{"id":3508,"date":"2026-07-08T05:16:59","date_gmt":"2026-07-08T05:16:59","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/ts7z80x125-locking-assembly-rigid-coupling-80mm-shaft-125mm-od-keyless-hub-connection\/"},"modified":"2026-07-08T05:17:01","modified_gmt":"2026-07-08T05:17:01","slug":"ts7z80x125-locking-assembly-rigid-coupling-80mm-shaft-125mm-od-keyless-hub-connection","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/ar\/product\/ts7z80x125-locking-assembly-rigid-coupling-80mm-shaft-125mm-od-keyless-hub-connection\/","title":{"rendered":"TS7Z80\u00d7125 Locking Assembly Rigid Coupling \u2013 80mm Shaft 125mm OD Keyless Hub Connection"},"content":{"rendered":"
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TS7Z80\u00d7125 Locking Assembly \u2013 80mm Shaft 125mm OD Keyless Rigid Shaft-Hub Connector<\/h1>\n

At 80 mm bore and 125 mm OD, the TS7Z80\u00d7125<\/strong> delivers a major step up in rated torque to 3.44 kN\u00b7m, with axial capacity reaching 98.4 kN. This model is specified for heavy mill drive connections, large pump and compressor shaft connections, and high-power gearbox output connections in the 1\u20132 MW power range where keyway fatigue at the shaft-hub interface is a recognised design risk. For a complete listing of all TS7Z locking assembly models, visit our product catalog<\/a>.<\/p>\n

The TS7Z locking assembly operates on the principle of tapered ring compression: two tapered steel rings \u2014 inner and outer \u2014 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 \u2014 66 MPa for the TS7Z80\u00d7125 at the specified M_a of 84 N\u00b7m \u2014 generates a friction connection that transmits both torque (Mt = 3.44 kN\u00b7m) and axial force (Ft = 98.4 kN) without any mechanical interlock element. No keyway is required in either the shaft or the hub bore.<\/p>\n

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 \u2014 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 \u2014 mills, fans, compressors, and crushers \u2014 this durability improvement is a primary selection rationale.<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nTS7Z80\u00d7125<\/td>\n<\/tr>\n
Type<\/td>\nLocking Assembly (Keyless Shaft-Hub Connection)<\/td>\n<\/tr>\n
Shaft Bore (d)<\/td>\n80 mm<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n125 mm<\/td>\n<\/tr>\n
Rated Axial Force (Ft)<\/td>\n98.4 kN<\/td>\n<\/tr>\n
Rated Torque (Mt)<\/td>\n3.44 kN\u00b7m<\/td>\n<\/tr>\n
Surface Pressure (Ps)<\/td>\n66 MPa<\/td>\n<\/tr>\n
Installation Screw Torque (Ma)<\/td>\n84 N\u00b7m<\/td>\n<\/tr>\n
Mass (G)<\/td>\n5.2 kg<\/td>\n<\/tr>\n
Material<\/td>\nSteel<\/td>\n<\/tr>\n
Standard<\/td>\nGB\/T 5106 compatible<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimensional Reference<\/h2>\n

\"TS7Z80\u00d7125<\/p>\n

Structural Cross-Section<\/h2>\n

\"TS7Z80\u00d7125<\/p>\n

Installation and Design Guidance<\/h2>\n

\"TS7Z80\u00d7125<\/p>\n

Installation of the TS7Z80\u00d7125 requires the shaft surface to be clean, dry, and within an h6 or k6 shaft tolerance, with a surface finish of Ra 0.8\u20131.6 \u03bcm. The hub bore should be machined to H7 tolerance. Clamping screw threads and head bearing faces must be lubricated with MoS\u2082 paste before installation to ensure the M_a = 84 N\u00b7m tightening torque produces the correct clamping force. Tighten all screws in a star pattern in at least three progressive passes \u2014 do not fully tighten one screw before the others.<\/p>\n

To verify shaft material suitability, check: Ps (66 MPa) \u2264 0.9 \u00d7 shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 \u00d7 370 = 333 MPa > 66 MPa \u2014 acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 \u00d7 275 = 247 MPa; compare with 66 MPa for this model. If the shaft material yield strength is insufficient, contact our contact our team<\/a> for a re-rated configuration.<\/p>\n

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Keyless Design<\/h3>\n

No keyway in shaft or hub. Eliminates keyway stress concentration and fretting wear. Angular position can be set freely \u2014 no keyway angular constraint.<\/p>\n<\/div>\n

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Self-Releasing Disassembly<\/h3>\n

Back off clamping screws in a star pattern \u2014 the taper geometry produces a self-releasing action requiring no extraction tools or heat. Shaft and hub surfaces are undamaged after removal.<\/p>\n<\/div>\n

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Uniform Load Distribution<\/h3>\n

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.<\/p>\n<\/div>\n

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Bidirectional Torque<\/h3>\n

Frictional connection transmits equal torque in both rotational directions. No directional constraint \u2014 suitable for reversing drive applications without additional design consideration.<\/p>\n<\/div>\n<\/div>\n

Customer Reviews and Case Studies<\/h2>\n
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\u2605\u2605\u2605\u2605\u2605<\/p>\n

South Korea \u2014 Chemical Process Plant<\/p>\n

Used in agitator drive shaft connections on our chemical reactor vessels. The TS7Z80\u00d7125 allows shaft removal for vessel maintenance without shaft modification \u2014 the locking assembly releases cleanly when the screws are backed off, unlike interference-fit hubs that require heating and pressing. The 98.4 kN axial load capacity covers our process torque requirements with margin.<\/p>\n

\u2014 Senior Designer, Busan<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/p>\n

South Africa \u2014 Plastics Extrusion OEM<\/p>\n

We use the TS7Z80\u00d7125 in extruder screw drive connections on our 200 mm diameter twin-screw extrusion lines. The locking assembly allows the extruder screw to be withdrawn axially without shaft damage during barrel cleaning, unlike keyed connections which require the hub to be split and remachined after each removal.<\/p>\n

\u2014 Maintenance Manager, Johannesburg<\/p>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2606<\/p>\n

Sweden \u2014 Rubber Processing Equipment<\/p>\n

We use the TS7Z80\u00d7125 for open mill roll drive connections. The locking assembly’s keyless design allows roll changes without machining a new keyway each time a replacement roll is fitted \u2014 a significant time saving in our maintenance workflow.<\/p>\n

\u2014 Project Manager, Gothenburg<\/p>\n<\/div>\n<\/div>\n

Frequently Asked Questions<\/h2>\n