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Small aluminum jaw coupling hub, 19.1 mm diameter, clamp-on bore 8 mm

Ruland Manufacturing

Ruland Manufacturing MJC19-8-A Jaw Coupling Hub 8 mm Bore

SKU CH-Y54P-F52TX

An 8 mm bore aluminium jaw coupling hub for MJC19 series, clamp-on shaft locking rated to 8,000 RPM

  • Clamp-on locking secures shafts without keyways
  • Aluminium hub reduces rotating mass for faster response
  • 8 000 RPM rating supports high-speed drives
  • 8 mm bore fits metric shafts directly
  • Curved jaw profile absorbs shock and misalignment

Jaw Coupling Hub with 8 mm Bore

This jaw coupling hub is built for metric power-transmission systems that require a precise 8 mm round bore. The clamp-on locking method secures the hub to the shaft without a keyway, simplifying installation and removal on light-duty machinery.

Sustained Operation up to 8 000 RPM

Aluminium construction and a curved jaw profile keep the hub balanced at the rated 8 000 RPM maximum speed. The fail-safe design maintains drive continuity if the elastomer spider wears, while full bearing support on the connected shafts is required to handle radial loads during continuous running.

Verify Shaft Tolerance and Spider Compatibility

Ensure the mating shaft falls within the +0.000 / -0.013 mm tolerance so the clamp achieves full grip without damaging the aluminium hub. Confirm you have an MJC19 series spider with a 19.1 mm outside diameter, as the hub will not accept other sizes or profiles.

Highlights

  • Clamp-on locking secures shafts without keyways
  • Aluminium hub reduces rotating mass for faster response
  • 8 000 RPM rating supports high-speed drives
  • 8 mm bore fits metric shafts directly
  • Curved jaw profile absorbs shock and misalignment

Specifications

No published specifications for this item yet.

Questions about this item

How much heat or vibration will the MJC19 hub add when running continuously at 8,000 RPM?

The aluminum hub itself generates no heat; any temperature rise comes from the driven load. At 8,000 RPM the curved jaw profile and fail-safe spider keep vibration low, provided the spider is in good condition and the shafts are aligned.

What shaft and spider must I already have to install this 8 mm clamp-on hub?

You need a round shaft of 8 mm diameter held within a tolerance of +0.000/-0.013 mm and a compatible MJC19 curved-jaw spider; the hub clamps on with an M2.5 screw and requires full bearing support on the shaft.

Will this MJC19 hub fit the 19.1 mm spider and shafts from my older MJC19 coupling?

Yes. The hub shares the 19.1 mm outside diameter and standard MJC19 curved jaw profile, so it mates with existing MJC19 spiders and hubs of the same size.

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