Ruland Manufacturing PCR18-8-4-A Coupling 4 Beam Clamp Bore 1/2 x 1/4 In
A 4-beam aluminium clamp coupling joins 1/2 in and 1/4 in shafts with 3° angular misalignment capacity
- Product typeCouplings, Collars & Adapters
- Handles 3° angular misalignment for flexible shaft alignment
- Transmits up to 34 in-lb torque at 6,000 RPM
- Four-beam aluminum design gives 4.55 in-lb/Deg torsional stiffness
- Clamp-on bore fits 1/2 in and 1/4 in shafts without keys
- Allows 0.01 in axial motion and 0.015 in parallel offset
1/2 x 1/4 Inch Bore Coupling
This four-beam clamp coupling connects shafts with different bore diameters in motion-control assemblies. The aluminum body provides a lightweight link while maintaining torsional stiffness for accurate positioning. It suits builders who need a compact, inch-dimensioned coupling for light-duty power transmission.
Thermal and Power Characteristics
The aluminum construction dissipates heat naturally during continuous operation up to the rated speed. No active cooling or lubrication is required, so the unit runs silently and adds negligible parasitic load to the drivetrain. It is not suited for environments where the Prop 65-listed material constituents are prohibited.
Sustained Load Behaviour
At the maximum 6,000 RPM the coupling transmits up to 34 in-lb of torque while accommodating 3 degrees of angular misalignment and 0.015 in of parallel offset. Axial motion of 0.01 in is absorbed without binding, and the 4.55 in-lb/Deg torsional stiffness maintains positional repeatability over long runs. Builders needing higher torque or larger bore combinations must select a different model.
How it compares
Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.
- Price $48.99
- Pricier than about 62% of the 693 comparable items (median $35.99).
Specifications
| Product | |
|---|---|
| Product type | Couplings, Collars & Adapters |
Questions about this item
How do I install the clamp-on coupling on the 1/2 in and 1/4 in shafts, and what step is often missed?
Loosen the clamp screws, slide the coupling onto each shaft to the 0.7 in bore depth, then tighten the screws evenly to the specified torque; the step often missed is verifying the 0.015 in parallel misalignment limit after tightening.
What maintenance or replacement will this aluminum 4-beam coupling need over time?
Periodically check the clamp screws for loosening and inspect the beams for fatigue cracks; replace the coupling if axial play exceeds 0.01 in or if torsional stiffness drops below 4.55 in-lb/Deg.
What is the first limit reached when running this coupling continuously at high speed?
The 6,000 RPM maximum speed limit is reached first; exceeding it risks overheating the aluminum beams and surpassing the 34 in-lb torque rating.
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