Description
TS7Z65×105 Locking Assembly – 65mm Shaft 105mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z65×105 delivers a notable torque increase to 1.87 kN·m at the 65 mm bore size, addressing large industrial drives in the 400–800 kW range. Large centrifugal fan impeller hubs, industrial compressor rotor connections, and heavy-duty conveyor head drum drives at this shaft size are primary 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 — 53 MPa for the TS7Z65×105 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 1.87 kN·m) and axial force (Ft = 62.4 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 | TS7Z65×105 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 65 mm |
| Outer Diameter (D) | 105 mm |
| Rated Axial Force (Ft) | 62.4 kN |
| Rated Torque (Mt) | 1.87 kN·m |
| Surface Pressure (Ps) | 53 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 3.3 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z65×105 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 (53 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 53 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 53 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
★★★★★
India — Cement Plant Engineering
Installed in raw mill drive connections on our cement production line. The TS7Z65×105 handles the shock load and start-up torque of the mill drive without any fretting or slip across two years of continuous three-shift operation. The 3.3 kg mass is low enough that lifting equipment is not required for installation.
— Chief Engineer, Pune
★★★★★
Netherlands — Power Generation
Specified for turbine-to-generator shaft connections at our 18 MW power station. The locking assembly design eliminates the stress concentration of a keyway, which was a concern for our fatigue life calculations on the shaft. The 1.87 kN·m rated torque and the published installation procedure allowed us to commission the shaft connections to a traceable standard.
— Procurement Manager, Rotterdam
★★★★☆
Canada — Conveyor Systems Integrator
The TS7Z65×105 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
Frequently Asked Questions
What lubrication is required during TS7Z installation?
The clamping screw threads and screw head bearing faces should be lubricated with a molybdenum disulfide paste (such as Molykote G-n or equivalent) before installation. This ensures the specified M_a torque produces the correct bolt preload. Do not lubricate the shaft surface or hub bore contact surfaces within the clamping zone.
What is the recommended minimum hub length for the TS7Z?
Hub length should be at least equal to the locking assembly’s body length, and the hub bore should have a H7 tolerance for standard fit. The hub material should have a yield strength sufficient to withstand the Ps radial contact pressure from the outer ring without plastic deformation.
What is the hub bore tolerance recommended for the TS7Z outer ring?
A hub bore tolerance of H7 is the standard recommendation. This provides a sliding clearance fit for the outer ring during installation, allowing the ring to be inserted and the clamping screws tightened without axial force. A tighter tolerance (H6) may be used if the hub bore machining permits, but should be confirmed against the specific TS7Z model’s outer diameter tolerance.
How does shaft diameter affect the rated torque of a locking assembly?
Rated torque Mt scales approximately with the cube of shaft diameter for a given surface pressure. This is why the TS7Z series shows a large increase in Mt from smaller models (0.126 kN·m for TS7Z15×45) to larger ones (7.20 kN·m for TS7Z110×160) — the shaft diameter increase drives a disproportionate increase in torque capacity at a similar or lower surface pressure.
Is the TS7Z suitable for very low-speed, high-torque applications?
Yes. Locking assemblies are particularly well suited to low-speed, high-torque applications such as crusher drives, mill drives, and mixer agitators — where the torque per unit of shaft diameter is high and keyway fatigue is a concern. The TS7Z’s frictional connection distributes load uniformly without the stress concentration of a keyway.
Source the TS7Z65×105 Locking Assembly
Ever Power manufactures the TS7Z65×105 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.