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Ruland MWCLK-16-SS, 16mm Double Wide Shaft Collar, 303 Stainless Steel, One-Piece Clamp Style with Keyway, 34mm OD, 27.6mm Width

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Ruland MWCLK-16-SS is a one-piece shaft collar with a 16mm bore, 5mm keyway, 34mm OD, and 27.6mm width. The clamp style design does not mar the shaft, is easy to remove, and is indefinitely adjustable. It is commonly used for guiding, spacing, stopping, mounting, and component alignment. Equipment manufacturers benefit from the tightly controlled face to bore perpendicularity (TIR of ≤ .05mm). Perpendicularity is critical for alignment when the shaft collar is used as a load bearing face, mechanical stop, or for mounting components such as gears or bearings. Proprietary processes have been developed by Ruland to maintain superior fit, finish, and holding power. MWCLK-16-SS is stamped with the Ruland name and bore size for ease of identification. This double wide shaft collar has 25% higher axial holding power than a round bore of equivalent size. It can also be used as a short rigid coupling for applications where a traditional rigid coupling is too long. Forged screws test beyond DIN 912 12.9 standards to ensure maximum holding power. MWCLK-16-SS is machined from solid bar stock to a fine burr free finish and sourced exclusively from North American mills. Ruland uses 303 stainless steel with hardware of like material for consistent corrosion resistance. Stainless steel hardware undergoes a proprietary surface treatment process to prevent galling. It is RoHS3 and REACH compliant and manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Bore (B1) Larger inner diameter. Should match nominal shaft diameter.

16 mm

Small Bore (B2) Smaller inner diameter. Should match nominal shaft diameter.

16 mm

Keyway (K1)

5 mm

Keyway (K2)

5 mm

Outer Diameter (OD)

34 mm

Bore Tolerance Variance in finished bore range before installation.

+0.050 mm / +0.012 mm

Width (W)

27.6 mm

Clearance Diameter (C) MAX Minimum diameter required to avoid interference with hardware.

39.3 mm

Recommended Shaft Tolerance Acceptable variance in nominal shaft diameter before performance loss.

+0.000 mm / -0.013 mm

Fastening Hardware

Forged Clamp Screw Inch or metric socket head cap screw size.


Screw Material

18-8 300 Series Stainless Steel

Hex Wrench Size Wrench size that fits the screw head to tighten or loosen the screw.

4.0 mm

Screw Finish Surface finish and treatments on supplied hardware.


Seating Torque Torque required to install supplied hardware. Use torque wrench for accurate seating torque.

5.4 Nm

Screw Location (R)

12.50 mm

Number of Screws

2 ea

Additional Information

Material Specification

Type 303 Austenitic, Non-Magnetic Bar

Temperature Minimum and maximum operating temperature. Operating temperature includes ambient temperature plus or minus factors such as system heat generated during operation, washdown, vacuum, etc...

-40°F to 350°F (-40°C to 176°C)

Finish Specification Surface finish specifications.

Bright, No Plating


Ruland Manufacturing

Country of Origin


Moment of Inertia

2.517 x 10-6 kg-m2

Weight (lbs)




Tariff Code


UNSPC Code used to identify products to standardize nomenclature around the world.


Product Notes

Note 1

Performance ratings are for guidance only. The user must determine suitability for a particular application.

Prop 65 Required for the US State of California only.

WARNING This product can expose you to the chemical Nickel (metallic)

ISO 9001:2015


Conflict Minerals






Installation Instructions

  1. Use the MWCLK-16-SS double wide shaft collar as it is received.
  2. Wipe the bore clean.
  3. Apply a thin coat of light oil to the shaft.
  4. Tighten the screws in two stages, starting with the inside screws. Using a torque wrench with 4.0 mm bit, tighten the inside screws to 2.7 Nm which is half the recommended seating torque. Repeat for the outside screws, again tightening to half of the recommended seating torque.
  5. Tighten the screws to the full recommended seating torque of 5.4 Nm following the same pattern, starting with the inside screws first.


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