$18.61 ea
In Production Lead Time: 1 Week or Less
Ruland AMTCL-12-3-F, M12 x 3 Acme Threaded Shaft Collar, Black Oxide Steel, One-Piece Clamp Style, 28mm OD, 11mm Width


Ruland AMTCL-12-3-F is an acme threaded one-piece shaft collar with a M12 x 2 bore, 28mm OD, and 11mm width. AMTCL-12-3-F 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. AMTCL-12-3-F 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. AMTCL-12-3-F 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. AMTCL-12-3-F is RoHS2 and REACH compliant and manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Threaded Bore B

M12 x 3

Outer Diameter OD

28 mm

Width W

11 mm

Clearance Diameter C MAX

32.0 mm

Width Tolerance

+.076 mm / -.254 mm

Fastening Hardware

Forged Clamp Screw

M4 x 12

Screw Material

Alloy Steel

Hex Wrench Size

3.0 mm

Screw Finish

Black Oxide

Seating Torque

4.6 Nm

Screw Location R

10.00 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


Ruland Manufacturing

Country of Origin


Weight (lbs.)




Product Notes

Note 1

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

Prop 65

WARNING This product can expose you to the chemical Ethylene Thiourea, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

ISO 9001:2015


Conflict Minerals







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