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Black oxide steel rigid coupling with two-piece construction

Dayton

Dayton 3ZN66 Rigid Steel Coupling 1.22 in 480 in-lb

SKU CH-ZJ9J-9YQ55 MPN 3ZN66

Rigid steel coupling transmits up to 480 in-lb of torque with a 1.22 in clearance diameter

  • TypeDrain Components
  • Rigid two-piece carbon steel construction ensures precise shaft alignment
  • 480 in-lb torque rating handles demanding power transmission tasks
  • 4,000 RPM maximum speed supports high-speed rotating applications
  • 22 in clearance diameter fits standard shaft dimensions
  • Black oxide finish protects against corrosion in harsh environments

Rigid Steel Coupling 1.22 in

The Dayton 3ZN66 is a two-piece rigid shaft coupling made from carbon steel with a black oxide finish. It connects round keyed shafts using a 1.22 in clearance diameter and an overall length of 1 3/4 in. The coupling suits maintenance and repair tasks where a solid, non-flexible connection is required between matched bore sizes.

Sustained torque limit 480 in-lb

Rated for a maximum torque of 480 in-lb and a top speed of 4,000 RPM, the coupling transmits power without slip when operated within these limits. Exceeding either value risks permanent deformation of the keyway or bore surfaces. The carbon steel construction resists wear during continuous operation at rated load.

Keyway dimensions fix shaft fit

Each bore uses a 1 1/8 in keyway width with depths of 1 1/16 in and 2 1/16 in respectively, so only shafts machined to those exact keyway specifications will engage correctly. The coupling does not accommodate different bore sizes or alternative key profiles. Builders needing flexible misalignment tolerance or larger bore combinations must select a different coupling style.

Highlights

  • Rigid two-piece carbon steel construction ensures precise shaft alignment
  • 480 in-lb torque rating handles demanding power transmission tasks
  • 4,000 RPM maximum speed supports high-speed rotating applications
  • 22 in clearance diameter fits standard shaft dimensions
  • Black oxide finish protects against corrosion in harsh environments

Specifications

TypeDrain Components
BrandDayton
Model3ZN66

Questions about this item

How much heat or noise does the 480 in-lb steel coupling generate when running continuously at 4,000 RPM?

The coupling itself has no motor or bearings, so it produces no heat or noise; any sound or temperature rise comes from the connected shafts and driven equipment.

What shaft sizes and keyways must already be on the machine for the 1.22 in clearance coupling to fit?

Both shafts need a 1 1/2 in round bore with a 1 1/8 in wide by 1 1/16 in deep keyway, and a 2 1/2 in round bore with a 2 1/8 in wide by 2 1/16 in deep keyway.

Will the two-piece carbon-steel coupling align with the older flanged hubs already on my 1 1/8 in OD drive line?

Yes, the coupling’s 1 1/8 in outside diameter matches that hub size, and the two-piece clamp design bolts around existing shafts without removing the old hubs.

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