RULAND MANUFACTURINGSet Screw Oldham Coupling Hubs for Round Shafts

RULAND MANUFACTURING Motion Control Coupling Hub: 0.5° Angular Misalignment

The RULAND MANUFACTURING Motion Control Coupling Hub (MPN OST21-8-A) is a set screw Oldham coupling hub for round shafts, designed for 0.5° angular misalignment and 0.006 in axial motion. This hub is part of the…

SKU 3G-OTH-141156

Also listed as: OST218A · OST21 8 A

Brand

RULAND MANUFACTURING

Item

Motion Control Coupling Hub: 0.5° Angular Misalignment

Local availability & support

Delivery: Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment: Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

RULAND MANUFACTURING

Manufacturer Part Number

OST21-8-A 

Axial Motion

0.006 in 

Technical Documents

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RULAND MANUFACTURING Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is the RULAND MANUFACTURING OST21-8-A coupling hub used for?

The RULAND MANUFACTURING OST21-8-A is a set screw Oldham coupling hub for round shafts. It is used in motion control applications to transmit torque while accommodating 0.5° angular misalignment and 0.006 in axial motion, protecting connected equipment from misalignment-induced wear.

What are the specifications of the RULAND MANUFACTURING OST21-8-A?

The RULAND MANUFACTURING OST21-8-A is a set screw Oldham coupling hub from the OST21 series. It allows 0.5° angular misalignment and 0.006 in axial motion. The manufacturer part number is OST21-8-A, and it is designed for round shafts.

Where to buy the RULAND MANUFACTURING OST21-8-A worldwide?

You can source the RULAND MANUFACTURING OST21-8-A through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring the coupling hub reaches your facility reliably.

How to select the correct RULAND MANUFACTURING Oldham coupling hub?

To select the correct RULAND MANUFACTURING Oldham coupling hub, match the shaft diameter and keyway dimensions to your application. Consider the required torque, misalignment tolerance (0.5° angular, 0.006 in axial), and operating speed. Consult RULAND's technical data for precise sizing.

Used in

Common applications for RULAND MANUFACTURING

Automated packaging machinery — Ruland beam couplings (e.g., PSR20-8-5-A) for connecting servo motors to conveyor drive shafts.

CNC machine tools — Ruland rigid couplings (e.g., CLX-4-4-A) for precise alignment of ball screw assemblies.

Robotic arm joints — Ruland Oldham coupling hubs (e.g., OSC16-6-A) for accommodating axial motion in end-effector drives.

Pump and compressor systems — Ruland stainless steel shaft collars (e.g., CL-3-ST) for securing impeller shafts.

Printing press rollers — Ruland clamp-on beam couplings (e.g., PCR18-8-8-A) for synchronizing roller rotation with minimal backlash.

Material handling conveyors — Ruland set screw couplings (e.g., PSMR29-7-7-A) for linking gearboxes to drive rollers.

RULAND MANUFACTURING Products

3G Electric supplies RULAND MANUFACTURING set screw oldham coupling hubs for round shafts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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