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Z12A Keyless Locking Assembly – High Torque Steel Expansion Sleeve
We offer worldwide shipping with various delivery options. Shipping costs and estimated delivery times depend on your location and the service you choose at checkout.
To learn more about our shipping options and delivery times, read our shipping policy.






We accept a wide range of secure payment methods for your convenience, including major credit cards, digital wallets, and other popular local payment methods.

No prepayment is required for your order. However, note that some custom or special-order items may require a prepayment. We will inform you of any such requirement during the ordering process.

Your satisfaction is important to us. If you are not completely satisfied with your purchase, you may be eligible for a refund or exchange. Please note that certain conditions and exceptions apply
Learn more about our policy for a detailed information.
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Optimize your machinery’s performance with the Z12A Expansion Sleeve. This advanced mechanical connection component is designed to replace traditional keyed joints, utilizing the principle of friction to create a powerful, rigid bond between the shaft and the hub.
How It Works: The Z12A assembly generates a massive radial clamping force through the interaction of its internal tapered surfaces when the locking bolts are tightened. This interference fit locks the components together securely, allowing for the transmission of high torque and axial loads without the play associated with keyways.
HIGH EFFICIENCY TORQUE TRANSMISSION: Provides a uniform radial clamping force over the entire contact surface. This allows for the transmission of higher torque loads compared to keyed connections, with no risk of fretting or wear.
NON-DESTRUCTIVE CONNECTION: Eliminates the need for cutting keyways or splines into the shaft. This preserves the shaft’s diameter and structural integrity, extending the overall service life of your equipment.


ZERO BACKLASH & HIGH PRECISION: The friction lock eliminates mechanical play, ensuring precise positioning and synchronization. The self-centering design guarantees excellent runout performance.
EASY INSTALLATION & ADJUSTMENT: Installation is simple and requires only a standard torque wrench. The design allows for infinite angular and axial adjustment of the hub relative to the shaft before locking.


| Expansion sleeve model | Z12 |
|---|---|
| Material | 45# Steel / Alloy Steel |
| Structure | Heavy Duty Taper Lock |
| Shaft Tolerance (Rec.) | h8 |
| Hub Tolerance (Rec.) | H8 |
| Surface Roughness | Ra ≤ 3.2 µm |
| Self-Centering | Yes |
We offer worldwide shipping with various delivery options. Shipping costs and estimated delivery times depend on your location and the service you choose at checkout.
To learn more about our shipping options and delivery times, read our shipping policy.






We accept a wide range of secure payment methods for your convenience, including major credit cards, digital wallets, and other popular local payment methods.

No prepayment is required for your order. However, note that some custom or special-order items may require a prepayment. We will inform you of any such requirement during the ordering process.

Your satisfaction is important to us. If you are not completely satisfied with your purchase, you may be eligible for a refund or exchange. Please note that certain conditions and exceptions apply
Learn more about our policy for a detailed information.
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