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Cylindrical black oxide steel coupling with two-piece construction

Dayton

Dayton 3ZN70 Rigid Steel Coupling Trap 1.87 in OD

SKU CH-JN77-1GNGJ MPN 3ZN70

Connects two 1-inch keyed shafts with a two-piece carbon steel coupling rated for 2,600 in-lb torque at 4,000 RPM

  • TypeDrain Components
  • Rigid two-piece design ensures precise shaft alignment
  • Carbon steel construction with black oxide finish resists wear
  • Keyed bores on both ends transmit high torque reliably
  • Rated for 4,000 RPM and 2,600 in-lb maximum torque
  • 87 in clearance diameter fits standard shaft sizes

Rigid Steel Coupling for 1 in Shafts

The Dayton 3ZN70 is a two-piece rigid coupling machined from carbon steel with a black oxide finish. It joins two 1 in round keyed shafts in power-transmission assemblies where angular alignment is already controlled. The coupling transmits torque without accommodating misalignment.

Installation Checks Before Ordering

Verify that both shafts measure 1 in diameter and carry a 1/4 in keyway 1/8 in deep. Confirm the 1.87 in clearance diameter fits inside your housing and that the 3 in overall length clears adjacent components. Ensure the driveline can be aligned within the rigid coupling's near-zero angular tolerance.

Behaviour Under Sustained Load

Rated for 4,000 RPM and 2,600 in-lb maximum torque, the coupling maintains a fixed mechanical connection during continuous operation. Carbon steel construction resists wear at the keyway interface when lubricated. Because the design is rigid, sustained vibration or thermal growth in the shafts transfers directly to bearings and mounts.

Highlights

  • Rigid two-piece design ensures precise shaft alignment
  • Carbon steel construction with black oxide finish resists wear
  • Keyed bores on both ends transmit high torque reliably
  • Rated for 4,000 RPM and 2,600 in-lb maximum torque
  • 87 in clearance diameter fits standard shaft sizes

Specifications

TypeDrain Components
BrandDayton
Model3ZN70

Questions about this item

What components come in the box and what must I supply separately?

The package includes the two-piece carbon steel coupling with 1.87 in outside diameter and 1 in round keyed bores. You must supply the shaft keys and any set screws or locking hardware required for installation.

How do I decide which bore size or keyway version matches my shafts?

This coupling is a single specification: both bores are 1 in diameter with 1/4 in wide by 1/8 in deep keyways. If your shafts differ from those dimensions you will need a different coupling.

What does the 2 600 in-lb torque rating mean when the coupling is running on equipment?

The coupling can transmit up to 2 600 in-lb continuously at speeds up to 4 000 RPM without exceeding its design limits, provided the shafts and keys are correctly fitted and aligned.

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