RULAND MANUFACTURINGZero-Backlash Curved Jaw Coupling Hubs

RULAND MANUFACTURING Jaw Coupling Hub: JC21 Coupling Size, 1 5/16 in Outside Dia, Inch

The RULAND MANUFACTURING JC21-6-A is a zero-backlash curved jaw coupling hub in the JC21 coupling size, made of inch-dimension aluminum with a 1 5/16 in outside diameter. This hub is designed for motion-control…

SKU 3G-OTH-134259

Also listed as: JC216A · JC21 6 A

Brand

RULAND MANUFACTURING

Item

Jaw Coupling Hub: JC21 Coupling Size, 1 5/16 in Outside Dia, Inch

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

JC21-6-A 

Type

Inch, Aluminum 

Outside Dia

1 5/16 in 

Technical Documents

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RULAND MANUFACTURING Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is a Ruland Manufacturing jaw coupling hub used for?

A Ruland Manufacturing jaw coupling hub connects two shafts in motion-control systems, transmitting torque while accommodating minor misalignment. It is commonly used in servo motors, encoders, and industrial automation equipment where zero-backlash operation is critical for precision positioning and reduced vibration.

What are the specifications of the Ruland Manufacturing JC21-6-A jaw coupling hub?

The Ruland Manufacturing JC21-6-A is a zero-backlash curved jaw coupling hub in the JC21 coupling size. It has a 1 5/16 in outside diameter, is made of aluminum, and is designed for inch-series shafts. The manufacturer part number is JC21-6-A.

Where to buy a Ruland Manufacturing JC21-6-A jaw coupling hub worldwide?

3G Electric supplies and delivers the Ruland Manufacturing JC21-6-A jaw coupling hub worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to ensure your order reaches any international destination. Contact us for availability and lead time.

How to select the correct Ruland Manufacturing jaw coupling hub size?

To select the correct Ruland Manufacturing jaw coupling hub, match the coupling size (e.g., JC21) to your shaft diameters and torque requirements. Verify the outside diameter (1 5/16 in for JC21) and material (aluminum for low inertia). Always consult the manufacturer's catalog for bore and keyway specifications.

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 zero-backlash curved jaw coupling hubs. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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