Description
TS7Z45×85 Locking Assembly – 45mm Shaft 85mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z45×85 represents a significant step up in torque capacity: Ft reaches 46.8 kN and Mt reaches 0.982 kN·m — more than double the corresponding values for the 40 mm bore models. The 45 mm shaft size is standard in IEC frame 250 motors and large gearbox output shafts in the 55–110 kW drive class, making this model one of the most widely used locking assemblies in medium-to-large industrial drive applications. 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 — 74 MPa for the TS7Z45×85 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 0.982 kN·m) and axial force (Ft = 46.8 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 | TS7Z45×85 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 45 mm |
| Outer Diameter (D) | 85 mm |
| Rated Axial Force (Ft) | 46.8 kN |
| Rated Torque (Mt) | 0.982 kN·m |
| Surface Pressure (Ps) | 74 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 2.3 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z45×85 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 (74 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 74 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 74 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
★★★★★
Mexico — Textile Machinery OEM
Specified for weaving machine main shaft connections. The TS7Z45×85 provides a vibration-resistant keyless connection that eliminates the micro-fretting wear we experienced with key-and-keyway connections under the high-cycle, low-amplitude vibration loading of our textile machinery.
— Technical Buyer, Monterrey
★★★★★
Norway — Oil & Gas Field Equipment
We use the TS7Z45×85 for mud pump crankshaft to drive shaft connections at our drilling facility. The locking assembly’s keyless design eliminates the keyway stress riser from the crankshaft, which was a fatigue crack initiation concern at our previous scheduled inspection.
— Systems Engineer, Stavanger
★★★★☆
Belgium — Industrial Fan Manufacturing
Used in industrial fan impeller hub connections in our power station forced-draft fan installations. The TS7Z45×85’s even radial preload distribution minimises hub distortion under the fan’s rotor dynamic loading, which is important for maintaining the dynamic balance quality of the assembled fan rotor.
— Technical Manager, Ghent
Frequently Asked Questions
What clamping screw type is used in the TS7Z?
The TS7Z uses socket head cap screws (hexagon socket, DIN 912 equivalent) of appropriate size for each frame. A hex key of the correct size must be used for installation and removal. The screw size varies by TS7Z model — refer to the product drawing or contact Ever Power for the specific screw specification for your model.
What is the difference between the TS7Z inner ring and outer ring?
The inner ring contacts the shaft bore directly and expands radially outward when the clamping screws are tightened. The outer ring contacts the hub bore and contracts radially inward. The tapered interface between the two rings converts axial screw preload into radial clamping force on both surfaces simultaneously.
What is the difference between TS7Z Ma_small and Ma_large values?
Some TS7Z models list two M_a values corresponding to different screw sizes within the assembly. The smaller screws (inner ring) and larger screws (outer ring) may have different specified tightening torques. Always tighten all screws of the same size to the same specified torque and verify with the product documentation for your specific model.
What is the operating principle of a locking assembly?
A locking assembly — also called a keyless shaft-hub connection or friction locking device — uses axial bolt preload to expand a split inner ring against the shaft surface and simultaneously contract a tapered outer ring against the hub bore. This generates a uniform radial clamping pressure that transmits torque through friction, eliminating the need for a keyway or interference fit.
What shaft surface finish is recommended for the TS7Z?
A shaft surface finish of Ra 0.8 to 1.6 μm (Rz 6.3 to 10 μm) and a tolerance of h6 or k6 are recommended. Coarser surface finishes reduce the effective friction area; finer finishes may reduce friction coefficient. The shaft surface must be clean and dry at installation — do not use lubricant on the shaft surface within the clamping zone.
Source the TS7Z45×85 Locking Assembly
Ever Power manufactures the TS7Z45×85 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.