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Cylindrical zinc-plated steel coupling with keyed bores

Dayton

Dayton 3ZN50 Rigid Steel Coupling 1 1/4 in Bore 2.25 in OD 4 in Length 1800 RPM 1300 in-lb

SKU CH-VZK9-7BV94 MPN 3ZN50

Rigid carbon-steel coupling joins two 1 1/4 in shafts at up to 1800 RPM and 1300 in-lb torque

  • Product typeDrain Components
  • Zinc-plated steel resists corrosion in damp environments
  • One-piece carbon steel construction handles 1,300 in-lb torque
  • 1 1/4 in keyed bore fits standard shafts securely
  • 1,800 RPM rating suits high-speed drive systems
  • 25 in clearance diameter allows compact installation

Rigid Steel Coupling for 1 1/4 in Shafts

This Dayton 3ZN50 coupling connects two shafts that share the same 1 1/4 inch bore diameter. The one-piece carbon steel body is zinc plated for corrosion resistance in industrial power-transmission setups. It suits maintenance crews and OEM builders who need a fixed, zero-backlash joint between matched shafts.

1800 RPM and 1300 in-lb torque rating

The coupling is rated for a maximum speed of 1800 RPM and a maximum torque of 1300 in-lb. These two figures decide whether the part can handle the load and speed of your drivetrain without slipping or fatiguing. Verify both limits against your motor and driven equipment before specifying this coupling.

Keyed bores simplify alignment

Each bore is round with a 1/4 inch keyway machined to a depth of 1/8 inch, so standard keystock locks the hubs to the shafts and prevents rotational slip. The one-piece design means no bolts or clamps to tighten, but the shafts must be accurately aligned during installation because the rigid body cannot absorb angular or parallel misalignment.

How it compares

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

Price $36.99
Typical for this category: the median of 4,240 items is $31.99.

Specifications

Product
Brand nameDayton
Model name3ZN50
Product typeDrain Components

Questions about this item

How does the 1,800 RPM rating affect the coupling when it is installed in a machine?

The 1,800 RPM limit is the maximum safe rotational speed for the carbon steel body; exceeding it risks vibration or fatigue failure in service.

What does the 1,300 in-lb torque rating cap in practice?

The 1,300 in-lb rating is the peak torque the keyed bores and zinc-plated steel can transmit without slipping or shearing the keyway.

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