Description
TS7Z35×75 Locking Assembly – 35mm Shaft 75mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z35×75 introduces a notable step in rated torque and axial capacity compared to smaller models, with M_a increasing to 42 N·m — indicating the larger screw size used in this frame. The 35 mm bore suits IEC frame 180 and 200 motors in the 15–30 kW class, and the 1.3 kg mass remains manageable for two-person installation without lifting equipment. 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 — 80 MPa for the TS7Z35×75 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 0.499 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 | TS7Z35×75 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 35 mm |
| Outer Diameter (D) | 75 mm |
| Rated Axial Force (Ft) | 31.2 kN |
| Rated Torque (Mt) | 0.499 kN·m |
| Surface Pressure (Ps) | 80 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 1.3 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z35×75 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 (80 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 80 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 80 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 TS7Z35×75 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 1.3 kg mass is low enough that lifting equipment is not required for installation.
— Chief Engineer, Pune
★★★★★
South Korea — Chemical Process Plant
Used in agitator drive shaft connections on our chemical reactor vessels. The TS7Z35×75 allows shaft removal for vessel maintenance without shaft modification — the locking assembly releases cleanly when the screws are backed off, unlike interference-fit hubs that require heating and pressing. The 31.2 kN axial load capacity covers our process torque requirements with margin.
— Senior Designer, Busan
★★★★☆
Turkey — Automotive Press Line
Installed in the main press ram drive connections on our automotive transfer press. The TS7Z35×75 handles the cyclic peak torque of the press drive reliably. After 24 months and over 2 million press cycles, we have not had a single locking assembly issue. The shaft surface condition after disassembly at our last scheduled maintenance was excellent.
— Applications Engineer, Ankara
Frequently Asked Questions
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.
Can the TS7Z be used in high-temperature environments?
The TS7Z is made from steel with standard industrial surface treatment. It can operate continuously up to approximately 120°C. For higher temperatures, consult Ever Power for material and lubrication guidance. Thermal cycling can affect preload if shaft and hub materials have different thermal expansion coefficients.
Is the TS7Z available in stainless steel?
The standard TS7Z locking assembly is manufactured in steel with a standard surface treatment for industrial environments. For corrosion-resistant requirements, contact Ever Power to discuss material alternatives or protective coating options for your specific application.
Does the TS7Z require periodic retightening?
In normal operating conditions with the correct installation torque applied, retightening is not required between scheduled maintenance intervals. However, installations subject to sustained vibration, thermal cycling, or repeated load reversal transients should have the clamping screw torque verified at the first scheduled maintenance after initial installation.
Source the TS7Z35×75 Locking Assembly
Ever Power manufactures the TS7Z35×75 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.