Description
TS7Z85×130 Locking Assembly – 85mm Shaft 130mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z85×130 addresses 85 mm shaft connections with a rated torque of 3.69 kN·m and a high axial force capacity of 123 kN. Applications include large industrial fan impeller hubs, heavy-duty conveyor terminal drum connections, and industrial crusher shaft-hub interfaces where sustained high torque combined with shock loading defines the service condition. 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 TS7Z85×130 at the specified M_a of 84 N·m — generates a friction connection that transmits both torque (Mt = 3.69 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 | TS7Z85×130 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 85 mm |
| Outer Diameter (D) | 130 mm |
| Rated Axial Force (Ft) | 123 kN |
| Rated Torque (Mt) | 3.69 kN·m |
| Surface Pressure (Ps) | 62 MPa |
| Installation Screw Torque (Ma) | 84 N·m |
| Mass (G) | 5.5 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z85×130 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 (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
★★★★★
France — Food & Beverage Processing
Installed on conveyor drive shaft connections in our bottling plant. The TS7Z85×130 allowed installation by our maintenance team using only standard torque tools. The published surface pressure of 62 MPa was used to verify shaft suitability in our design review, which is not possible with conventional keyed connections.
— Applications Engineer, Lyon
★★★★★
Norway — Oil & Gas Field Equipment
We use the TS7Z85×130 for mud pump crankshaft to drive shaft connections at our drilling facility. The locking assembly’s keyless design eliminates the keyway stress riser from the crankshaft, which was a fatigue crack initiation concern at our previous scheduled inspection.
— Systems Engineer, Stavanger
★★★★☆
Argentina — Pump & Compressor OEM
Installed on compressor crankshaft to flywheel connections on our reciprocating gas compressors. The locking assembly’s keyless connection distributes torque through friction over the full bore surface rather than concentrating load at a key, which our fatigue analysis showed extended shaft service life by an estimated 40% under our operating cycle.
— Engineering Manager, Buenos Aires
Frequently Asked Questions
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.
What is the hub bore tolerance recommended for the TS7Z outer ring?
A hub bore tolerance of H7 is the standard recommendation. This provides a sliding clearance fit for the outer ring during installation, allowing the ring to be inserted and the clamping screws tightened without axial force. A tighter tolerance (H6) may be used if the hub bore machining permits, but should be confirmed against the specific TS7Z model’s outer diameter tolerance.
How does shaft diameter affect the rated torque of a locking assembly?
Rated torque Mt scales approximately with the cube of shaft diameter for a given surface pressure. This is why the TS7Z series shows a large increase in Mt from smaller models (0.126 kN·m for TS7Z15×45) to larger ones (7.20 kN·m for TS7Z110×160) — the shaft diameter increase drives a disproportionate increase in torque capacity at a similar or lower surface pressure.
Is the TS7Z suitable for very low-speed, high-torque applications?
Yes. Locking assemblies are particularly well suited to low-speed, high-torque applications such as crusher drives, mill drives, and mixer agitators — where the torque per unit of shaft diameter is high and keyway fatigue is a concern. The TS7Z’s frictional connection distributes load uniformly without the stress concentration of a keyway.
How do I calculate whether the TS7Z is suitable for my application?
Three checks are required: (1) Mt ≥ application torque × safety factor; (2) Ft ≥ application axial force × safety factor; (3) Ps ≤ 0.9 × shaft material yield strength. A recommended safety factor of 1.5 to 2.0 should be applied to rated values. Contact Ever Power’s engineering team for a free application check if you have any uncertainty.
Source the TS7Z85×130 Locking Assembly
Ever Power manufactures the TS7Z85×130 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.