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One-piece steel shaft collar, 18 mm outer diameter, clamp style

Ruland Manufacturing

Ruland Manufacturing MCL-8-F Shaft Collar 8mm Steel

SKU CH-AWFC-TT2Q4

One-piece carbon-steel clamp collar with 8 mm bore, 18 mm OD and alloy-steel screw for secure shaft holding

  • TypeCouplings, Collars & Adapters
  • Secure clamping with 1-piece carbon steel construction
  • Precise 8 mm metric bore fits standard shafts
  • 1215 grade steel resists wear under load
  • 18 mm outside diameter suits compact assemblies
  • Alloy steel screw delivers strong holding force

Precision 8 mm Shaft Collar

The Ruland MCL-8-F is a one-piece clamp collar machined from 1215 carbon steel with an alloy-steel screw. It fits an 8 mm round bore and provides axial positioning on metric shafts for automation, robotics and general machine-shop assemblies.

Clamp Force and Clearance Limits

The single-screw clamp relies on friction between the 18 mm outside diameter and the shaft; torque capacity is therefore limited by screw tension and surface finish rather than a keyway. A 22.4 mm clearance diameter restricts use where adjacent components sit closer than that envelope.

Replaces Set-Screw Collars on Finished Shafts

The clamp design eliminates the marring and loosening common with set-screw collars on hardened or precision-ground shafts. The upgrade is worthwhile whenever shaft damage must be avoided or when frequent repositioning is required.

Highlights

  • Secure clamping with 1-piece carbon steel construction
  • Precise 8 mm metric bore fits standard shafts
  • 1215 grade steel resists wear under load
  • 18 mm outside diameter suits compact assemblies
  • Alloy steel screw delivers strong holding force

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

Should I choose the 8 mm bore or a different size for my 8 mm shaft?

The bore diameter is 8 mm, matching an 8 mm shaft exactly; select this size when your shaft measures 8 mm.

What does the 18 mm outside diameter mean when the collar is installed?

The collar’s outside diameter is 18 mm, so it adds 9 mm of radial clearance beyond the shaft surface once clamped.

How does the single-piece clamp design with an alloy-steel screw affect holding power?

The 1-piece carbon-steel collar (grade 1215) uses an alloy-steel screw to generate uniform clamping force around the 8 mm bore without marring the shaft.

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