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Black oxide steel rigid coupling two piece construction 1.43 in clearance diameter 940 in lb torque rating

Dayton

Dayton 3ZN67 Rigid Steel Trap 1.43 in 940 in-lb

SKU CH-TDW3-QCH6H MPN 3ZN67

Two-piece carbon-steel rigid coupling rated for 940 in-lb torque at 4,000 RPM with 1.43 in clearance diameter

  • TypeDrain Components
  • Rigid carbon-steel construction withstands 940 in-lb torque
  • 43 in clearance diameter fits tight installations
  • Two-piece design simplifies shaft alignment and maintenance
  • Keyed round bores prevent slippage under 4,000 RPM loads
  • Black oxide finish resists corrosion in harsh environments

Rigid Steel Coupling with Keyed Bores

The Dayton 3ZN67 is a two-piece rigid shaft coupling machined from carbon steel with a black oxide finish. It connects shafts using round keyed bores sized at 1 5/8 in and 5/8 in, each fitted with a 3/16 in keyway. The unit suits mechanical drives where precise alignment and zero backlash are required.

Sustained Torque Capacity at Rated Speed

This coupling transmits a maximum torque of 940 in-lb continuously at speeds up to 4,000 RPM. The rigid two-piece construction eliminates the wind-up found in flexible types, so torque delivery remains constant throughout extended duty cycles. Heat buildup is limited to the connected shafts because the coupling itself has no damping element.

Clearance and Dimensional Constraints

The coupling outside diameter is 1 5/16 in while the clearance diameter measures 1.43 in, defining the minimum space needed for installation and rotation. Overall length is 2 in, fixing the axial gap between shaft ends. The fixed bore sizes and keyway depths of 3/32 in on both sides mean the part cannot adapt to different shaft diameters or key standards.

Highlights

  • Rigid carbon-steel construction withstands 940 in-lb torque
  • 43 in clearance diameter fits tight installations
  • Two-piece design simplifies shaft alignment and maintenance
  • Keyed round bores prevent slippage under 4,000 RPM loads
  • Black oxide finish resists corrosion in harsh environments

Specifications

TypeDrain Components
BrandDayton
Model3ZN67

Questions about this item

Will the 940 in-lb torque rating hold up if the coupling runs at 4,000 RPM all day?

The coupling is rated for 940 in-lb maximum torque at up to 4,000 RPM, so continuous operation at that speed stays within its design limits.

My shafts measure 1 5/8 in and 2 5/8 in round keyed — will they fit without extra machining?

Both bores are round keyed at 1 5/8 in and 2 5/8 in with matching keyways, so the coupling slides on directly.

The two-piece carbon steel body has a 1.43 in clearance diameter — will it clear my existing 1 5/16 in OD flanges?

The 1.43 in clearance diameter is larger than the 1 5/16 in outside diameter, leaving enough radial space for the flanges.

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