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Two-piece carbon steel coupling, 1 1/8 by 1 inch bores

Ruland Manufacturing

Ruland Manufacturing SPC-18-16-F Two-Piece Coupling 1 1/8 x 1 In

SKU CH-0QNM-2DD9B

Two-piece carbon steel shaft coupling joins 1 1/8 in and 1 in round keyed bores, rated to 4,000 RPM and 4,400 in-lb torque

  • Product typeCouplings, Collars & Adapters
  • Two-piece design simplifies installation on aligned shafts
  • Carbon steel construction handles up to 4,400 in-lb torque
  • Accommodates different bore sizes of 1 1/8 in and 1 in
  • Rated for continuous operation at 4,000 RPM maximum speed
  • Clearance diameter of 2.18 in fits compact machine envelopes

Precision Two-Piece Coupling

The Ruland SPC-18-16-F is a rigid shaft coupling built from carbon steel for power transmission applications. It joins a 1 1/8 in bore to a 1 in bore using a two-piece clamp design that simplifies alignment on keyed shafts. The unit handles up to 4,400 in-lb of torque at a maximum speed of 4,000 RPM with a 1 7/8 in outside diameter.

Maintenance Teams and Fixed-Speed Drives

This coupling suits maintenance crews who need to connect mismatched shaft sizes without disassembling adjacent equipment. The split construction allows installation around existing bearings or pulleys. It is not intended for applications requiring vibration damping, angular misalignment compensation or speeds beyond the rated limit.

Straightforward Clamp Installation

The two-piece body separates so each half slides onto its shaft before the cap screws are tightened to the specified torque. The keyed bores demand accurate keyway dimensions; a mismatched key will prevent full seating. Debris on the shaft or excessive tightening can distort the bore and reduce clamping force.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $153.99
Pricier than about 90% of the 693 comparable items (median $35.99).

Specifications

Product
Product typeCouplings, Collars & Adapters

Questions about this item

What shaft diameters must I already have to fit the 1 1/8 in and 1 in bores?

You need one shaft of 1 1/8 in diameter and one shaft of 1 in diameter, both round with keyways matching the 1/4 in and 1/8 in widths.

Will the 4,000 RPM limit and 4,400 in-lb torque rating suit my existing motor and driven load?

Check that your motor speed stays at or below 4,000 RPM and that peak torque does not exceed 4,400 in-lb; the carbon-steel two-piece design handles those limits.

How can I verify the coupling runs true after installation?

Rotate the assembly by hand to feel for binding, then run at low speed and confirm no vibration or wobble at the 2.18 in clearance diameter.

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