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Cylindrical zinc-plated steel coupling with keyed bores

Dayton

Dayton 3ZN53 Rigid Steel Coupling 1-1/8 in Bore 1200 in-lb 1800 RPM

SKU CH-7R3Y-4RFQ1 MPN 3ZN53

Connects two 1-1/8 in shafts at up to 1200 in-lb and 1800 RPM with a one-piece zinc-plated carbon steel body

  • TypeDrain Components
  • Zinc-plated carbon steel resists corrosion in demanding environments
  • One-piece rigid construction ensures precise shaft alignment under load
  • 1-1/8 inch keyed bores on both ends provide secure torque transmission
  • Rated for 1,200 in-lb maximum torque at 1,800 RPM
  • 13 inch clearance diameter fits standard installations

Rigid Steel Coupling 1-1/8 in Bore

The Dayton 3ZN53 is a one-piece rigid shaft coupling machined from carbon steel with a zinc-plated finish. It connects two shafts that share an identical 1 1/8 inch round keyed bore. The unit suits maintenance crews and OEM assemblers who need a permanent, backlash-free connection in light-duty power transmission.

Speed and Torque Limits

The coupling is rated for a maximum rotational speed of 1,800 RPM and a peak torque capacity of 1,200 in-lb. Exceeding either value risks mechanical failure or accelerated wear. The keyway dimensions of 1/4 inch width and 1/8 inch depth on each bore set the practical shear limit for the key stock used.

Capacity and Headroom

The 1,200 in-lb torque rating provides adequate headroom for fractional-horsepower motors and gear reducers in conveyor, pump or fan drives. Applications that demand misalignment compensation, vibration damping or frequent disassembly will require a flexible or jaw-type coupling instead. The 3-inch overall length and 2.13 inch clearance diameter define the minimal envelope needed for installation.

Highlights

  • Zinc-plated carbon steel resists corrosion in demanding environments
  • One-piece rigid construction ensures precise shaft alignment under load
  • 1-1/8 inch keyed bores on both ends provide secure torque transmission
  • Rated for 1,200 in-lb maximum torque at 1,800 RPM
  • 13 inch clearance diameter fits standard installations

Specifications

TypeDrain Components
BrandDayton
Model3ZN53

Questions about this item

Should I pick the 1-1/8 in bore or a different size for my shaft?

This coupling has identical 1-1/8 in round keyed bores on both ends, so it only fits shafts of that exact diameter and keyway.

What does the 1200 in-lb torque rating mean when the coupling is installed?

It is the maximum torque the carbon-steel body can transmit continuously at up to 1800 RPM without exceeding its design limits.

How does the keyway interface affect alignment and speed capability?

The 1/4 in wide keyways on both bores lock the coupling to the shafts, preventing slip and allowing the full 1800 RPM rating when properly fitted.

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