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 Jaw Coupling Hub is a zero-backlash curved jaw coupling hub in size JC21, with a 1 5/16 in outside diameter. This inch-series aluminum hub (MPN JCC21-8-A) is designed for motion-control…

SKU 3G-OTH-134192

Also listed as: JCC218A · JCC21 8 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

JCC21-8-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 power transmission applications, transmitting torque while accommodating minor misalignment. It is commonly used in motion control, packaging, and conveyor systems where zero-backlash and dampening of vibration are required.

What are the specifications of the Ruland JCC21-8-A jaw coupling hub?

The Ruland JCC21-8-A is an inch-series, zero-backlash curved jaw coupling hub made of aluminum. It has a 1 5/16 in outside diameter and is designed for JC21 coupling size. This hub is suitable for applications needing lightweight, corrosion-resistant components.

Where to buy Ruland Manufacturing jaw coupling hubs worldwide?

3G Electric supplies Ruland Manufacturing jaw coupling hubs like the JCC21-8-A to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this and other power transmission components.

How to select the correct Ruland jaw coupling hub size?

To select the correct Ruland jaw coupling hub, match the outside diameter and bore size to your shaft dimensions and torque requirements. The JCC21-8-A fits JC21 couplings with a 1 5/16 in OD. Always verify shaft keyway and set screw specifications for a secure fit.

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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