Description
TS7C-25 Clamp Type Rigid Coupling – Aluminum Alloy 25mm OD Mid-Range Precision Shaft Connector
The TS7C-25 clamp type rigid coupling is the 25 mm outer diameter aluminum alloy model in the TS7C series, delivering 1 N·m rated torque at up to 4,000 rpm through a split-body clamp mechanism. With a bore range of 8 and 10 mm and an overall length of 34 mm, this coupling targets the mid-range of the precision miniature coupling market — applications where the torque and bore requirements exceed the capability of the TS7C-16 and TS7C-20 but the non-marring shaft connection advantage of the clamp mechanism remains a design priority.
The clamp design at the 25 mm frame size uses M3 socket head cap screws to close the split body and compress the bore uniformly around each shaft. The 10 mm hub length per side provides adequate shaft engagement for the 1 N·m torque rating, distributing clamp force over a longer shaft contact zone than the smaller frame sizes. The 4,000 rpm maximum speed, while lower than setscrew equivalents, covers the vast majority of servo and stepper motor operating conditions in this torque class — particularly gearhead output connections, where motor-side speed is reduced and the output shaft operates at lower RPM.
The TS7C-25 is specified in applications where precision ground or hardened shafts must not be marked, where the coupling will be removed during product assembly or maintenance, or where encoder manufacturer requirements mandate a clamp-type connection. The stainless equivalent STS7C-25 is available for corrosion-exposed installations. Full series documentation is on our product page.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | TS7C-25 |
| Series | TS7C Clamp Type Rigid Coupling |
| Body Material | Aluminum Alloy |
| Outer Diameter (D) | 25 mm |
| Overall Length (L) | 34 mm |
| Hub Length (L1) | 10 mm |
| Available Bore Sizes | 8, 10 mm |
| Clamp Screw Thread | M3 |
| Rated Torque | 1 N·m |
| Maximum Torque | 2 N·m |
| Maximum Rotational Speed | 4,000 rpm |
| Moment of Inertia | 2.7 × 10⁻⁶ kg·m² |
| Mass | 2.8 g |
Note: The published mass of 2.8 g appears to be a documentation value for a specific configuration; verify against actual production units.
Dimension Drawing
Advantages of the Clamp Connection at the 25 mm Frame Size
At the 25 mm frame size, the TS7C-25 clamp design excels in applications where the shaft surfaces being connected are precision ground or hardened. Ball screw end shafts, servo motor output shafts with precision h5 tolerances, and encoder input shafts with ground surfaces are all components where a setscrew’s point-contact clamping would cause visible indentation over repeated removal-installation cycles. The TS7C-25’s distributed bore compression eliminates this issue while delivering identical zero-backlash rigid torque transmission.
The 10 mm hub length — longer than either the 6 mm (TS7C-16) or 9 mm (TS7C-20) hubs — distributes the 1 N·m clamping load over a larger shaft contact zone, improving the coupling’s tolerance to any minor bore-to-shaft tolerance variation that might reduce effective contact in smaller frame couplings.
Typical Applications
- Servo motor to gearhead output coupling on compact actuator systems where 8–10 mm shaft sizes and 1 N·m torque are typical
- Precision ground ball screw shaft connections — non-marring clamp preserves ground shaft surface for encoder or linear scale feedback systems
- Rotary table and indexer drive couplings — where coupling removal is part of the assembly and calibration procedure
- Semiconductor wafer handling robot axis drives — cleanroom precision motion stages where shaft surface condition is critical
- Optics and photonics alignment stage drives — where fine position adjustment during commissioning requires repositionable coupling
Customer Reviews and Case Studies
★★★★★
Taiwan — Semiconductor Equipment
We use the TS7C-25 on wafer handling robot axis drives. The precision ground shaft surfaces on our servo motor cannot accept setscrew contact — the clamp coupling was the only acceptable solution. The 8/10 mm bore matched our motor and actuator shafts, and zero-backlash performance has been consistent across our production fleet.
— Design Engineer, Hsinchu
★★★★★
France — Photonics Equipment OEM
Specified for optical alignment stage drives in a laser beam steering system. We needed to reposition the coupling multiple times during initial optical alignment commissioning. The TS7C-25 allowed repeated removal and reinstallation without marking the motor shaft, which was critical for our encoder feedback calibration process.
— Opto-Mechanical Engineer, Grenoble
★★★★☆
Canada — Industrial Automation Integrator
Used in a precision rotary indexer drive where the coupling must be removed during routine calibration cycles. The 10 mm bore option connected our servo gearhead output directly. The clamp mechanism has maintained its grip reliably across repeated removal-reinstall cycles over 8 months of production.
— Systems Engineer, Toronto
Frequently Asked Questions
What is the bore range of the TS7C-25?
The TS7C-25 accepts bore diameters of 8 and 10 mm on each side. Both equal-bore (8/8 or 10/10) and mixed-bore (8/10) configurations are available.
Why does the TS7C-25 have a lower maximum speed than the TS7-25?
The split-body clamp design introduces a small mass imbalance relative to the solid-body setscrew coupling, reducing the balanced rotational speed. The TS7C-25 is rated to 4,000 rpm versus 14,000 rpm for the TS7-25. For most servo and stepper motor applications where this coupling is specified, the operating speed is well within the 4,000 rpm limit.
Is the TS7C-25 suitable for direct servo motor output shaft coupling?
Yes. At 1 N·m rated torque and 4,000 rpm maximum speed, the TS7C-25 covers the operating range of most servo motors in the 100–400 W bracket when operating at or below 4,000 rpm. For higher speed servo connections, the TS7-25 setscrew model or a TS7C-32 may be more appropriate.
Can the TS7C-25 handle axial shaft movement during operation?
No. As a rigid coupling, the TS7C-25 does not accommodate any shaft movement — axial, angular, or parallel — during operation. Both shafts must be aligned and fixed before the coupling is tightened.
What is the recommended installation sequence for the TS7C-25?
Insert both shafts to the hub length depth (10 mm per side). Alternately tighten the M3 clamp screws on each side in small increments, checking alignment between increments, until the specified tightening torque is reached. Do not fully tighten one side before starting the other, as this can cause uneven bore compression.
Request Pricing for the TS7C-25
Ever Power manufactures the TS7C-25 and the full TS7C clamp series in-house. Submit bore sizes, quantity, and application details for a technical and commercial response from our engineering team.
