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 the JS21 coupling size, with a 1 5/16 in outside diameter. This inch, aluminum hub (MPN JSC21-10-A) is designed for motion…

SKU 3G-OTH-134235

Brand

RULAND MANUFACTURING

Item

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

Technical Specifications

RULAND MANUFACTURING

Manufacturer Part Number

JSC21-10-A 

Type

Inch, Aluminum 

Outside Dia

1 5/16 in 

View Full Spec Sheet

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 JS21 jaw coupling hub used for?

A RULAND MANUFACTURING JS21 jaw coupling hub is used in motion-control and power-transmission systems to connect two shafts while dampening vibration and accommodating minor misalignment. It is commonly applied in packaging machinery, conveyors, and servo-driven equipment where zero-backlash performance is required.

What are the specifications of the RULAND MANUFACTURING JSC21-10-A jaw coupling hub?

The RULAND MANUFACTURING JSC21-10-A is a zero-backlash curved jaw coupling hub in the JS21 coupling size. It has an outside diameter of 1 5/16 inches and is made of aluminum. This inch-series hub is designed for use with matching spider inserts to transmit torque without backlash.

Where to buy RULAND MANUFACTURING jaw coupling hubs worldwide?

You can source RULAND MANUFACTURING jaw coupling hubs worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the JSC21-10-A or other RULAND coupling components.

How to select the correct RULAND MANUFACTURING jaw coupling hub for an application?

To select the correct RULAND MANUFACTURING jaw coupling hub, match the coupling size (e.g., JS21) to your shaft diameters and torque requirements. Verify the outside diameter and bore size, and choose the hub material—aluminum for lower inertia, steel for higher torque. Always consult the manufacturer's catalog for load ratings.

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 →