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Aluminium jaw coupling hub, 25 mm bore, 57.2 mm diameter, clamp-on design

Ruland Manufacturing

Ruland Manufacturing MJC57-25-A Jaw Coupling Hub 25 mm bore

SKU CH-GT05-K93P7

A 25 mm clamp-on jaw coupling hub rated to 8,000 RPM with a 57.2 mm aluminium body

  • 25 mm bore fits metric shafts directly
  • Clamp-on locking secures hub without keyway
  • Curved jaw profile enables fail-safe operation
  • Aluminium construction rated to 8,000 RPM
  • 2 mm diameter suits MJC57 coupling size

Jaw Coupling Hub 25 mm Bore

The Ruland MJC57-25-A is a metric jaw coupling hub designed to connect two shafts in power transmission systems. It fits a 25 mm round bore with a clamp-on locking method and suits machinery builders who need a precise, metric-dimensioned hub for general-purpose drives.

Capacity and Speed Limit

The hub handles speeds up to 8, 000 RPM and carries a bore tolerance of +0.05/-0.00 mm against a shaft tolerance of +0.000/-0.013 mm. It requires full bearing support on the driven equipment and will not compensate for misalignment beyond the curved jaw profile's inherent capability.

Upgrade Context and Limits

This clamp-on hub replaces set-screw or keyed hubs where a keyless, concentric grip on a 25 mm shaft is preferred. The jump is worth it when the application demands zero backlash at the hub-shaft interface and the drivetrain already provides the required external bearing support.

Highlights

  • 25 mm bore fits metric shafts directly
  • Clamp-on locking secures hub without keyway
  • Curved jaw profile enables fail-safe operation
  • Aluminium construction rated to 8,000 RPM
  • 2 mm diameter suits MJC57 coupling size

Specifications

No published specifications for this item yet.

Questions about this item

Will the 25 mm bore hub fit onto the 25 mm shaft I already use with a +0.000/-0.013 mm tolerance?

Yes, the hub bore tolerance of +0.05/-0.00 mm and shaft tolerance of +0.000/-0.013 mm are compatible for a clamp-on connection.

How can I confirm the aluminium hub runs true at up to 8,000 RPM after installation?

Check for smooth rotation without vibration, verify the M6 clamp screw is torqued correctly, and ensure full bearing support is in place as required.

Does the box include the curved-jaw spider or must I order the MJC57 spider separately?

The hub is sold alone; the matching curved-jaw spider for size MJC57 must be purchased separately to complete the coupling.

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