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Black oxide steel shaft collar, clamp style, one piece design

Ruland Manufacturing

Ruland Manufacturing CL-21-F Shaft Collar 1-5/16 in Steel

SKU CH-AM3G-F7QZ5

One-piece carbon-steel clamp collar with 1-5/16 in bore and 2.35 in clearance diameter

  • TypeCouplings, Collars & Adapters
  • Clamp-style collar enables quick shaft installation
  • 1-5/16 inch bore fits standard inch-dimension shafts
  • 1215 carbon steel construction provides high tensile strength
  • Black oxide finish resists corrosion in harsh environments
  • Single-piece design simplifies maintenance and replacement

1-5/16 in Steel Shaft Collar

The Ruland Manufacturing CL-21-F is a one-piece clamp collar machined from 1215 carbon steel with a black oxide finish. It fits a round bore of 1-5/16 in and suits maintenance, repair and light assembly tasks where a secure shaft hold is required.

Black Oxide 1215 Lead Free Steel

The lead-free 1215 grade and black oxide coating provide corrosion resistance without added lubricity. The alloy steel screw clamps the collar evenly around the shaft, reducing marring compared to set-screw types and allowing repositioning during alignment.

2.35 in Clearance Diameter

With an outside diameter of 2-1/8 in and a 2.35 in clearance diameter, the collar clears most adjacent components in standard inch-series drives. The 9/16 in width limits axial load capacity, so it is not suited for heavy thrust applications or high-vibration environments without additional locking.

Highlights

  • Clamp-style collar enables quick shaft installation
  • 1-5/16 inch bore fits standard inch-dimension shafts
  • 1215 carbon steel construction provides high tensile strength
  • Black oxide finish resists corrosion in harsh environments
  • Single-piece design simplifies maintenance and replacement

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

Will the clamp screw on the CL-21-F collar need periodic re-torquing after vibration exposure?

The alloy-steel clamp screw should be checked and re-torqued to the manufacturer's specification after initial run-in and at regular maintenance intervals to maintain holding power on the 1-5/16 in bore.

What is the first limitation that appears when the CL-21-F collar runs continuously under load?

The 1215 carbon-steel body with black-oxide finish will reach its yield strength before other features, limiting the sustained torque the 1-piece clamp can transmit.

How much heat does the CL-21-F collar generate during all-day operation?

The steel collar itself produces negligible heat; any temperature rise comes from friction between the 2.35 in clearance diameter and the shaft, not from the collar material.

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