TLK400 Shrink Disc / PL-ADN Keyless Locking Assembly – Thin Wall, H7 Bore, Reusable

Factory direct | 45# steel or stainless steel | 12.9 high‑strength screws | Electroless nickel plating

The TLK400 series (also known as PL-ADN power lock, Z21 shrink disc, or AL-D straight single‑taper locking assembly) is a keyless locking device that eliminates the need for keyways. It provides high coaxial accuracy, easy installation, and reusability – ideal for servo motors and reversing drives.

✅ No keyway required – reduce machining time and design constraints.

Key Technical Specifications

🔧 Torque and axial force values are for reference. Actual capacity depends on shaft diameter and model – contact us for exact sizing.

Product Advantages

Product Features

✅ Eliminates Keyways – Saves Time & Enables Design Changes

• No need to cut keyways in shafts or hubs

• Reduces machining and assembly time

• Allows engineering changes at the last minute without re‑machining keyways

✅ Easy Maintenance & Reusability

• No special tools required – simple hex wrenches

• No hammering – just tighten screws progressively

• Parts can be disassembled and reused – reduces spare part costs

• Ideal for equipment that needs periodic disassembly

✅ High Precision for Reversing Drives (Servo Motors)

• Achieves long‑term high coaxial accuracy

• No backlash or lost motion due to keyway clearance

• Perfect for servo motors that frequently change direction (forward/reverse)

✅ 45# Steel – Quenched & Tempered 

• Good wear resistance and strength

• High hardness and toughness

• Forged construction – no casting defects

✅ Grade 12.9 High‑Strength Screws

• Smooth, burr‑free, uniform clamping

• No loosening under dynamic loads

✅ Electroless Nickel Plating

• Uniform coating thickness

• Excellent corrosion resistance

• Good surface hardness

✅ H7 Bore Precision

• Ensures concentricity with shaft

• Reduces vibration at high speeds

✅ Thin Wall / Single Taper Design

• Compact – fits into tight spaces

• Straight type (AL-D) for easy mounting

Applications

• CNC machine tools (spindles, feed axes)

• Servo motor shafts (no keyway needed)

• Food packaging machinery

• Metallurgical equipment

• Solar tracking systems (photovoltaic)

• Woodworking machinery

• Chemical industry equipment

• Semiconductor manufacturing

• Printing machinery

• Railway tracks & rolling stock

• Any application requiring high concentricity and easy assembly/disassembly

Why Choose Apex Coupling for TLK400 Locking Assemblies?

FAQ

Q: What is a keyless locking assembly (shrink disc)?
A: It is a friction‑based shaft‑hub connection device. By tightening screws, it creates radial pressure to transmit torque and axial force – no keyway needed.

Q: What is the difference between TLK400, PL-ADN, and Z21?
A: They are similar designs from different naming conventions. TLK400 and PL-ADN refer to the same thin‑wall, single‑taper type. Z21 is another common designation. We supply all under the same quality standard.

Q: Can I reuse the locking assembly?
A: Yes. Unlike keyways that wear, our locking assemblies can be reused multiple times – just follow the correct tightening procedure.

Q: Do I need special tools to install?
A: No. Only standard hex wrenches (Allen keys) are required. No hammering, no hydraulic tools.

Q: Is it suitable for servo motors?
A: Absolutely. The keyless design eliminates backlash and maintains high coaxial accuracy even under frequent forward/reverse rotation – ideal for servo drives.

Q: What surface finish is standard?
A: Electroless nickel plating – uniform, corrosion‑resistant, and hard. Stainless steel option available for extreme environments.

Q: How do I select the right size?
A: Send us your shaft diameter, torque, and axial force requirements. We will calculate the correct model.

Request a Quote

Send us your shaft diameter, hub bore, torque, and application details. We will reply within 24 hours with a quotation, drawing, and tightening instructions.

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