Special Price $19.73 ea Regular Price $85.34 ea
Quantity Price (USD)
1 $19.73 ea
20 $11.84 ea
100 $9.87 ea
200 $8.88 ea
In Production Lead Time: 1 Week or Less
Ruland MTCL-20-2.5-F-LH, M20 x 2.5 Left Hand Threaded Shaft Collar, Black Oxide Steel, One-Piece Clamp Style, 40mm OD, 15mm Width


Ruland MTCL-20-2.5-F-LH is a left hand threaded one-piece shaft collar with a M20 x 2.5 bore, 40mm OD, and 15mm width. MTCL-20-2.5-F-LH has higher axial holding power than round bore shaft collars of similar size. Ruland double taps threads to ensure a precise and burr-free finish allowing for easy installation and removal, proper fit, and extended shaft life. The clamp style design will not mar the shaft. MTCL-20-2.5-F-LH 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. MTCL-20-2.5-F-LH is stamped with the Ruland name and bore size for ease of identification. Forged screws test beyond DIN 912 12.9 standards to ensure maximum holding power. It is machined from solid bar stock to a fine burr free finish and sourced exclusively from North American mills. Ruland uses 1215 lead-free steel with a proprietary black oxide finish that produces a fine glossy finish while increasing holding power and resisting corrosion. MTCL-20-2.5-F-LH is RoHS2 and REACH compliant and manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Threaded Bore B

M20 x 2.5

Outer Diameter OD

40 mm

Width W

15 mm

Clearance Diameter C MAX

47.4 mm

Width Tolerance

+.076 mm / -.254 mm

Fastening Hardware

Forged Clamp Screw


Screw Material

Alloy Steel

Hex Wrench Size

5.0 mm

Screw Finish

Black Oxide

Seating Torque

16 Nm

Screw Location R

14.70 mm

Number of Screws

1 ea

Additional Information

Material Specification

1215 Carbon Steel Bar


-40°F to 350°F
-40°C to 176°C

Finish Specification

Hot Process Black Oxide, Impregnated with Naphthenic Oil, Centrifugally Dried

Country of Origin


Weight (lbs.)


ISO 9001:2015


Conflict Minerals







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