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Aluminium motion-control coupling with four beams and set-screw bores 1/2" and 1/4

Ruland Manufacturing

Ruland Manufacturing PSR18-8-4-A Motion Control Coupling, Set Screw, 1/2" x 1/4

SKU CH-9R1N-YXVHX

A set-screw motion-control coupling joins 1/2" and 1/4" shafts with 3-degree angular and 0.015" parallel misalignment capacity, rated to 34 in-lb torque at 6,000 RPM

  • Accommodates different shaft sizes with 1/2" and 1/4" bores
  • Handles up to 34 in-lb torque for reliable power transfer
  • Operates at speeds up to 6,000 RPM for high-speed applications
  • Compensates for 3-degree angular and 0.015 in parallel misalignment
  • Aluminium construction with four-beam design provides 4.55 in-lb/Deg torsional stiffness

Motion Control Coupling 1/2" x 1/4

This aluminium coupling joins a half-inch shaft to a quarter-inch shaft using set-screw locking on both bores. It is intended for light-duty motion-control applications where precise angular alignment is required. The four-beam design provides measured torsional stiffness while allowing limited misalignment.

Build quality and day-to-day fit

The coupling is machined from aluminium with an outside diameter of 1 1/8 inches and an overall length of 1 1/2 inches. Each bore is round and accepts its shaft through a 0.7-inch engagement length secured by a set screw. This arrangement allows quick installation and removal without specialised tools but does not suit high-vibration environments where screws can loosen.

Specification that decides fit

Rated for a maximum torque of 34 in-lb at up to 6,000 RPM, the coupling tolerates 3 degrees of angular misalignment, 0.015 inches of parallel offset and 0.01 inches of axial motion. Buyers whose application exceeds any of these limits must select a different coupling.

Highlights

  • Accommodates different shaft sizes with 1/2" and 1/4" bores
  • Handles up to 34 in-lb torque for reliable power transfer
  • Operates at speeds up to 6,000 RPM for high-speed applications
  • Compensates for 3-degree angular and 0.015 in parallel misalignment
  • Aluminium construction with four-beam design provides 4.55 in-lb/Deg torsional stiffness

Specifications

No published specifications for this item yet.

Questions about this item

What does the 6,000 RPM limit mean for a 1/2" x 1/4" set-screw coupling?

The 6,000 RPM rating is the maximum rotational speed; exceeding it risks vibration, premature wear, or coupling failure in motion-control applications.

What shaft diameters and keyway clearance does the PSR18-8-4-A require?

It accepts a 1/2 in bore on one side and a 1/4 in bore on the other, both round with no keyway; the 1 1/8 in outside diameter and 1 1/2 in overall length define the mounting envelope.

How do I install the set screws correctly, and what torque should I use?

Align shafts within 3° angular and 0.015 in parallel misalignment, insert to the 0.7 in bore depth, then tighten both set screws evenly to the manufacturer's recommended torque to avoid distortion.

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