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Stainless steel rigid shaft coupling with set screw

Ruland Manufacturing

Ruland Manufacturing SCX-8-8-SS Rigid Shaft Coupling

SKU CH-GDDX-17MRZ

A rigid shaft coupling in 303 stainless steel connects 1/2 inch bores with a set-screw design rated to 4,000 RPM

  • 303 stainless steel resists corrosion in demanding environments
  • Set-screw design secures shafts without a keyway
  • Bright finish adds surface protection and clean appearance
  • Rated to 4,000 RPM for high-speed power transmission
  • California Proposition 65 warning included for regulatory compliance

Rigid Shaft Coupling for 1/2 in Bore

The Ruland Manufacturing SCX-8-8-SS rigid shaft coupling connects two shafts of identical diameter without allowing relative motion. Machined from 303 stainless steel with a bright finish, it suits new builds or replacements where precise alignment can be maintained.

Replaces flexible couplings when alignment is

Switching to this rigid design removes wind-up and backlash, which benefits positioning accuracy in low-speed drives. The change is worthwhile only when both shafts stay centred under load, because the coupling cannot absorb misalignment.

Limited to 4,000 RPM and set-screw holding

The set-screw fastening relies on friction against the shaft, so torque capacity drops if the fit loosens over time. Operation above the rated speed risks vibration and screw failure, making the part unsuitable for high-speed spindles.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $40.99
Pricier than about 57% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameRULAND MANUFACTURING

Questions about this item

What shaft diameter does the 1/2 in bore of this SCX-8-8-SS coupling fit?

The bore diameter is 1/2 in, so it fits a 1/2 in shaft. The outside diameter is 1 1/8 in and overall length is 1 3/4 in.

How do I install the set screw on this rigid coupling without damaging the 303 stainless steel shaft?

Align the coupling on the shaft, then tighten the 1/4 in.-20 set screw to the manufacturer's torque spec. Over-torquing can mar the shaft or strip the threads.

When should I replace the set screw on this 4,000 RPM coupling?

Inspect the 1/4 in.-20 set screw at each scheduled maintenance. Replace it if the threads are worn, the hex is rounded, or the screw no longer holds the shaft securely.

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