Description
TS7Z95×140S Locking Assembly – 95mm Shaft 140mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z95×140S — the ‘S’ designation indicating a specific configuration within this bore class — delivers 5.22 kN·m rated torque at 68 MPa surface pressure for 95 mm shaft connections. Large gearbox output shafts, primary crusher drives, and heavy-duty industrial pump drives in the 1.5–3 MW power range are primary application areas. 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 — 68 MPa for the TS7Z95×140S at the specified M_a of 84 N·m — generates a friction connection that transmits both torque (Mt = 5.22 kN·m) and axial force (Ft = 123 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 | TS7Z95×140S |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 95 mm |
| Outer Diameter (D) | 140 mm |
| Rated Axial Force (Ft) | 123 kN |
| Rated Torque (Mt) | 5.22 kN·m |
| Surface Pressure (Ps) | 68 MPa |
| Installation Screw Torque (Ma) | 84 N·m |
| Mass (G) | 7.5 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z95×140S 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 = 84 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 (68 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 68 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 68 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
★★★★★
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 TS7Z95×140S has maintained its position integrity through our planned maintenance disassembly cycles.
— Engineering Lead, Osaka
★★★★★
Czech Republic — Crane & Hoist OEM
The TS7Z95×140S is our standard for crane hoist drum shaft connections. The locking assembly design provides a safe, keyless connection that does not require any modification to the drum shaft or hub bore — both can be reused when the locking assembly is replaced at its maintenance interval.
— Project Engineer, Brno
★★★★☆
Malaysia — Mining & Mineral Processing
We specify the TS7Z95×140S for crusher drive shaft connections in our hard rock mining operations. The locking assembly’s published radial force capacity and the known surface pressure on the shaft allow us to design to a traceable standard rather than relying on empirical keyway sizing rules.
— Engineering Director, Kuala Lumpur
Frequently Asked Questions
What is the maximum shaft diameter for the TS7Z series?
The TS7Z series covers shaft bore diameters from 15 mm (TS7Z15×45) to 110 mm (TS7Z110×160). If a shaft diameter outside this range is required, contact Ever Power to discuss alternative locking assembly series that may cover your requirement.
Is the TS7Z suitable for use in explosive atmospheres (ATEX)?
The TS7Z is a mechanical component and does not carry an ATEX electrical rating. The steel body has low spark risk from mechanical contact, and locking assemblies are commonly used in ATEX Zone 1 and Zone 2 machinery. Confirm the overall machine ATEX certification requirements with your safety engineer and Ex certification body.
What is the angular positioning accuracy of the TS7Z?
The TS7Z allows the hub to be positioned at any angular position relative to the shaft before tightening the clamping screws. Once tightened to M_a, the angular position is fixed. Repositioning requires loosening and retightening. For applications requiring angular adjustment, a position can be re-established to within the measurement resolution of your setup tooling.
Can the TS7Z be used with aluminium hubs?
Yes, provided the aluminium hub material has sufficient yield strength to withstand the Ps contact pressure from the outer ring. For common aluminium alloys (e.g. 6061-T6, yield ~275 MPa; 7075-T6, yield ~500 MPa), the Ps value for the selected TS7Z model must be below 0.9 × hub material yield strength.
How is the installation torque Ma applied to the TS7Z?
The M_a value is the tightening torque applied to each of the locking assembly’s clamping screws during installation. Tighten the screws progressively in a star pattern — not sequentially around the circumference — until all screws reach the specified M_a torque. This ensures even distribution of clamping force and symmetric shaft contact pressure.
Source the TS7Z95×140S Locking Assembly
Ever Power manufactures the TS7Z95×140S 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.