Description
TS7Z105×155 Locking Assembly – 105mm Shaft 155mm OD Keyless Rigid Shaft-Hub Connector
The TS7Z105×155 addresses 105 mm shaft connections with 5.84 kN·m rated torque and 144 kN axial capacity. The 57 MPa surface pressure at M_a = 145 N·m installation torque makes this model suitable for the largest continuously driven industrial machinery — cement raw mill drives, large agitator drives, and major paper machine calendar roll 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 — 57 MPa for the TS7Z105×155 at the specified M_a of 145 N·m — generates a friction connection that transmits both torque (Mt = 5.84 kN·m) and axial force (Ft = 144 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 | TS7Z105×155 |
| Type | Locking Assembly (Keyless Shaft-Hub Connection) |
| Shaft Bore (d) | 105 mm |
| Outer Diameter (D) | 155 mm |
| Rated Axial Force (Ft) | 144 kN |
| Rated Torque (Mt) | 5.84 kN·m |
| Surface Pressure (Ps) | 57 MPa |
| Installation Screw Torque (Ma) | 145 N·m |
| Mass (G) | 7.9 kg |
| Material | Steel |
| Standard | GB/T 5106 compatible |
Dimensional Reference
Structural Cross-Section
Installation and Design Guidance
Installation of the TS7Z105×155 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 = 145 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 (57 MPa) ≤ 0.9 × shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 × 370 = 333 MPa > 57 MPa — acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 × 275 = 247 MPa; compare with 57 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
★★★★★
Thailand — Quarrying & Aggregates
The TS7Z105×155 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
★★★★★
United Arab Emirates — Thermal Power Station
Installed on steam turbine auxiliary drive shaft connections at our 58 MW coal-fired power station. The locking assembly’s zero-keyway design was selected based on our shaft fatigue analysis — eliminating the keyway stress concentration extended the calculated fatigue life from 80,000 to over 200,000 operating hours.
— Technical Manager, Dubai
★★★★☆
Nigeria — Concrete Mixing Equipment
The TS7Z105×155 is installed in concrete mixer drum drive connections on our truck-mounted transit mixers. The locking assembly handles the variable torque loading of drum rotation during mixing and discharge cycles without slip. Removal at drum maintenance intervals is straightforward with the torque-wrench release procedure.
— Technical Buyer, Lagos
Frequently Asked Questions
How is the installation torque Ma applied to the TS7Z?
The M_a value is the tightening torque applied to each of the locking assembly’s clamping screws during installation. Tighten the screws progressively in a star pattern — not sequentially around the circumference — until all screws reach the specified M_a torque. This ensures even distribution of clamping force and symmetric shaft contact pressure.
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.
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.
Does the TS7Z require periodic retightening?
In normal operating conditions with the correct installation torque applied, retightening is not required between scheduled maintenance intervals. However, installations subject to sustained vibration, thermal cycling, or repeated load reversal transients should have the clamping screw torque verified at the first scheduled maintenance after initial installation.
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.
Source the TS7Z105×155 Locking Assembly
Ever Power manufactures the TS7Z105×155 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.