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Aluminium jaw coupling hub, 6 mm bore, clamp-on, 25.4 mm diameter, 35.3 mm long

Ruland Manufacturing

Ruland Manufacturing MJC25-6-A Jaw Coupling Hub 6 mm Bore

SKU CH-HJ93-MCH1D

Aluminium jaw coupling hub with 6 mm clamp bore, 25.4 mm diameter and 8 000 RPM rating

  • Clamp-on locking secures shafts without keyways
  • 8,000 RPM rating supports high-speed power transmission
  • Curved jaw profile dampens vibration and shock
  • Aluminium hub reduces rotating mass
  • 6 mm bore fits metric shafts directly

Precision Jaw Coupling Hub

The Ruland Manufacturing MJC25-6-A is a metric jaw coupling hub designed for power transmission applications. It features a 6 mm round bore with a clamp-on locking mechanism for secure shaft attachment. The hub is constructed from aluminum and has an outside diameter of 25.4 mm with an overall length of 35.3 mm.

Operational Speed and Fit Constraints

This hub is rated for a maximum speed of 8,000 RPM and requires full bearing support during installation. The bore tolerance is +0.05/-0.00 mm while the shaft tolerance is +0.000/-0.013 mm, demanding precise shaft dimensions for proper clamp engagement. A curved jaw profile accommodates the corresponding spider element.

Replaces Worn Hubs in MJC25 Assemblies

This component serves as a direct replacement for damaged or worn hubs within existing MJC25 coupling systems. The upgrade is justified when the original hub bore is damaged, when a different bore diameter is required, or when the clamp screw threads are stripped. It is not suited for applications exceeding the rated speed or where full bearing support cannot be provided.

Highlights

  • Clamp-on locking secures shafts without keyways
  • 8,000 RPM rating supports high-speed power transmission
  • Curved jaw profile dampens vibration and shock
  • Aluminium hub reduces rotating mass
  • 6 mm bore fits metric shafts directly

Specifications

No published specifications for this item yet.

Questions about this item

Which bore diameter should I select for a 6 mm shaft?

The MJC25-6-A hub is machined with a 6 mm round bore and a clamp-on locking screw, so it matches a 6 mm shaft directly.

What does the 8,000 RPM rating mean when the hub is installed?

It indicates the maximum rotational speed the aluminum hub can sustain without exceeding its design limits, provided the shaft tolerance of +0.000/-0.013 mm is met.

How does the M3 clamp screw affect the torque the coupling can transmit?

The M3 screw clamps the hub onto the shaft, creating a friction fit that transmits torque up to the coupling's rated capacity without a keyway.

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