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Two-piece carbon steel coupling clamp 2-1/4 inch length

Dayton

Dayton 3ZN68 Rigid Shaft Coupling Trap 2-1/4" L

SKU CH-ZP7V-G982G MPN 3ZN68

Connects two shafts with a two-piece carbon-steel clamp rated for 1,950 in-lb torque at 4,000 RPM

  • Product typeDrain Components
  • Two-piece carbon steel construction simplifies installation and maintenance
  • 4,000 RPM maximum speed supports high-speed shaft applications
  • 1,950 in-lb torque capacity handles demanding power transmission
  • 63 in clearance diameter fits standard shaft dimensions
  • Round keyed bore design ensures secure, slip-free connection

Rigid Shaft Coupling for Power Transmission

The Dayton 3ZN68 is a two-piece carbon-steel coupling designed to connect round keyed shafts in industrial machinery. It suits maintenance engineers and plant mechanics who need a compact, high-torque link between matched 1 3/4 in and 1 1/2 in bores. The clamp-style construction allows straightforward installation without specialised tooling.

Matched Bore Diameters 1 3/4 in and 1 1/2 in

This coupling only fits applications where the first shaft measures exactly 1 3/4 in and the second shaft measures exactly 1 1/2 in, both with round keyed profiles. The keyway dimensions are 1 3/16 in width by 1 3/32 in depth on the larger bore and 3/16 in width by 3/32 in depth on the smaller bore. Different bore sizes are not supported by this model.

Rated to 4 000 RPM with 1 950 in-lb Torque Capacity

In normal operation the coupling transmits up to 1 950 in-lb at speeds up to 4 000 RPM. The carbon-steel body and two-piece clamp design maintain alignment while keeping vibration and noise low. A clearance diameter of 1.63 in provides space for adjacent components without adding bulk.

How it compares

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

Price $43.99
Pricier than about 59% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name3ZN68
Product typeDrain Components

Questions about this item

What does the 1,950 in-lb torque rating mean when this coupling is installed?

It indicates the maximum twisting force the carbon-steel coupling can transmit between shafts without slipping or damage.

How does the 4,000 RPM limit affect the keyed bore connection?

The two-piece clamp design keeps the keyways aligned up to that speed; beyond it vibration can loosen the joint.

What shaft diameters and keyway sizes are needed to mount this 2-1/4" long coupling?

It fits one 1-3/4" shaft with a 3/16" keyway and one 2-3/4" shaft with a 3/16" keyway, both round and keyed.

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