RULAND MANUFACTURINGZero-Backlash Curved Jaw Coupling Hubs

RULAND MANUFACTURING Jaw Coupling Hub: JS21 Coupling Size, 1 5/16 in Outside Dia, Inch

The RULAND MANUFACTURING Jaw Coupling Hub is a zero-backlash curved jaw coupling hub in JS21 coupling size, with a 1 5/16 in outside diameter. This inch-series aluminum hub (MPN JSC21-6-A) is designed for…

SKU 3G-OTH-134305

Also listed as: JSC216A · JSC21 6 A

Brand

RULAND MANUFACTURING

Item

Jaw Coupling Hub: JS21 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

JSC21-6-A 

Type

Inch, Aluminum 

Outside Dia

1 5/16 in 

Technical Documents

No technical documents available for this product.

Request documentation →

Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.

Talk to an engineer

Ask a question

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 and reliable power transmission are required.

What are the specifications of the Ruland JSC21-6-A jaw coupling hub?

The Ruland JSC21-6-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 JS21 coupling size. The manufacturer part number is JSC21-6-A.

Where to buy Ruland Manufacturing jaw coupling hubs worldwide?

3G Electric supplies Ruland Manufacturing jaw coupling hubs worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on the JSC21-6-A or other Ruland coupling components.

How to select the correct Ruland jaw coupling hub for my application?

To select the correct Ruland jaw coupling hub, match the coupling size (e.g., JS21) to your shaft diameters and torque requirements. Verify the outside diameter and material—aluminum for low inertia, steel for higher torque. Ensure zero-backlash curved jaw design fits your motion-control needs.

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.

Browse all RULAND MANUFACTURING products →Contact our engineers →