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Ruland SPC-22-22-SS, 1-3/8" x 1-3/8" Rigid Coupling, 303 Stainless Steel, Two-Piece Clamp Style With Keyway, 2 1/2" OD, 3 5/8" Length

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Ruland SPC-22-22-SS is a two-piece rigid coupling with 1.3750" x 1.3750" bores, 2 1/2" OD, 3 5/8" length, and 5/16" x 5/16" keyways. It has precision honed bores to ensure they are collinear and do not introduce misalignment or vibration into the system making it suitable for high precision servo appliactions as well as shaft to shaft connections. SPC-22-22-SS 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 ANSI standards to ensure maximum holding power. Tightly controlled bore tolerance of +.002"/+.0005" is maintained. SPC-22-22-SS is made from 303 stainless steel with hardware of like material for consistent corrosion resistance. It is machined from solid bar stock that is sourced exclusively from North American mills and is RoHS3 and REACH compliant. SPC-22-22-SS is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Bore (B1) Larger inner diameter. Should match nominal shaft diameter.

1.3750 in

Small Bore (B2) Smaller inner diameter. Should match nominal shaft diameter.

1.3750 in

Keyway (K1)

5/16 in

Keyway (K2)

5/16 in

B1 Max Shaft Penetration The maximum depth the shaft can penetrate into Bore B1.

1.812 in

B2 Max Shaft Penetration The maximum depth the shaft can penetrate into Bore B2.

1.812 in

Outer Diameter (OD)

2 1/2 in

Bore Tolerance Variance in finished bore range before installation.

+0.0020 in / +0.0005 in

Length (L)

3 5/8 in

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

2.772 in

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

0.094 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

18-8 300 Series Stainless Steel with Nypatch®

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

1/4 in

Screw Finish Surface finish and treatments on supplied hardware.


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

190 lb-in

Screw Location (R)

0.986 in

Number of Screws

8 ea

Performance Specifications

Rated Torque Keyed Rigids have an increased torque capability beyond the Rated Torque. The max torque becomes based on the physical limitations of the key that is used.

2900 in-lb

Moment of Inertia

3.3495 lb-in2

Maximum Speed

4,000 RPM

Full Bearing Support Required? Full bearing support is a bearing in close proximity to both sides of the coupling to prevent axial loads that could result in rapid coupling failure.


Nypatch® Anti-Vibration Hardware? This proprietary coating allows for repeated installations, prevents screws from coming loose during operation, and provides the necessary dissimilar material in stainless steel couplings to reduce galling.


Precision Honed Bores? Honing ensures bores are collinear.


Zero-Backlash? Zero-backlash ensures there is no loss of motion during operation.


Balanced Design The balanced design allows for reduced vibration at high RPMs.


Additional Information

Material Specification

Type 303 Austenitic, Non-Magnetic 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.

Bright, No Plating


Ruland Manufacturing

Country of Origin


Weight (lbs)




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 Nickel (metallic), known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

ISO 9001:2015


Conflict Minerals






Installation Instructions

  1. Align the SPC-22-22-SS two-piece rigid coupling on the two shafts to be connected. There should be no misalignment.
  2. Tighten the Nypatch® screws in two stages, starting with the inside screws. Using a 1/4 in torque wrench, tighten the inside screws to 95 lb-in which is half the recommended seating torque. Repeat the process for the outside screws, tightening to half the recommended seating torque.
  3. Be sure to maintain the gap of 0.094 in between the two halves during installation.
  4. Tighten the screws to the full recommended seating torque of 190 lb-in following the same pattern, starting with the inside screws first.
  5. For optimum results do not exceed the shaft penetration length of 1.812 in.


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