Description
TS7Z40×75 Locking Assembly – 40mm Shaft 75mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z40×75 is a high-demand model in the TS7Z range, serving the 40 mm shaft size standard in IEC frame 200 and 225 motors across the 22–55 kW industrial drive class. The 75 mm outer diameter — shared across three bore sizes — allows standardised hub designs, and the 0.592 kN·m torque rating with 31.2 kN axial capacity covers the full torque range of these motor sizes. For a complete listing of all TS7Z locking assembly models, visit our product catalog.
The TS7Z locking assembly operates on the principle of tapered ring compression: two tapered steel rings — inner and outer — are drawn together axially by the clamping screws. The taper geometry converts axial screw preload into a radial clamping force, expanding the inner ring against the shaft surface and contracting the outer ring against the hub bore simultaneously. The resulting surface pressure — 67 MPa for the TS7Z40×75 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 0.592 kN·m) and axial force (Ft = 31.2 kN) without any mechanical interlock element. No keyway is required in either the shaft or the hub bore.
The elimination of the keyway is the principal engineering advantage of the TS7Z over traditional keyed hub connections. A keyway introduces a stress concentration at its corners that can initiate fatigue cracks under the cyclic torsion loading of a rotating drive — particularly at high surface hardness or in applications with frequent torque reversals. The TS7Z distributes torque loading uniformly around the full circumference of the shaft bore, eliminating this stress riser and significantly extending the fatigue life of the connected shafts. For high-cycle, high-torque drives — mills, fans, compressors, and crushers — this durability improvement is a primary selection rationale.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | TS7Z40×75 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 40 mm |
| Outer Diameter (D) | 75 mm |
| Rated Axial Force (Ft) | 31.2 kN |
| Rated Torque (Mt) | 0.592 kN·m |
| Surface Pressure (Ps) | 67 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 1.4 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z40×75 requires the shaft surface to be clean, dry, and within an h6 or k6 shaft tolerance, with a surface finish of Ra 0.8–1.6 μm. The hub bore should be machined to H7 tolerance. Clamping screw threads and head bearing faces must be lubricated with MoS₂ paste before installation to ensure the M_a = 42 N·m tightening torque produces the correct clamping force. Tighten all screws in a star pattern in at least three progressive passes — do not fully tighten one screw before the others.
To verify shaft material suitability, check: Ps (67 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 67 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 67 MPa for this model. If the shaft material yield strength is insufficient, contact our contact our team for a re-rated configuration.
Keyless Design
No keyway in shaft or hub. Eliminates keyway stress concentration and fretting wear. Angular position can be set freely — no keyway angular constraint.
Self-Releasing Disassembly
Back off clamping screws in a star pattern — the taper geometry produces a self-releasing action requiring no extraction tools or heat. Shaft and hub surfaces are undamaged after removal.
Uniform Load Distribution
Torque is transmitted through friction uniformly around the full shaft circumference, distributing stress evenly and enabling the same torque to be carried at lower peak shaft stress than a keyed connection.
Bidirectional Torque
Frictional connection transmits equal torque in both rotational directions. No directional constraint — suitable for reversing drive applications without additional design consideration.
Customer Reviews and Case Studies
★★★★★
Canada — Conveyor Systems Integrator
The TS7Z40×75 is our standard for drive shaft connections on heavy-duty belt conveyor drives rated above 200 kW. The locking assembly installation is reproducible and the torque capacity is well-documented, which simplifies our site installation procedures and maintenance handover documentation.
— Technical Director, Vancouver
★★★★★
Sweden — Rubber Processing Equipment
We use the TS7Z40×75 for open mill roll drive connections. The locking assembly’s keyless design allows roll changes without machining a new keyway each time a replacement roll is fitted — a significant time saving in our maintenance workflow.
— Project Manager, Gothenburg
★★★★☆
Japan — Printing Machine Manufacturing
Used in web offset printing press ink roller drive connections. The locking assembly’s zero-backlash rigid connection is essential for print registration accuracy — any shaft play would appear directly as registration error in the printed product. The TS7Z40×75 has maintained its position integrity through our planned maintenance disassembly cycles.
— Engineering Lead, Osaka
Frequently Asked Questions
Can a locking assembly be reused after disassembly?
Yes. TS7Z locking assemblies can be disassembled and reused, provided the shaft and hub bore surfaces are inspected and show no scoring, corrosion, or fretting damage. Clean and lubricate the tapered contact surfaces before reassembly and retighten to the specified M_a torque.
Is the TS7Z suitable for reversing torque applications?
Yes. The locking assembly transmits torque equally in both rotational directions through friction — direction of rotation does not affect the connection. For applications with torque reversal, the safety factor on the rated torque should account for any dynamic amplification of the reversal shock.
How does the TS7Z locking assembly compare to a keyed connection?
A locking assembly distributes torque and axial force uniformly around the shaft circumference through friction, eliminating the stress concentration of a keyway. This typically allows the same torque to be transmitted through a smaller shaft diameter, or significantly extends fatigue life at the same shaft size. Locking assemblies also allow precise angular positioning, which is not possible with a keyed connection unless the keyway is machined to a specific angular reference.
Can the TS7Z be installed and removed without special tools?
Installation requires only a calibrated torque wrench with the correct hex key bit for the clamping screws. Removal is performed by loosening the clamping screws in a star pattern — the tapered ring geometry produces a self-releasing action as the screws are backed off. No hydraulic or heating tools are required for standard installations.
Can the TS7Z accommodate shaft misalignment?
No. The TS7Z is a rigid locking assembly and does not accommodate angular, parallel, or axial misalignment. Shaft and hub bore must be accurately aligned before installation. Any misalignment will be transmitted as a bending moment to the shaft and hub, reducing fatigue life.
Source the TS7Z40×75 Locking Assembly
Ever Power manufactures the TS7Z40×75 and the complete TS7Z locking assembly series — 31 bore sizes from 15 mm to 110 mm — direct from our factory. Provide your shaft diameter, hub bore, application torque, and quantity for a prompt technical review and factory-direct pricing.