Description
TS7Z15×45 Locking Assembly – 15mm Shaft 45mm OD Keyless Rigid Shaft-Hub Connector
The smallest model in the TS7Z series, the TS7Z15×45 serves 15 mm shaft connections in compact gearboxes, small reduction drives, and instrumentation equipment where a keyless shaft-hub connection at the miniature end of the locking assembly range is required. Its 16.8 kN axial force capacity and 0.126 kN·m torque rating cover a broad range of low-power industrial drives, and the 0.4 kg mass makes handling and installation straightforward 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 — 127 MPa for the TS7Z15×45 at the specified M_a of 17 N·m — generates a friction connection that transmits both torque (Mt = 0.126 kN·m) and axial force (Ft = 16.8 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 | TS7Z15×45 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 15 mm |
| Outer Diameter (D) | 45 mm |
| Rated Axial Force (Ft) | 16.8 kN |
| Rated Torque (Mt) | 0.126 kN·m |
| Surface Pressure (Ps) | 127 MPa |
| Installation Screw Torque (Ma) | 17 N·m |
| Mass (G) | 0.4 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z15×45 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 = 17 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 (127 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 127 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 127 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
★★★★★
Germany — Wind Turbine Manufacturing
We specified the TS7Z15×45 for main drive shaft connections on our 1 MW wind turbine gearbox housings. The locking assembly design allows precise torque setting during installation and the published Ft and Mt values aligned exactly with our shaft end-force calculations. We have installed over 60 units across three turbine models with no field failures.
— Senior Engineer, Düsseldorf
★★★★★
Australia — Mining Equipment OEM
Our underground drill rigs use the TS7Z15×45 to connect motor shafts to planetary reduction drives. The 127 MPa surface pressure rating is well within our shaft material limits and the preload torque of 17 N·m is straightforward to apply with our torque multiplier tools. Shaft runout after assembly was within our acceptance limit of 0.02 mm.
— Project Engineer, Melbourne
★★★★☆
India — Cement Plant Engineering
Installed in raw mill drive connections on our cement production line. The TS7Z15×45 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 0.4 kg mass is low enough that lifting equipment is not required for installation.
— Chief Engineer, Pune
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.
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.
Does the TS7Z locking assembly require a keyway in the shaft?
No. This is a primary advantage of the locking assembly design. The shaft requires only a plain, ground cylindrical surface within the bore tolerance — no keyway machining is required. This eliminates the keyway stress concentration and simplifies shaft manufacturing.
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.
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.
Source the TS7Z15×45 Locking Assembly
Ever Power manufactures the TS7Z15×45 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.