# Jaw Coupling Hub, 5/16in., Aluminum

Jaw Coupling Hub, Coupling Size JC21, Outside Diameter 1 5/16 in, Coupling Overall Length 1 3/4 in, System of Measurement Inch, Hub Material Aluminum, Maximum Speed 8,000 RPM, Keyway Depth Not Applicable, Keyway Width Not Applicable, Bore Diameter 5/16 in, Shaft Locking Type Clamp On, Bore Type Round Bore, Jaw Profile Curved, Screw Thread Size M3, Bore Tolerance +0.002/-0.000 in, Fail Safe Yes, Shaft Tolerance +0.0000/-0.0005 in, Full Bearing Support Required Yes, Hub Diameter 1 5/16 in

graingerSKU: 30UN73, mscSKU: , zoro\_no: G7881806, mongo\_id: 65bbe9ad22d7a989a996dc71

## Details

- **Price:** 39.86 USD
- **Vendor:** Ruland
- **Type:** Jaw Type Couplings
- **Tags:** DESCRIPTION_UPDATE

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.86 USD | In stock |

## Images

- Z0oJ9_jcpEx_.JPG

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> Source: [The Tools Man](https://www.thetoolsman.com/products/ruland-jaw-coupling-hub-516in-aluminum-jc21-5-a)
> Updated: 2026-09-01