Description
TS7Z17×45 Locking Assembly – 17mm Shaft 45mm OD Keyless Rigid Shaft-Hub Connector
At 17 mm bore with a 45 mm outer diameter, the TS7Z17×45 fills the gap between 16 mm and 18 mm shaft sizes common in European motor standards. The 0.142 kN·m torque rating matches compact servo-driven conveyor and positioning drives, and the identical outer diameter to the TS7Z15×45 and TS7Z16×45 allows hub designs to be standardised across this three-bore range. 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 — 112 MPa for the TS7Z17×45 at the specified M_a of 17 N·m — generates a friction connection that transmits both torque (Mt = 0.142 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 | TS7Z17×45 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 17 mm |
| Outer Diameter (D) | 45 mm |
| Rated Axial Force (Ft) | 16.8 kN |
| Rated Torque (Mt) | 0.142 kN·m |
| Surface Pressure (Ps) | 112 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 TS7Z17×45 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 (112 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 112 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 112 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
★★★★★
Netherlands — Power Generation
Specified for turbine-to-generator shaft connections at our 1 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 0.142 kN·m rated torque and the published installation procedure allowed us to commission the shaft connections to a traceable standard.
— Procurement Manager, Rotterdam
★★★★★
Poland — Shipbuilding & Marine
We use the TS7Z17×45 for propeller shaft to reduction gearbox connections on our patrol vessels. The taper-free locking assembly design simplifies shaft removal during dry-dock maintenance compared to previous tapered hub arrangements. The 17 N·m installation torque is easily achieved with standard marine tools.
— Design Engineer, Warsaw
★★★★☆
Turkey — Automotive Press Line
Installed in the main press ram drive connections on our automotive transfer press. The TS7Z17×45 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
How does the TS7Z locking assembly compare to a keyed connection?
A locking assembly distributes torque and axial force uniformly around the shaft circumference through friction, eliminating the stress concentration of a keyway. This typically allows the same torque to be transmitted through a smaller shaft diameter, or significantly extends fatigue life at the same shaft size. Locking assemblies also allow precise angular positioning, which is not possible with a keyed connection unless the keyway is machined to a specific angular reference.
What is the Ft (axial force) capacity of the TS7Z?
Ft is the maximum axial force the locking assembly can resist at the specified installation torque. In most applications, the combined torque and axial force loading must be checked against the rated values — if both torque and axial force act simultaneously, the effective capacity of each is reduced proportionally. Consult the interaction formula provided in the product documentation.
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.
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.
Can the TS7Z be installed and removed without special tools?
Installation requires only a calibrated torque wrench with the correct hex key bit for the clamping screws. Removal is performed by loosening the clamping screws in a star pattern — the tapered ring geometry produces a self-releasing action as the screws are backed off. No hydraulic or heating tools are required for standard installations.
Source the TS7Z17×45 Locking Assembly
Ever Power manufactures the TS7Z17×45 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.