{"id":3477,"date":"2026-07-08T05:14:34","date_gmt":"2026-07-08T05:14:34","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/ts7c-20-clamp-type-rigid-coupling-aluminum-alloy-20mm-od-split-body-precision-shaft-connector\/"},"modified":"2026-07-08T05:14:43","modified_gmt":"2026-07-08T05:14:43","slug":"ts7c-20-clamp-type-rigid-coupling-aluminum-alloy-20mm-od-split-body-precision-shaft-connector","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/zh\/product\/ts7c-20-clamp-type-rigid-coupling-aluminum-alloy-20mm-od-split-body-precision-shaft-connector\/","title":{"rendered":"TS7C-20 Clamp Type Rigid Coupling \u2013 Aluminum Alloy 20mm OD Split-Body Precision Shaft Connector"},"content":{"rendered":"
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TS7C-20 Clamp Type Rigid Coupling \u2013 Aluminum Alloy 20mm OD Split-Body Precision Shaft Connector<\/h1>\n

The TS7C-20 clamp type rigid coupling<\/strong> is the 20 mm outer diameter model in the TS7C aluminum alloy clamp series, rated at 0.5 N\u00b7m nominal torque and 5,400 rpm maximum rotational speed. It accepts bore diameters of 6 and 8 mm \u2014 covering the most common stepper motor and BLDC motor shaft sizes in this torque bracket \u2014 and uses M3 clamp screws to compress the split body uniformly around each shaft end. At 14.5 g, it is a compact and lightweight coupling suited to benchtop automation, precision positioning stages, and encoder drive connections where the non-marring clamp mechanism is preferred over a setscrew connection.<\/p>\n

The split-body clamp architecture of the TS7C series represents a meaningful engineering choice compared to the TS7 setscrew series. The setscrew applies clamping force at a single contact point and is optimal where maximum rotational speed and simplest installation are the primary criteria. The clamp mechanism distributes force uniformly and is optimal where shaft surface protection, repositionability during commissioning, or use on hardened or precision-ground shafts makes point-contact setscrew gripping unsuitable or undesirable. Both series deliver zero-backlash rigid torque transmission \u2014 the torque ratings and bore ranges within each frame size are matched between TS7 and TS7C.<\/p>\n

The M3 clamp screws at this frame size represent an upgrade from the M2 screws used in the TS7C-16, providing more available clamping force for the higher rated torque of the 20 mm frame. The stainless steel equivalent, the STS7C-20<\/strong>, is listed alongside all TS7C models in our full catalog<\/a>.<\/p>\n

Technical Specifications<\/h2>\n
\n\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>\nTS7C-20<\/td>\n<\/tr>\n
Series<\/td>\nTS7C Clamp Type Rigid Coupling<\/td>\n<\/tr>\n
Body Material<\/td>\nAluminum Alloy<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n20 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n30 mm<\/td>\n<\/tr>\n
Hub Length (L1)<\/td>\n9 mm<\/td>\n<\/tr>\n
Available Bore Sizes<\/td>\n6, 8 mm<\/td>\n<\/tr>\n
Clamp Screw Thread<\/td>\nM3<\/td>\n<\/tr>\n
Rated Torque<\/td>\n0.5 N\u00b7m<\/td>\n<\/tr>\n
Maximum Torque<\/td>\n1 N\u00b7m<\/td>\n<\/tr>\n
Maximum Rotational Speed<\/td>\n5,400 rpm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n8.8 \u00d7 10\u207b\u2077 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n14.5 g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimension Drawing<\/h2>\n

\"TS7C-20<\/p>\n

Clamp Mechanism Detail<\/h2>\n

\"TS7C-20<\/p>\n

The clamp mechanism on the TS7C-20 consists of a precision longitudinal slot cut through the coupling body on each hub side, with an M3 socket head cap screw spanning the slot to draw the two faces together. When tightened, the slot closes and the bore contracts uniformly around the shaft, creating a distributed clamping contact around the full 360\u00b0 of shaft circumference. The installation procedure requires inserting each shaft to the correct axial depth \u2014 indicated by the hub length L1 of 9 mm \u2014 and tightening the clamp screws alternately in small increments to achieve even compression. This controlled tightening sequence is more involved than a single setscrew operation but results in a more mechanically consistent grip across the full bore contact area.<\/p>\n

Typical Applications<\/h2>\n
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  • Stepper motor to leadscrew connections<\/strong> in 3D printing and CNC routing where axial coupling position may need adjustment during commissioning<\/li>\n
  • BLDC motor shaft couplings<\/strong> in compact actuator designs where shaft surface marking from setscrews must be avoided<\/li>\n
  • Precision gantry and linear stage drives<\/strong> \u2014 Y and Z axis connections requiring non-marring coupling to protect precision ground shaft surfaces<\/li>\n
  • Rotary encoder connections to driven shafts<\/strong> where the encoder’s shaft surface warranty requires a clamp-type connection<\/li>\n
  • Compact robotic finger and gripper drive shafts<\/strong> \u2014 where torque reversal and repositionability during assembly are operational requirements<\/li>\n<\/ul>\n

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

    South Korea \u2014 Precision Automation OEM<\/p>\n

    We use the TS7C-20 in our precision linear gantry drives where the coupling must be removed and repositioned during axis calibration. The clamp mechanism allows this without marking our precision ground shaft surfaces. Zero-backlash performance has been consistent across 300+ units over two production cycles.<\/p>\n

    \u2014 Mechanical Engineer, Incheon<\/p>\n<\/div>\n

    \n

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

    Sweden \u2014 Robotics Research Institute<\/p>\n

    Specified for finger joint drives on a dexterous manipulation robot. The 6\/8 mm mixed bore connected our servo motor output to the finger shaft directly. The clamp allowed us to adjust the coupling’s axial position repeatedly during kinematic calibration without any shaft surface degradation.<\/p>\n

    \u2014 Research Engineer, Stockholm<\/p>\n<\/div>\n

    \n

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

    Italy \u2014 CNC Machine Tool Builder<\/p>\n

    Used on Z-axis encoder connections where our hardened ball screw shaft cannot accept setscrew contact. The TS7C-20 clamp is the correct solution \u2014 it grips without indentation. Dimensional accuracy was confirmed on arrival inspection and all units were within our 0.01 mm bore tolerance requirement.<\/p>\n

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

    Frequently Asked Questions<\/h2>\n