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Ruland MSPC-8-8-F, 8mm x 8mm Rigid Coupling, Black Oxide Steel, Two-Piece Clamp Style With Keyway, 24mm OD, 35mm Length


Ruland MSPC-8-8-F is a two-piece rigid coupling with 8mm x 8mm bores, 2mm x 2mm keyways, 24mm OD, and 35mm length. It has precision honed bores on to ensure bores are collinear and does not introduce misalignment or vibration into the system making it suitable for high precision servo applications as well as shaft to shaft connections. MSPC-8-8-F has opposing hardware for a balanced design. Proprietary Nypatch® anti-vibration coating on hardware allows for even seating of the screw, repeated screw installations, prevents galling, and maintains high holding power. It eliminates the need to treat screws upon receipt greatly reducing installation time. Forged screws test beyond DIN 912 12.9 standards to ensure maximum holding power. Tightly controlled bore tolerance of +.050mm/+.012mm is maintained. MSPC-8-8-F is made from 1215 lead-free steel with a proprietary black oxide finish that produces a fine glossy finish while increasing holding power and resisting corrosion. It is machined from solid bar stock that is sourced exclusively from North American mills and is RoHS2 and REACH compliant. MSPC-8-8-F is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Large Bore B1

8 mm

Small Bore B2

8 mm

Keyway K1

2 mm

Keyway K2

2 mm

B1 Shaft Penetration

17.5 mm

B2 Shaft Penetration

17.5 mm

Outer Diameter OD

24 mm

Bore Tolerance

+.050 mm / +.012 mm

Length L

35 mm

Clearance Diameter C MAX

27.1 mm

Fastening Hardware

Forged Clamp Screw


Screw Material

Alloy Steel with Nypatch®

Hex Wrench Size

2.5 mm

Screw Finish

Black Oxide

Seating Torque

2.1 Nm

Screw Location R

9.0 mm

Number of Screws

8 ea

Performance Specifications

Rated Torque

50 Nm

Maximum Speed

4,000 RPM

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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