupling Hub Cast Iron 1-1/8 in Bore

SKU CH-8TR0-9DG06

Cast-iron jaw coupling hub with 1-1/8 in bore, set-screw locking and 5,000 RPM rating for L190 elements

  • Cast iron hub handles 5 000 RPM for high-speed drives
  • 1-1/8 in bore with keyway fits standard shafts directly
  • Set-screw locking secures hub without extra hardware
  • Works with Buna-N, urethane or Hytrel spiders for flexible torque
  • 4-1/2 in outside diameter matches L190 coupling size

Application Fit

This cast-iron jaw coupling hub fits 1-1/8 inch shafts with a standard keyway and set-screw locking. It suits maintenance teams and OEM builders replacing worn hubs on existing L190 assemblies or specifying new drives that stay within the 5,000 RPM limit. Buyers needing a different bore size, a clamp-style hub, or a complete coupling kit with spider included should look elsewhere.

Interface Limits

The hub accepts L190H Buna-N, L190N Urethane and L190U Hytrel center elements, which set the torque ceiling at 2.7 hp, 4.1 hp or 7.4 hp respectively when measured at 100 RPM. Straight-jaw geometry and the 4-1/2 inch outside diameter fix the maximum misalignment and radial load capacity inherent to the L190 series. Exceeding 5,000 RPM or using non-listed spiders voids the rated performance.

Installation Checklist

Verify the shaft diameter is exactly 1-1/8 inch and that the keyway measures 1/4 inch wide by 1/8 inch deep before ordering. Confirm the mating hub uses the same L190 jaw profile so the center element seats correctly. Ensure the set-screw location clears adjacent components and that the 4-7/8 inch overall coupling length fits the available shaft spacing.

Highlights

  • Cast iron hub handles 5 000 RPM for high-speed drives
  • 1-1/8 in bore with keyway fits standard shafts directly
  • Set-screw locking secures hub without extra hardware
  • Works with Buna-N, urethane or Hytrel spiders for flexible torque
  • 4-1/2 in outside diameter matches L190 coupling size

Specifications

No published specifications for this item yet.

Questions about this item

Which spider material should I choose for the L190 hub to match my torque requirement?

At 100 RPM the Buna-N spider delivers 2.7 hp, urethane 4.1 hp and Hytrel 7.4 hp; select the spider whose horsepower rating meets or exceeds your load at that speed.

What does the 5,000 RPM maximum speed mean when the hub is mounted on a 1-1/8 in shaft?

The 5,000 RPM limit is the mechanical ceiling for the L190 cast-iron hub; operating above it risks imbalance and premature wear regardless of shaft diameter.

How does the straight-jaw profile and set-screw locking affect alignment and backlash in practice?

The straight jaws and set-screw bore transmit torque with minimal backlash but require accurate shaft alignment; angular or parallel misalignment will increase reaction forces on the spider element.

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