{"id":3489,"date":"2026-07-08T05:15:28","date_gmt":"2026-07-08T05:15:28","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/ts7z20x50-locking-assembly-rigid-coupling-20mm-shaft-50mm-od-keyless-hub-connection\/"},"modified":"2026-07-08T05:15:36","modified_gmt":"2026-07-08T05:15:36","slug":"ts7z20x50-locking-assembly-rigid-coupling-20mm-shaft-50mm-od-keyless-hub-connection","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/th\/product\/ts7z20x50-locking-assembly-rigid-coupling-20mm-shaft-50mm-od-keyless-hub-connection\/","title":{"rendered":"TS7Z20\u00d750 Locking Assembly Rigid Coupling \u2013 20mm Shaft 50mm OD Keyless Hub Connection"},"content":{"rendered":"
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TS7Z20\u00d750 Locking Assembly \u2013 20mm Shaft 50mm OD Keyless Rigid Shaft-Hub Connector<\/h1>\n

The TS7Z20\u00d750<\/strong> is one of the most commonly specified models in the TS7Z small-bore range, addressing the widely standardised 20 mm motor shaft size (IEC frames 90 and 100). The 0.168 kN\u00b7m rated torque covers a broad range of fractional to 1 kW industrial drives, and the 95 MPa surface pressure is well within the capability of standard C45 shaft steel. 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 95 MPa for the TS7Z20\u00d750 at the specified M_a of 17 N\u00b7m \u2014 generates a friction connection that transmits both torque (Mt = 0.168 kN\u00b7m) and axial force (Ft = 16.8 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>\nTS7Z20\u00d750<\/td>\n<\/tr>\n
Type<\/td>\nLocking Assembly (Keyless Shaft-Hub Connection)<\/td>\n<\/tr>\n
Shaft Bore (d)<\/td>\n20 mm<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n50 mm<\/td>\n<\/tr>\n
Rated Axial Force (Ft)<\/td>\n16.8 kN<\/td>\n<\/tr>\n
Rated Torque (Mt)<\/td>\n0.168 kN\u00b7m<\/td>\n<\/tr>\n
Surface Pressure (Ps)<\/td>\n95 MPa<\/td>\n<\/tr>\n
Installation Screw Torque (Ma)<\/td>\n17 N\u00b7m<\/td>\n<\/tr>\n
Mass (G)<\/td>\n0.5 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

\"TS7Z20\u00d750<\/p>\n

Structural Cross-Section<\/h2>\n

\"TS7Z20\u00d750<\/p>\n

Installation and Design Guidance<\/h2>\n

\"TS7Z20\u00d750<\/p>\n

Installation of the TS7Z20\u00d750 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 (95 MPa) \u2264 0.9 \u00d7 shaft yield strength. For C45 steel (yield ~370 MPa): 0.9 \u00d7 370 = 333 MPa > 95 MPa \u2014 acceptable. For aluminium alloy 6061-T6 (yield ~275 MPa): 0.9 \u00d7 275 = 247 MPa; compare with 95 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

Mexico \u2014 Textile Machinery OEM<\/p>\n

Specified for weaving machine main shaft connections. The TS7Z20\u00d750 provides a vibration-resistant keyless connection that eliminates the micro-fretting wear we experienced with key-and-keyway connections under the high-cycle, low-amplitude vibration loading of our textile machinery.<\/p>\n

\u2014 Technical Buyer, Monterrey<\/p>\n<\/div>\n

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

Japan \u2014 Printing Machine Manufacturing<\/p>\n

Used in web offset printing press ink roller drive connections. The locking assembly’s zero-backlash rigid connection is essential for print registration accuracy \u2014 any shaft play would appear directly as registration error in the printed product. The TS7Z20\u00d750 has maintained its position integrity through our planned maintenance disassembly cycles.<\/p>\n

\u2014 Engineering Lead, Osaka<\/p>\n<\/div>\n

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

Finland \u2014 Wood Processing Equipment<\/p>\n

The TS7Z20\u00d750 is installed on chipper disc drive shaft connections at our wood processing facility. The locking assembly handles the high-energy shock loads from disc chipping operations without slip. The 0.5 kg mass is manageable by our two-person maintenance team without lifting equipment.<\/p>\n

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

Frequently Asked Questions<\/h2>\n