Description
TS7Z55×95 Locking Assembly – 55mm Shaft 95mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z55×95 steps up to a 55 mm bore with a significant increase in rated torque to 1.17 kN·m, making it suitable for large IEC motor shaft ends (frame 315 and 355) and heavy gearbox output shaft connections in the 160–400 kW drive class. The 95 mm outer diameter provides the ring wall section needed for the increased clamping loads at this bore size. 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 — 62 MPa for the TS7Z55×95 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 1.17 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 | TS7Z55×95 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 55 mm |
| Outer Diameter (D) | 95 mm |
| Rated Axial Force (Ft) | 62.4 kN |
| Rated Torque (Mt) | 1.17 kN·m |
| Surface Pressure (Ps) | 62 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 2.4 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z55×95 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 (62 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 62 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 62 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
★★★★★
Malaysia — Mining & Mineral Processing
We specify the TS7Z55×95 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
★★★★★
Vietnam — Pulp & Paper Industry
Used in Yankee dryer drive connections in our tissue paper machine. The TS7Z55×95’s keyless connection eliminates the fretting fatigue issue we experienced with keyed connections under the high sustained torque and vibration loading of the Yankee drive.
— Project Manager, Ho Chi Minh City
★★★★☆
Egypt — Industrial Gearbox OEM
We use the TS7Z55×95 for output shaft connections on our range of industrial helical and bevel-helical gearboxes. The locking assembly is offered as a standard shaft termination option because it allows the gearbox to be mounted on a plain shaft without machining a keyway — simplifying customer installation.
— Senior Engineer, Cairo
Frequently Asked Questions
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.
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 is the Ps (surface pressure) parameter and how is it used?
Ps is the radial contact pressure between the inner ring and the shaft surface at the specified installation torque. It is used to verify that the shaft material’s yield strength is not exceeded. The design rule is: Ps must be less than 0.9 × yield strength of the shaft material. For mild steel shafts (yield ~250 MPa), Ps must be below 225 MPa.
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.
Source the TS7Z55×95 Locking Assembly
Ever Power manufactures the TS7Z55×95 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.