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Black oxide steel rigid coupling, one-piece carbon steel construction

Dayton

Dayton 3ZN33 Rigid Steel Coupling 1 5/8 in 1.43 in 940 in-lb

SKU CH-YTRK-XMW57 MPN 3ZN33

Connects two 1 5/8 in shafts with a one-piece carbon steel body rated for 940 in-lb at 4,000 RPM

  • TypeDrain Components
  • Rigid one-piece carbon steel construction ensures reliable shaft alignment
  • Black oxide finish provides corrosion resistance for long service life
  • 940 in-lb torque capacity handles demanding power transmission tasks
  • 4,000 RPM maximum speed supports high-speed applications
  • 43 in clearance diameter fits compact installation spaces

Rigid Steel Coupling 940 in-lb

The Dayton 3ZN33 is a one-piece rigid shaft coupling machined from carbon steel with a black oxide finish. It connects two shafts of identical 1 5/8 in round bore diameter. The coupling suits power-transmission applications that require zero backlash and a compact 1.43 in clearance diameter.

Upgrade from flexible or two-piece couplings

This rigid design replaces flexible couplings when angular misalignment is absent and torsional stiffness is critical. The jump is worth it when the drivetrain can be aligned precisely and the 940 in-lb torque rating covers peak loads without the wind-up inherent in elastomeric or jaw-type alternatives.

Sustained load behaviour at 4000 RPM

Under continuous operation up to 4 000 RPM the carbon steel body transmits torque without the heat buildup or wear seen in flexible elements. The one-piece construction eliminates fastener loosening, so the coupling maintains rated torque capacity for the life of the connected equipment.

Highlights

  • Rigid one-piece carbon steel construction ensures reliable shaft alignment
  • Black oxide finish provides corrosion resistance for long service life
  • 940 in-lb torque capacity handles demanding power transmission tasks
  • 4,000 RPM maximum speed supports high-speed applications
  • 43 in clearance diameter fits compact installation spaces

Specifications

TypeDrain Components
BrandDayton
Model3ZN33

Questions about this item

What shaft sizes does the 1 5/8 in and 2 5/8 in bore accept?

The coupling has two round bores — one 1 5/8 in and one 2 5/8 in — with a 1.43 in clearance diameter and no keyways.

How do I install this one-piece carbon-steel coupling without damaging the 940 in-lb torque rating?

Slide each shaft fully into its bore, align the set screws over the flat or keyway on each shaft, then torque the screws to the manufacturer’s spec so the coupling runs true at up to 4,000 RPM.

When should I replace the black-oxide steel coupling?

Inspect regularly for wear, corrosion, or loosening set screws; replace if backlash appears, the bore walls show scoring, or the coupling can no longer transmit 940 in-lb cleanly.

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