Z22 Keyless Power Lock Assembly – 45# Steel / GCr15, 12.9 Grade Screws, High Precision Locking Device

Factory direct | 45# carbon steel or GCr15 bearing steel | 12.9 grade high-strength screws | 15–100mm bore range | 5000 N·m max torque | Black oxide or nickel plating | OEM/ODM/OBM

The Apexcoupling Z22 series is a high-precision keyless power lock assembly (also known as a shaft locking device, shrink disc, or clamping element) designed for reliable friction-based shaft-to-hub connections in industrial power transmission. Featuring a backlash-free design, this locking assembly securely connects gears, pulleys, sprockets, impellers, and other transmission components to shafts without the need for keyways or threads. Manufactured from 45# carbon steel or GCr15 bearing steel with 12.9 grade high-strength screws, it delivers exceptional clamping force, torque transmission capacity, and durability. Available with black oxide or nickel plating surface treatments, the Z22 series is the ideal solution for manufacturing plants, farms, construction works, energy & mining, and general industrial machinery.

✅ Keyless friction-lock connection – no keyways, no backlash, no shaft weakening. Easy installation and removal – no heating, cooling, or special tools required.

Key Technical Specifications

🔧 Custom bore sizes, materials, surface finishes, and special designs available. Contact us with your specifications.

Z22 Series – Standard Model Range

📐 All models feature 12.9 grade high-strength screws.

Product Structure

The Z22 keyless power lock assembly consists of four main components:

1. Split Inner Ring – Tapered on both ends, fits over the shaft.

2. Upper Outer Ring – Tapered, fits into the hub bore.

3. Lower Outer Ring – Tapered, works with the upper outer ring.

4. 12.9 Grade High-Strength Screws – When tightened, they draw the components together, creating radial clamping pressure.

💡 How it works: When the 12.9 grade screws are tightened, the tapered rings are forced together, creating high radial pressure between the inner ring and the shaft, and between the outer rings and the hub bore. This friction-lock connection transmits torque and axial forces without any keyways, backlash, or relative motion.

Product Features & Advantages

Applications

• Manufacturing Plants – General power transmission, conveyor systems

• Farms & Agriculture – Agricultural machinery, PTO drives

• Construction Works – Heavy equipment, building material handling

• Energy & Mining – Crushers, conveyors, feeders, mills

• Packaging Machinery – Wrapping machines, conveyors, indexing drives

• Textile Machinery – Spinning, weaving, finishing equipment

• Printing Machinery – Presses, finishing equipment

• CNC Machine Tools – Precision positioning, spindle drives

• Automation Equipment – Robotics, pick-and-place systems

• Wind Turbines – Main shaft connections

• Gearboxes – Input/output shaft connections

• Pulleys, Sprockets, Gears, Impellers – Direct shaft-to-hub connections

Why Choose Apex Coupling for Z22 Locking Assemblies?

FAQ

Q: What is a keyless power lock assembly?
A: A keyless power lock assembly (also called a shaft locking device, shrink disc, or clamping element) is a friction-based mechanical device that connects a hub to a shaft without using keys or keyways. It transmits torque and axial forces through radial clamping pressure.

Q: What is the advantage of keyless connection over keyways?
A: Keyless connections eliminate keyway stress concentrations, backlash, and shaft weakening. They also allow for easy axial and radial adjustment during installation, easy removal, and overload protection.

Q: What materials are available?
A: Standard material is 45# carbon steel. We also offer GCr15 bearing steel for higher hardness and wear resistance.

Q: What is the bore diameter range?
A: Standard Z22 series covers 15 mm to 100 mm. Custom sizes available on request.

Q: What is the maximum torque?
A: Standard rating is 5000 N·m. Custom higher torque capacities available on request.

Q: What grade are the screws?
A: All Z22 locking assemblies feature 12.9 grade high-strength screws.

Q: What surface finishes are available?
A: Standard is black oxide. We also offer nickel plating for enhanced corrosion resistance.

Q: Is the assembly easy to install?
A: Yes. No heating, cooling, or special tools are required – simply tighten the screws to the specified torque.

Q: Can the assembly be reused?
A: Yes. The Z22 locking assembly can be disassembled and reinstalled multiple times without damage.

Q: Does the assembly provide overload protection?
A: Yes. Under extreme overload, the assembly will slip, protecting connected equipment from damage.

Request a Quote

Send us your shaft diameter, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.