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Black oxide steel rigid shaft coupling one piece 1.85 inch clearance diameter

Dayton

Dayton 3ZN61 Rigid Shaft Coupling 1 in Bore 2600 in-lb Torque

SKU CH-RMC7-V3NHR MPN 3ZN61

A rigid one-piece carbon steel shaft coupling with 1-inch round keyed bores rated for 2,600 in-lb torque at up to 4,000 RPM

  • TypeDrain Components
  • Rigid one-piece carbon steel coupling handles 2,600 in-lb torque
  • Keyed round bores at 1.85 in clearance prevent slippage
  • Black oxide steel finish resists corrosion in harsh environments
  • Rated for 4,000 RPM maximum speed ensures reliable power transmission
  • 3 in overall length fits standard shaft alignment requirements

Rigid Shaft Coupling 1 in Bore

The Dayton 3ZN61 is a one-piece rigid shaft coupling machined from carbon steel with a black oxide finish. It joins two shafts that share the same 1 inch round keyed bore size. The coupling transmits torque without flexibility, making it suitable for aligned drive assemblies in industrial machinery.

Check Shaft Dimensions and Speed

Verify that both shafts measure exactly 1 inch in diameter and feature keyways matching the 1/4 inch width and 1/8 inch depth specified for this coupling. Confirm the application speed does not exceed 4,000 RPM and that the torque requirement stays within the 2,600 in-lb rating. Misalignment or overspeed will cause premature failure.

One-Piece Carbon Steel Construction

The single-piece design eliminates moving parts and backlash, so the connection remains fixed once the set screws engage the keyways. An outside diameter of 1.85 inches and an overall length of 3 inches define the space the coupling occupies on the shaft. The black oxide coating provides basic corrosion resistance in dry environments.

Highlights

  • Rigid one-piece carbon steel coupling handles 2,600 in-lb torque
  • Keyed round bores at 1.85 in clearance prevent slippage
  • Black oxide steel finish resists corrosion in harsh environments
  • Rated for 4,000 RPM maximum speed ensures reliable power transmission
  • 3 in overall length fits standard shaft alignment requirements

Specifications

TypeDrain Components
BrandDayton
Model3ZN61

Questions about this item

What comes in the box and is any additional hardware needed for installation?

The box contains the rigid steel coupling only; key stock and set screws must be sourced separately.

The listing shows a single model — how do I know this is the correct bore and torque rating for my application?

This coupling has a 1 in round keyed bore on both ends and a 2,600 in-lb torque rating, so match those figures to your shaft and load requirements.

What does the 4,000 RPM rating mean when the coupling is mounted on a real shaft?

It indicates the maximum safe rotational speed; operating above 4,000 RPM risks imbalance and premature wear.

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