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Ruland SPK-10-F, 5/8" Two-Piece Shaft Collar, Black Oxide Steel, Clamp Style With Keyway, 1 5/16" OD, 0.437" Width

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Ruland SPK-10-F is a two-piece shaft collar with a 0.6250" bore, 1 5/16" OD, 0.437" width, and 3/16" keyway. 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. The keyway prevents slippage on the shaft when the shaft collar is used for positive drive. Equipment manufacturers benefit from the tightly controlled face to bore perpendicularity of Ruland shaft collars, TIR of ≤ 0.002". 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. SPK-10-F is stamped with the Ruland name and bore size for ease of identification. Halves are mated throughout the manufacturing process for proper fit and alignment. Forged screws test beyond ANSI standards to ensure maximum holding power. SPK-10-F 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. SPK-10-F 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.

0.6250 in

Bore Tolerance Variance in finished bore range before installation.

+0.0020 in / +0.0005 in

Keyway (K)

3/16 in

Width (W)

0.437 in

Outer Diameter (OD)

1 5/16 in

Width Tolerance

+0.003 in / -0.010 in

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

1.500 in

Recommended Gap The recommended gap between halves to maintain during installation. See installation instructions for more information.

0.063 in

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

+0.0000 in / -0.0005 in

Fastening Hardware

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


Screw Material

Alloy Steel

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

5/32 in

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.

76 lb-in

Screw Location (R)

0.479 in

Number of Screws

2 ea

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)




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


Tariff Code


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 SPK-10-F two-piece shaft collar as it is received.
  2. Wipe the bore clean.
  3. Apply a thin coat of light oil to the shaft.
  4. Place the collar onto the desired shaft location with the groove side as the work surface. Tighten the collar using a 5/32 in hex wrench until a slight resistance is felt.
  5. Be sure to maintain the gap of 0.063 in between the two halves of the collar during installation.
  6. Wring collar into its final position and tighten the screw to the full recommended seating torque of 76 lb-in using a 5/32 in torque wrench.


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