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OSC21-10-A

$38.13
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Ruland OSC21-10-A, 5/8" Oldham Coupling Hub, Aluminum, Set Screw Style With Keyway, 1.313" OD, 0.590" Length

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PRODUCT SPECIFICATIONS

Ruland OSC21-10-A is a set screw oldham coupling hub with a 0.6250" bore, 3/16" keyway, 1.313" OD, and 0.590" length. It is a component of a three-piece design consisiting of two anodized aluminum hubs press fit onto a center disk. This three-piece design allows for a highly customizable coupling that easily combines clamp or set screw hubs with inch, metric, keyed, and keyless bores. Disks are available in three materials allowing the user to tailor coupling performance to their application. OSC21-10-A can accommodate all forms of misalignment and is especially useful in applications with high parallel misalignment (up to 10% of the OD). It operates with low bearing loads protecting sensitive system components such as bearings and has a balanced design for reduced vibration at speeds up to 6,000 RPM. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. OSC21-10-A is machined from bar stock that is sourced exclusively from North American mills and is RoHS3 and REACH compliant. It is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

PRODUCT SPECIFICATIONS

Dimensions

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

0.6250 in

Keyway (K)

3/16 in

Outer Diameter (OD)

1.313 in (33.3 mm)

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

0.590 in

Bore Tolerance Variance in finished bore range before installation.

+0.001 in / -0.000 in

Hub Width (LH)

0.590 in

Length (L)

1.875 in (47.6 mm)

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

+0.0000 in / -0.0005 in

Fastening Hardware

Forged Set Screw Inch or metric socket head set screw size.

M4

Number of Screws

2 ea 90° apart

Screw Material

Alloy Steel

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.

2.2 Nm

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

2.0 mm

Performance Specifications

Torque Specifications Torque is dependent on the insert selected. Please see "Recommended Inserts" to select the correct insert for your application.

Torque ratings vary with insert selection

Angular Misalignment Max angle of the shaft axes relative to each other.

0.5°

Parallel Misalignment Shafts are parallel to each other, but not in-line with each other. They are offset.

0.008 in (0.20 mm)

Max Parallel Misalignment Oldham couplings can exceed the standard parallel misalignment rating without additional bearing loads. When using at the max rating, life cycle of the insert may be impacted. The user must test for suitability.

0.131 in (3.33 mm)

Axial Motion The amount shafts can move closer to or away from each other. This is meant for thermal expansion of the shafts. No axial force can be placed on the coupling.

0.006 in (0.15 mm)

Moment of Inertia

0.0184 lb-in2

Maximum Speed

4,500 RPM

Recommended Inserts Any of these inserts will match this coupling hub.

OD21/33-AT, OD21/33-NL, OD21/33-PEK

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.

Yes

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

Yes

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

Yes

Mechanical Fuse? The disc is designed to break at a certain torque. When it reaches the torque, it breaks and power transmission stops.

Yes

Additional Information

UPC

634529118757

Country of Origin

USA

Material Specification

2024-T351 Aluminum Bar

Finish

Black Anodized

Finish Specification Surface finish specifications.

Sulfuric Anodized MIL-A-8625 Type II, Class 2 and ASTM B580 Type B Black Anodize

Manufacturer

Ruland Manufacturing

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...

Acetal Disk -10°F to 150°F (-23°C to 65°)
Nylon Disk -10°F to 130°F (-23°C to 54°C)
PEEK Disk -10°F to 300°F (-23°C to 148°C)

Weight (lbs)

0.069100

Tariff Code

8483.60.8000

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

31163015

Product Notes

Note 1

"Now available in stainless steel!"

Note 2

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

Note 3

"Torque ratings for the couplings are based on the physical limitations/failure point of the torque disks. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the disks. Please consult technical support for more assistance."

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.

CERTIFICATIONS/STANDARDS
ISO 9001:2015

Certified

Conflict Minerals

Compliant

RoHS3

Compliant

REACH

Compliant

Installation Instructions

  1. Align the bores of the OSC21-10-A oldham coupling hubs on the shafts that are to be joined and determine if the misalignment parameters are within the limits of the coupling. (Angular Misalignment: 0.5° Parallel Misalignment: 0.008 in (0.20 mm), Axial Motion: 0.006 in (0.15 mm))
  2. Rotate the hubs on the shaft so the drive tenons are located 90° from each other.
  3. Place a torque disk so one groove fits over the drive tenons of a hub and center the disk by hand.
  4. Insert a shim with the thickness of the coupling's axial motion rating into the groove of the torque disk.
  5. Slide the tenons of the second hub into the mating groove in the disk until it touches the shim stock.
  6. Fully tighten the M4 screw(s) on each hub to the recommended seating torque of 2.2 Nm using a 2.0 mm hex torque wrench.
  7. Remove the shim stock to leave a small gap between the top of the drive tenons and the torque disk to allow for axial movement.

CUSTOMER REVIEWS

OSC21-10-A
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