Description
TS7-32 Setscrew Rigid Coupling – 32 mm OD Heavy-Duty Precision Aluminum Alloy Coupler
The TS7-32 setscrew type rigid coupling is the largest of the four standard aluminum alloy frames in the TS7 series aside from the TS7-40, rated at 2 N·m nominal torque and 10,000 rpm maximum speed. With a 32 mm outer diameter and bore range of 12, 14, 15, and 16 mm, this coupling connects medium-frame servo motors, compact gearbox output shafts, and leadscrew assemblies in industrial automation, packaging machinery, and multi-axis CNC systems. The M4 setscrew thread is retained at this frame size, tightened to 1.7 N·m — the same as the TS7-25 — with the increased body mass and wall thickness at 32 mm OD providing additional mechanical support for the higher torque load.
At 71 g total mass and 9.1 × 10⁻⁶ kg·m² rotational inertia (calculated at maximum 16 mm bore), the TS7-32 remains lightweight relative to its torque capacity. In servo axis inertia ratio calculations, this figure should be reflected into the motor shaft and compared against the motor rotor inertia to confirm adequate servo loop stability. For most medium-frame servo motors in the 200–750 W range, the TS7-32 coupling inertia is negligible relative to the load-side inertia.
The stainless steel equivalent STS7-32 delivers the same performance envelope at 190 g in 316 stainless steel construction. The complete dimensional and parametric comparison between all TS7 frame sizes is available on our product listings page.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | TS7-32 |
| Body Material | Aluminum Alloy |
| Outer Diameter (D) | 32 mm |
| Overall Length (L) | 41 mm |
| Hub Length (L1) | 10 mm |
| Available Bore Sizes | 12, 14, 15, 16 mm |
| Setscrew Thread | M4 |
| Wrench Torque | 1.7 N·m |
| Rated Torque | 2 N·m |
| Maximum Torque | 4 N·m |
| Maximum Rotational Speed | 10,000 rpm |
| Moment of Inertia | 9.1 × 10⁻⁶ kg·m² |
| Mass | 71 g |
Dimension Drawing
Design Rationale
The TS7-32 is the natural progression from the TS7-25 for applications requiring the 12–16 mm bore range without stepping up to the TS7-40 frame. The 10 mm hub length per side — increased from 9 mm on the TS7-25 — extends shaft engagement to support the higher torque capacity reliably. The 32 mm OD maintains compatibility with the vast majority of servo motor end-bell pilot diameters in this torque class, making motor-mounted encoder couplings a common installation scenario.
One characteristic of the setscrew locking mechanism at larger shaft diameters is that the contact area between setscrew tip and shaft is a relatively small fraction of the shaft circumference. For applications with sustained reversal torques approaching the rated 2 N·m, the use of a shaft with a machined flat — aligned with the setscrew contact point — is strongly recommended to improve slip resistance and protect the shaft surface from point deformation.
Typical Applications
- Medium servo motor to ball screw coupling on industrial CNC machining centres and grinding machines
- Gearbox output to encoder feedback shaft in closed-loop drive systems for packaging conveyors
- Rotary actuator output shaft connections in industrial robot joint drives
- Precision indexing table drives in assembly automation and quality inspection systems
- Medical imaging equipment positioning axes — CT scan gantry, MRI table drive shafts
Customer Reviews and Case Studies
★★★★★
Germany — Industrial Packaging Machine Builder
We use the TS7-32 to couple medium servo motors to the encoder shafts on our case erecting machine drives. The coupling has to handle frequent direction reversals at up to 1.8 N·m — well within its rated capacity. After 18 months of production, none of the installed units have required replacement or re-tightening.
— Project Manager, Hamburg
★★★★★
United States — CNC Machine Tool Rebuilder
We retrofit older VMC spindles with new servo encoder feedback systems and the TS7-32 has become our standard coupling choice for the 15–16 mm encoder shaft connection. The zero-backlash performance is consistent and the dimensions are accurate — no fitment surprises on installation.
— Technical Director, Ohio
★★★★☆
Italy — Robot Integrator
Used in joint 3 and joint 5 of a 6-axis SCARA robot arm rebuild project. The TS7-32 handled the torque and speed requirements and the lightweight aluminum body kept the arm’s inertia figures within our dynamics model. The 14 mm and 16 mm bore options matched our motor and gearhead shafts without modification.
— Systems Engineer, Turin
Frequently Asked Questions
What bore sizes does the TS7-32 support?
The TS7-32 accepts bore diameters of 12, 14, 15, and 16 mm on each side independently. Mixed-bore configurations — for example 14 mm on the motor side and 16 mm on the gearbox output side — are available at standard pricing. Specify your d1 and d2 values when enquiring.
Should I request a shaft flat for use with the TS7-32?
For sustained torque duty or frequent reversals close to the rated 2 N·m, a machined flat on the shaft aligned with the setscrew contact point is strongly recommended. The flat prevents shaft rotation within the bore under reversing torque and protects the shaft surface. For light-duty or low-cycle applications, a standard round shaft with a h6 tolerance is acceptable.
How does the TS7-32 compare to the TS7-25?
The TS7-32 doubles the nominal torque capacity (2 N·m vs 1 N·m) and extends the bore range from 8–12 mm to 12–16 mm. Maximum speed reduces from 14,000 to 10,000 rpm. Choose the TS7-32 when your shaft diameter exceeds 12 mm or your torque requirement exceeds 1 N·m.
Is a stainless steel version of the TS7-32 available?
Yes. The STS7-32 is manufactured from 316 stainless steel with identical dimensions and performance ratings to the TS7-32 aluminum version. The stainless variant weighs 190 g versus 71 g for aluminum. It is the correct choice for food processing, pharmaceutical, washdown, and corrosive environments.
Can the TS7-32 handle bidirectional torque?
Yes. The rigid one-piece body transmits torque identically in both rotational directions. For applications with frequent torque reversals at or near the rated 2 N·m, a shaft flat is recommended along with a thread-locking compound on the setscrews to prevent vibration loosening between maintenance intervals.
Get a Quote for the TS7-32 Rigid Coupling
Ever Power manufactures the TS7-32 and the full TS7 setscrew series in-house. Share your bore sizes, quantity, and application — our team will respond with technical confirmation and factory-direct pricing.
