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Aluminium beam coupling, bright finish, 0.75 in diameter, 22.9 mm long

Ruland Manufacturing

Ruland Manufacturing PCR12-4-2-A Conduit 1/4 x 1/8 in Bore 14 in-lb

SKU CH-ZKG3-X00G7

Aluminium motion-control coupling with ¼ in × ⅛ in bores, 14 in-lb torque and 6,000 rpm limit

  • Aluminium construction resists corrosion
  • 14 in-lb rated torque handles light loads
  • 6,000 RPM maximum speed suits high-speed shafts
  • 225 °F temperature rating withstands heat
  • 75 in outside diameter fits compact spaces

Precision Motion Coupling

The Ruland Manufacturing PCR12-4-2-A is an aluminum beam coupling designed for motion control applications. It connects shafts with 1/4 in and 1/8 in bores while transmitting up to 14 in-lb of torque. The single-piece clamp design uses an M 2.5 cap screw for secure shaft locking. Rated for 6,000 RPM maximum speed, it suits precision automation equipment.

Suited For Direct Drive Alignment

This coupling fits servo and stepper motor shafts where low inertia and zero backlash are required. The 0.75 in outside diameter and 22.9 mm overall length allow integration into compact assemblies. Builders needing higher torque capacity or larger bore combinations should evaluate alternative coupling styles. The aluminum construction limits use in highly corrosive environments.

Build Integration Requirements

The coupling requires matched shaft diameters of 1/4 in and 1/8 in with 0.45 in length through bore engagement. Operating temperatures up to 225 Degrees F are supported by the material. The bright finish provides standard surface protection. Ensure shaft alignment stays within the beam coupling's angular and parallel misalignment limits for rated performance.

How it compares

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Price $33.99
Typical for this category: the median of 1,290 items is $28.99.

Specifications

Product
Brand nameRULAND MANUFACTURING

Questions about this item

Which shaft sizes match the 1/4 in and 1/8 in bores on this coupling?

The coupling accepts a 1/4 in shaft on one side and a 1/8 in shaft on the other; both must be present and correctly sized for the clamp to engage.

Will the 0.75 in outside diameter and 22.9 mm overall length fit inside the space left by my existing motor mount?

Measure the clearance in your current mount; the coupling needs at least 0.75 in radial space and 22.9 mm axial room to sit without interference.

How can I confirm the joint is transmitting torque correctly after installation?

Tighten the M2.5 cap screw to the recommended preload, run the system up to 6,000 RPM, and verify smooth rotation with no slip or temperature rise above 225 °F.

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