{"id":3497,"date":"2026-07-08T05:16:07","date_gmt":"2026-07-08T05:16:07","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/ts7z38x75-locking-assembly-rigid-coupling-38mm-shaft-75mm-od-keyless-hub-connection\/"},"modified":"2026-07-08T05:16:12","modified_gmt":"2026-07-08T05:16:12","slug":"ts7z38x75-locking-assembly-rigid-coupling-38mm-shaft-75mm-od-keyless-hub-connection","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/fr\/product\/ts7z38x75-locking-assembly-rigid-coupling-38mm-shaft-75mm-od-keyless-hub-connection\/","title":{"rendered":"TS7Z38\u00d775 Locking Assembly Rigid Coupling \u2013 38mm Shaft 75mm OD Keyless Hub Connection"},"content":{"rendered":"
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TS7Z38\u00d775 Locking Assembly \u2013 38mm Shaft 75mm OD Keyless Rigid Shaft-Hub Connector<\/h1>\n

At 38 mm bore with the same 75 mm outer diameter as the TS7Z35\u00d775 and TS7Z40\u00d775, the TS7Z38\u00d775<\/strong> covers non-standard shaft sizes common in crane hoist gearboxes, older IEC motors with imperial-influenced shaft diameters, and customised drive systems. The 0.546 kN\u00b7m and 31.2 kN ratings with 42 N\u00b7m installation torque position it squarely in the medium industrial drive class. 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 73 MPa for the TS7Z38\u00d775 at the specified M_a of 42 N\u00b7m \u2014 generates a friction connection that transmits both torque (Mt = 0.546 kN\u00b7m) and axial force (Ft = 31.2 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>\nTS7Z38\u00d775<\/td>\n<\/tr>\n
Type<\/td>\nLocking Assembly (Keyless Shaft-Hub Connection)<\/td>\n<\/tr>\n
Shaft Bore (d)<\/td>\n38 mm<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n75 mm<\/td>\n<\/tr>\n
Rated Axial Force (Ft)<\/td>\n31.2 kN<\/td>\n<\/tr>\n
Rated Torque (Mt)<\/td>\n0.546 kN\u00b7m<\/td>\n<\/tr>\n
Surface Pressure (Ps)<\/td>\n73 MPa<\/td>\n<\/tr>\n
Installation Screw Torque (Ma)<\/td>\n42 N\u00b7m<\/td>\n<\/tr>\n
Mass (G)<\/td>\n1.2 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

\"TS7Z38\u00d775<\/p>\n

Structural Cross-Section<\/h2>\n

\"TS7Z38\u00d775<\/p>\n

Installation and Design Guidance<\/h2>\n

\"TS7Z38\u00d775<\/p>\n

Installation of the TS7Z38\u00d775 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 = 42 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 (73 MPa) \u2264 0.9 \u00d7 shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 \u00d7 370 = 333 MPa > 73 MPa \u2014 acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 \u00d7 275 = 247 MPa; compare with 73 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

Netherlands \u2014 Power Generation<\/p>\n

Specified for turbine-to-generator shaft connections at our 5 MW power station. The locking assembly design eliminates the stress concentration of a keyway, which was a concern for our fatigue life calculations on the shaft. The 0.546 kN\u00b7m rated torque and the published installation procedure allowed us to commission the shaft connections to a traceable standard.<\/p>\n

\u2014 Procurement Manager, Rotterdam<\/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 TS7Z38\u00d775 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

Spain \u2014 Hydraulic Press Manufacturing<\/p>\n

Installed on hydraulic press main drive shaft connections. The TS7Z38\u00d775 handles the peak torque of the pressing cycle without slip \u2014 the 31.2 kN axial capacity exceeds our press reaction force requirement. After 18 months of production we have not needed to re-tighten any of the locking assemblies.<\/p>\n

\u2014 Senior Engineer, Bilbao<\/p>\n<\/div>\n<\/div>\n

Frequently Asked Questions<\/h2>\n