Sakai
Sakai UA-C Series Precision Shaft Coupling
Manufacturer: Sakai Manufacturing Co., Ltd.
Model: UA-C Series
Features
- The high-rigidity body and double bolt clamp ensure suitability for high-precision, high-response control.
- Cross-shaped pins on the center block and metal in the hub arm absorb eccentricity and angular misalignment with minimal clearance, ensuring accurate rotation.
- The structure allows free sliding and rotation of pins and metal, reducing support reaction force and increasing torsional rigidity, improving control responsiveness in servo and pulse motor applications.
- The compensation type’s damping properties and high torsional rigidity reduce vibration transmission, offering effective vibration control.
- Minimal support reaction force makes installation easy.
Specifications
(Dimensions: mm)
| Model number | d | A | B | P | L | J | C | M |
|---|---|---|---|---|---|---|---|---|
| UA-15C | 3~5 | 15 | 16 | 4 | 18 | 6 | 3 | M2.5 |
| UA-20C | 4~8 | 20 | 22 | 7 | 20 | 7 | 3.5 | M3 |
| UA-25C | 4~10 | 25 | 27 | 10 | 27 | 9 | 4.5 | M4 |
| UA-30C | 5~14 | 30 | 32 | 10 | 30 | 9.5 | 4.7 | M4 |
| UA-35C | 7~16 | 35 | 37 | 13 | 35 | 11.5 | 5.7 | M5 |
| UA-40C | 8~20 | 40 | 42 | 15 | 40 | 12.5 | 6.2 | M5 |
| UA-45C | 8~22 | 45 | 47 | 16 | 45 | 14 | 7 | M6 |
| UA-55C | 10~25 | 55 | 58 | 17 | 58 | 19 | 9.9 | M8 |
| Model number | Allowable torque N・m | Maximum torque N・m | Allowable thrust load N | Allowable eccentricity mm | Allowable deviation angle ° | Maximum rotation speed r/min | Torsional rigidity N・m/rad | Moment of inertia kg・m² | Mass g |
|---|---|---|---|---|---|---|---|---|---|
| UA-15C | 0.25 | 0.5 | 30 | 0.2 | 1 | 6,000 | 0.29×10³ | 0.25×10⁻⁶ | 9 |
| UA-20C | 0.5 | 1 | 60 | 0.2 | 1 | 6,000 | 0.90×10³ | 0.90×10⁻⁶ | 17 |
| UA-25C | 1 | 2 | 80 | 0.2 | 1 | 6,000 | 2.00×10³ | 2.99×10⁻⁶ | 36 |
| UA-30C | 2 | 4 | 140 | 0.2 | 1 | 6,000 | 3.78×10³ | 6.74×10⁻⁶ | 57 |
| UA-35C | 3.5 | 7 | 180 | 0.2 | 1 | 6,000 | 6.34×10³ | 1.36×10⁻⁵ | 83 |
| UA-40C | 5 | 10 | 320 | 0.2 | 1 | 6,000 | 1.06×10⁴ | 2.66×10⁻⁵ | 123 |
| UA-45C | 10 | 20 | 500 | 0.2 | 1 | 6,000 | 1.70×10⁴ | 0.47×10⁻⁴ | 178 |
| UA-55C | 20 | 40 | 850 | 0.2 | 1 | 6,000 | 3.00×10⁴ | 1.35×10⁻⁴ | 353 |
Standard Shaft Hole Diameter: d
| Model number | d | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 6.35 | 7 | 8 | 9.525 | 10 | 11 | 12 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 22 | 24 | 25 | |
| UA-15C | ● | ○ | ○ | 🟤 | |||||||||||||||||
| UA-20C | ● | ● | ● | ● | 🟤 | ○ | |||||||||||||||
| UA-25C | 🟤 | ● | ● | ● | ● | ● | 🟤 | ○ | |||||||||||||
| UA-30C | 🟤 | ● | ● | ● | ● | ○ | ○ | ○ | ○ | ○ | |||||||||||
| UA-35C | 🟤 | ● | ● | ● | ● | ● | ○ | ○ | ○ | ||||||||||||
| UA-40C | ● | ● | ● | ● | ● | ● | ○ | ○ | ○ | 🟤 | ○ | ○ | |||||||||
| UA-45C | 🟤 | ● | ● | ● | ● | ● | ● | ○ | ○ | 🟤 | ○ | ○ | ○ | ||||||||
| UA-55C | ● | ● | ● | ● | ● | ● | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ||||||||
- UA-55C is a semi-standard product (delivery time confirmed).
- The allowable torque applies. The rotational speed is 1500 min⁻¹.
- The maximum torque transmits instantaneously startup and braking.
- The allowable thrust load refers to the static thrust load. The load torque is zero.
- Insert the shaft up to the J mark correctly. For through holes, ensure the shaft does not protrude beyond the J mark.
- The moment of inertia and mass indicate the maximum shaft hole diameter.
- The ● symbol denotes the shaft hole diameter that accommodates a key. The ◯ symbol denotes a non-through hole diameter.
- The recommended shaft tolerance is h6.
- 🟤symbol denotes a semi-standard diameter (delivery time confirmed).
- UA-15C h6 corresponds to a maximum shaft diameter of 17 mm.
