{"id":3492,"date":"2026-07-08T05:15:41","date_gmt":"2026-07-08T05:15:41","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/ts7z25x55-locking-assembly-rigid-coupling-25mm-shaft-55mm-od-keyless-hub-connection\/"},"modified":"2026-07-08T05:15:49","modified_gmt":"2026-07-08T05:15:49","slug":"ts7z25x55-locking-assembly-rigid-coupling-25mm-shaft-55mm-od-keyless-hub-connection","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/fr\/product\/ts7z25x55-locking-assembly-rigid-coupling-25mm-shaft-55mm-od-keyless-hub-connection\/","title":{"rendered":"TS7Z25\u00d755 Locking Assembly Rigid Coupling \u2013 25mm Shaft 55mm OD Keyless Hub Connection"},"content":{"rendered":"
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TS7Z25\u00d755 Locking Assembly \u2013 25mm Shaft 55mm OD Keyless Rigid Shaft-Hub Connector<\/h1>\n

The TS7Z25\u00d755<\/strong> addresses the highly standardised 25 mm shaft size common in IEC frame 112 and 132 motors across global industrial applications. The 0.315 kN\u00b7m torque rating, 25.2 kN axial force capacity, and 91 MPa surface pressure at 17 N\u00b7m installation torque make this one of the most application-matched models in the TS7Z series for general industrial drive connections. 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 91 MPa for the TS7Z25\u00d755 at the specified M_a of 17 N\u00b7m \u2014 generates a friction connection that transmits both torque (Mt = 0.315 kN\u00b7m) and axial force (Ft = 25.2 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>\nTS7Z25\u00d755<\/td>\n<\/tr>\n
Type<\/td>\nLocking Assembly (Keyless Shaft-Hub Connection)<\/td>\n<\/tr>\n
Shaft Bore (d)<\/td>\n25 mm<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n55 mm<\/td>\n<\/tr>\n
Rated Axial Force (Ft)<\/td>\n25.2 kN<\/td>\n<\/tr>\n
Rated Torque (Mt)<\/td>\n0.315 kN\u00b7m<\/td>\n<\/tr>\n
Surface Pressure (Ps)<\/td>\n91 MPa<\/td>\n<\/tr>\n
Installation Screw Torque (Ma)<\/td>\n17 N\u00b7m<\/td>\n<\/tr>\n
Mass (G)<\/td>\n0.77 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

\"TS7Z25\u00d755<\/p>\n

Structural Cross-Section<\/h2>\n

\"TS7Z25\u00d755<\/p>\n

Installation and Design Guidance<\/h2>\n

\"TS7Z25\u00d755<\/p>\n

Installation of the TS7Z25\u00d755 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 = 17 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 (91 MPa) \u2264 0.9 \u00d7 shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 \u00d7 370 = 333 MPa > 91 MPa \u2014 acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 \u00d7 275 = 247 MPa; compare with 91 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

Malaysia \u2014 Mining & Mineral Processing<\/p>\n

We specify the TS7Z25\u00d755 for crusher drive shaft connections in our hard rock mining operations. The locking assembly’s published radial force capacity and the known surface pressure on the shaft allow us to design to a traceable standard rather than relying on empirical keyway sizing rules.<\/p>\n

\u2014 Engineering Director, Kuala Lumpur<\/p>\n<\/div>\n

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

Indonesia \u2014 Metallurgical Equipment<\/p>\n

Installed on billet rolling mill drive connections. The TS7Z25\u00d755 handles the peak torque during cobble-clearing operations \u2014 a significant shock load above normal rolling torque \u2014 without slip. The locking assembly’s frictional connection distributes this shock load evenly rather than transmitting it through a key contact point.<\/p>\n

\u2014 Applications Specialist, Jakarta<\/p>\n<\/div>\n

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

Thailand \u2014 Quarrying & Aggregates<\/p>\n

The TS7Z25\u00d755 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.<\/p>\n

\u2014 Design Engineer, Bangkok<\/p>\n<\/div>\n<\/div>\n

Frequently Asked Questions<\/h2>\n