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Aluminium jaw coupling hub, 12 mm bore, clamp-on, curved jaws

Ruland Manufacturing

Ruland Manufacturing MJC25-12-A Jaw Coupling Hub 12 mm

SKU CH-8C1N-NDTRW

A 12 mm bore aluminum jaw coupling hub rated to 8 000 RPM with clamp-on locking and fail-safe design

  • Precision fit for 12 mm shafts with +0.05/-0.00 mm bore tolerance
  • Clamp-on locking secures hub without keyway machining
  • Curved jaw profile enables fail-safe operation up to 8,000 RPM
  • Aluminium construction keeps rotating mass low at 25.4 mm diameter
  • Compact 35.3 mm overall length fits tight machine envelopes

Jaw Coupling Hub for 12 mm Shafts

This metric jaw coupling hub fits a 12 mm round bore with a clamp-on locking screw. It is built for power-transmission assemblies that use MJC25-size components and require a fail-safe aluminium hub rated to 8 000 RPM.

Check Shaft Tolerance and Bearing Support

Verify that your shaft diameter falls within the +0.000/-0.013 mm tolerance and that the application provides full bearing support. The hub has no keyway, so torque is transmitted solely through the clamp screw and jaw engagement.

Aluminium Hub with Curved Jaw Profile

The 25.4 mm diameter aluminium hub uses a curved jaw profile and an M3 clamp screw for secure mounting. Its 35.3 mm overall length keeps the assembly compact while the fail-safe design maintains connection if the elastomer element fails.

Highlights

  • Precision fit for 12 mm shafts with +0.05/-0.00 mm bore tolerance
  • Clamp-on locking secures hub without keyway machining
  • Curved jaw profile enables fail-safe operation up to 8,000 RPM
  • Aluminium construction keeps rotating mass low at 25.4 mm diameter
  • Compact 35.3 mm overall length fits tight machine envelopes

Specifications

No published specifications for this item yet.

Questions about this item

Does the MJC25-12-A jaw coupling hub come with the elastomer spider or must it be ordered separately?

The listing describes only the aluminum hub with a 12 mm clamp-on bore; the curved-jaw spider is not included and must be purchased separately to complete the coupling.

How do I confirm that the MJC25 size matches my application when the bore is 12 mm?

The hub is built to the MJC25 standard with a 25.4 mm outside diameter, 35.3 mm overall length and a +0.05/-0.00 mm bore tolerance, so match those dimensions to your shaft and spider specifications.

What does the 8,000 RPM maximum speed mean for continuous operation on a metric shaft?

The hub is rated for 8,000 RPM with a shaft tolerance of +0.000/-0.013 mm and requires full bearing support; ensure your shaft and alignment meet those limits for safe continuous running.

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