Description
TS7Z50×90 Locking Assembly – 50mm Shaft 90mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z50×90 serves the 50 mm shaft size — one of the most standardised large shaft diameters in IEC frame 280 and 315 motor design — with a 1.123 kN·m rated torque and 46.8 kN axial capacity. This model is widely specified for direct motor-to-driven equipment hub connections in the 90–200 kW industrial drive range, covering sectors from paper mills to steel rolling and chemical process drives. 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 — 65 MPa for the TS7Z50×90 at the specified M_a of 42 N·m — generates a friction connection that transmits both torque (Mt = 1.123 kN·m) and axial force (Ft = 46.8 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 | TS7Z50×90 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 50 mm |
| Outer Diameter (D) | 90 mm |
| Rated Axial Force (Ft) | 46.8 kN |
| Rated Torque (Mt) | 1.123 kN·m |
| Surface Pressure (Ps) | 65 MPa |
| Installation Screw Torque (Ma) | 42 N·m |
| Mass (G) | 2.5 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z50×90 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 (65 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 65 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 65 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
★★★★★
Czech Republic — Crane & Hoist OEM
The TS7Z50×90 is our standard for crane hoist drum shaft connections. The locking assembly design provides a safe, keyless connection that does not require any modification to the drum shaft or hub bore — both can be reused when the locking assembly is replaced at its maintenance interval.
— Project Engineer, Brno
★★★★★
Chile — Sugar Mill Engineering
The TS7Z50×90 is used in cane crusher roll drive connections at our sugar milling facility. The locking assembly handles the high sustained torque and occasional shock loading of cane crushing without slip or fretting. The keyless design allows roll removal during the crushing season’s maintenance shutdowns without shaft re-machining.
— Senior Engineer, Santiago
★★★★☆
Thailand — Quarrying & Aggregates
The TS7Z50×90 is used in primary jaw crusher drive connections at our quarry. The cyclic shock loading of jaw crushing operations is handled by the locking assembly’s high preload friction without any evidence of progressive slip or position change over our 12-month inspection interval.
— Design Engineer, Bangkok
Frequently Asked Questions
Can the TS7Z be used with hollow shafts?
Yes, provided the hollow shaft wall thickness is sufficient to withstand the Ps radial contact pressure without collapse. For hollow shaft applications, calculate the wall stress using the thick-walled cylinder formula with the inner pressure equal to Ps and the relevant wall geometry. Contact Ever Power if you require assistance with the hollow shaft calculation.
What surface treatment is applied to the TS7Z?
The standard TS7Z locking assembly components are manufactured from steel with a phosphate or similar surface treatment that provides moderate corrosion protection during storage and in dry industrial environments. For outdoor or wet environments, additional protection such as periodic light oiling of external surfaces is recommended.
Are dimensional drawings available for all TS7Z models?
Yes. Dimensional drawings in PDF and DXF format are available for all 31 TS7Z models on request. Contact Ever Power with your model number for drawing provision. CAD models in STEP format can also be provided for most sizes.
Can a locking assembly be reused after disassembly?
Yes. TS7Z locking assemblies can be disassembled and reused, provided the shaft and hub bore surfaces are inspected and show no scoring, corrosion, or fretting damage. Clean and lubricate the tapered contact surfaces before reassembly and retighten to the specified M_a torque.
Is the TS7Z suitable for reversing torque applications?
Yes. The locking assembly transmits torque equally in both rotational directions through friction — direction of rotation does not affect the connection. For applications with torque reversal, the safety factor on the rated torque should account for any dynamic amplification of the reversal shock.
Source the TS7Z50×90 Locking Assembly
Ever Power manufactures the TS7Z50×90 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.