Description
TS7Z90×135 Locking Assembly – 90mm Shaft 135mm OD Keyless Rigid Shaft-Hub Connector
At 90 mm bore with a rated torque of 4.92 kN·m, the TS7Z90×135 covers large industrial drive connections where shaft stress concentration from keyways would significantly reduce fatigue life. The 73 MPa surface pressure and 84 N·m installation torque are consistent with the large-frame section of the TS7Z series. This model is commonly used in sugar mill, paper machine, and large pump applications. 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 — 73 MPa for the TS7Z90×135 at the specified M_a of 84 N·m — generates a friction connection that transmits both torque (Mt = 4.92 kN·m) and axial force (Ft = 123 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 | TS7Z90×135 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 90 mm |
| Outer Diameter (D) | 135 mm |
| Rated Axial Force (Ft) | 123 kN |
| Rated Torque (Mt) | 4.92 kN·m |
| Surface Pressure (Ps) | 73 MPa |
| Installation Screw Torque (Ma) | 84 N·m |
| Mass (G) | 7.0 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z90×135 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 = 84 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 (73 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 73 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 73 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
★★★★★
Mexico — Textile Machinery OEM
Specified for weaving machine main shaft connections. The TS7Z90×135 provides a vibration-resistant keyless connection that eliminates the micro-fretting wear we experienced with key-and-keyway connections under the high-cycle, low-amplitude vibration loading of our textile machinery.
— Technical Buyer, Monterrey
★★★★★
Portugal — Railway Maintenance Equipment
Installed on wheel set drive connections on our track geometry measurement vehicles. The TS7Z90×135 provides a precisely reproducible connection that can be disassembled and reassembled to the same torque standard at each wheelset overhaul. The published preload torque of 84 N·m is the key parameter for our maintenance procedure.
— Design Engineer, Porto
★★★★☆
Chile — Sugar Mill Engineering
The TS7Z90×135 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
Frequently Asked Questions
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.
Can the TS7Z accommodate shaft misalignment?
No. The TS7Z is a rigid locking assembly and does not accommodate angular, parallel, or axial misalignment. Shaft and hub bore must be accurately aligned before installation. Any misalignment will be transmitted as a bending moment to the shaft and hub, reducing fatigue life.
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.
Source the TS7Z90×135 Locking Assembly
Ever Power manufactures the TS7Z90×135 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.