We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Aluminium six-beam clamp coupling, 1/2 inch bores, silver finish

Ruland Manufacturing

Ruland Manufacturing FCR20-8-8-A 6-Beam Coupling 1/2 x 1/2 in

SKU CH-K861-RRQ8X

Six-beam aluminium coupling clamps two 1/2-inch shafts, handles 50 in-lb torque at 6,000 RPM and compensates 3° angular misalignment

  • Accommodates angular misalignment up to 3 degrees
  • Handles parallel offset of 0.015 in for flexible shaft alignment
  • Clamp-on locking secures 1/2 in round bores without set screws
  • Six-beam aluminum design delivers 13.89 in-lb/Deg torsional stiffness
  • Rated for 6,000 RPM and 50 in-lb maximum torque

6-Beam Aluminium Coupling

The Ruland FCR20-8-8-A is a 6-beam aluminium motion-control coupling with a 1/2 x 1/2 in clamp-on bore. It transmits torque between two shafts while compensating for misalignment. The coupling suits precision machinery where low inertia and zero backlash are required. Rated for 6,000 RPM and 50 in-lb maximum torque.

Suited for matched 1/2 in shafts.

This coupling only fits identical 1/2 in round shafts because Different Bore Sizes is No. It handles angular misalignment up to 3 degrees and parallel offset of 0.015 in. Builders needing different bore diameters or larger shaft sizes must select another model. Axial motion capacity is 0.01 in.

Steady torque delivery at rated speed

Torsional stiffness of 13.89 in-lb/Deg keeps deflection predictable during continuous operation at 6,000 RPM. The 6-beam design distributes stress evenly across the aluminium body, limiting heat build-up under sustained load. Overall length is 1 3/4 in with 0.8 in length through bore. California Proposition 65 warnings apply.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $73.99
Pricier than about 73% of the 693 comparable items (median $35.99).

Specifications

No published specifications for this item yet.

Questions about this item

What shaft diameter must each shaft have for the 1/2 in bore to clamp correctly?

Each shaft must measure 1/2 in diameter so the clamp bore can grip it securely.

Will the coupling tolerate the 3° angular misalignment if the connected motor and leadscrew are slightly out of line?

Yes, the design allows up to 3° of angular offset between shafts.

How can I confirm the coupling is transmitting torque without binding after installation?

Rotate the assembly by hand at low speed; smooth rotation up to 6,000 RPM with no binding shows it is working.

More in Bearings, Belts & Drive Components

Similar items