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Black oxide carbon steel rigid coupling, one-piece, 1.19 in clearance diameter, 480 in-lb torque rating

Dayton

Dayton 3ZN57 Rigid Steel Coupling 1.19 in 480 in-lb

SKU CH-7Q54-7TJJZ MPN 3ZN57

One-piece carbon-steel rigid coupling with 1.19 in clearance bore rated for 480 in-lb torque at 4,000 RPM

  • TypeDrain Components
  • Rigid carbon-steel construction delivers 480 in-lb torque capacity
  • One-piece design eliminates backlash at up to 4,000 RPM
  • Keyed round bores with 1/8 in keyways ensure positive drive
  • Black-oxide finish resists corrosion in harsh environments
  • 19 in clearance diameter fits compact shaft assemblies

Rigid Steel Coupling for Power Transmission

The Dayton 3ZN57 is a one-piece carbon-steel coupling with a black-oxide finish designed to connect two round-keyed shafts. It suits maintenance technicians and machinery builders who need a rigid, zero-backlash link in light-duty drive lines.

Handles 480 in-lb Torque at 4000 RPM

The coupling transmits up to 480 in-lb of torque and is rated for speeds up to 4,000 RPM, giving headroom for small pumps, conveyors and gearboxes. It runs out when an application exceeds either the torque limit or the speed rating, or when shaft misalignment requires a flexible element.

1.19 in Clearance Diameter Decides Fit

The 1.19 in clearance diameter is the critical dimension that determines whether the coupling clears adjacent components on the shaft. Verify this clearance against your assembly before ordering, as no other size variants are offered for this model.

Highlights

  • Rigid carbon-steel construction delivers 480 in-lb torque capacity
  • One-piece design eliminates backlash at up to 4,000 RPM
  • Keyed round bores with 1/8 in keyways ensure positive drive
  • Black-oxide finish resists corrosion in harsh environments
  • 19 in clearance diameter fits compact shaft assemblies

Specifications

TypeDrain Components
BrandDayton
Model3ZN57

Questions about this item

Will the 1.19 in clearance diameter fit my existing 1 1/2 in and 2 1/2 in keyed shafts?

The coupling has two round keyed bores sized at 1 1/2 in and 2 1/2 in with a 1.19 in clearance diameter, so it matches those shaft sizes directly.

How can I confirm the 480 in-lb torque rating is holding after installation?

Run the assembly up to 4,000 RPM and verify there is no slip, vibration or temperature rise at the joint; smooth operation at rated speed confirms the 480 in-lb capacity.

Does the box include keys or set screws for the 1 1/8 in keyways?

The one-piece carbon steel coupling with black oxide finish is supplied alone; keys and set screws for the 1 1/8 in keyways must be purchased separately.

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