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Ruland TCN-07-F, N-07 (1.376" - 18 TPI) Bearing Locknut, Black Oxide Steel, One-Piece Clamp Style, 2 1/4" OD, 0.500" Width


Ruland TCN-07-F is a clamp type bearing locknut with a 1.376" - 18 TPI bore, 2 1/4" OD, and 0.500" width. It is manufactured to AFBMA standards and designed for use on high precision spindle bearings. 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. 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 ≤ .0010"). 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. TCN-07-F is stamped with the Ruland name and locknut size for ease of identification. Forged screws test beyond DIN 912 12.9 standards to ensure maximum holding power. It is manufactured from solid bar stock sourced from select North American mills and machined to a fine burr free finish. 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. TCN-07-F is RoHS3 and REACH compliant and manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Locknut Industry Standard


Threaded Bore (B1)

1.376 in - 18 TPI

Thread Class The thread class standard that Ruland manufactures to.


Bearing Face Diameter (S)

1 13/16 in

Bearing Face Max TIR

0.0010 in

Outer Diameter (OD)

2 1/4 in

Width (W)

0.500 in

Fastening Hardware

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

M5 x 16

Screw Material

Alloy 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.

Black Oxide

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

9.5 Nm

Screw Location (R)

0.880 in

Number of Screws

1 ea

Recommended Installation Tools

Recommended Spanner Wrench This spanner wrench helps to ensure precision seating of the locknut.

SWR:M35-60-F, SWR:M35-60-SS

Additional Information

Material Specification

1215 Carbon Steel 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.

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


Ruland Manufacturing

Country of Origin


Weight (lbs)


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

+0.0000 in / -0.0005 in



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 Ethylene Thiourea, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

ISO 9001:2015


Conflict Minerals






Installation Instructions

  1. Use the TCN-07-F bearing locknut as it is received.
  2. Wipe the bore clean.
  3. Apply a thin coat of light oil to the shaft.
  4. Place the bearing locknut onto the desired shaft location using a spanner wrench. Tighten it using a 4.0 mm hex wrench until a slight resistance is felt.
  5. Wring collar into its final position and tighten the screw to the full recommended seating torque of 9.5 Nm using a 4.0 mm torque wrench.


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