The annular single-piece and stack actuators are fabricated by co-firing piezoceramic layers and internal electrodes. They are characterized by low drive voltage, large displacement, high driving force, fast response time, and high displacement accuracy. Compared to conventional square single-piece or stack actuators, the annular stack has superior heat dissipation capabilities, and the central through-hole can accommodate various support structures.

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 | PAB-R38-9W | PAB-R38-18W | PAB-R38-20W | PAB-R38-36W | PAB-R38-60W | Unit | Tolerance | 
| Active axes | Z | Z | Z | Z | Z | 
 | 
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| Max. displacement | 10.8 | 21.0 | 25.0 | 44.0 | 75.0 | μm | ±15% | 
| Displacement hysteresis | <15% | <15% | <15% | <15% | <15% | 
 | 
 | 
| Blocking force | 1600 | 1600 | 1600 | 1600 | 1600 | N | 150V | 
| Operating voltage | 0~150 | 0~150 | 0~150 | 0~150 | 0~150 | V | 
 | 
| Resonant frequency | 130 | 100 | 70 | 38 | 22 | kHz | Max. value | 
| Resonant impedance | 66 | 70 | 72 | 76 | 86 | mΩ | 
 | 
| Anti - resonant frequency | 160 | 120 | 82 | 44 | 26 | kHz | Max. value | 
| Dielectric loss | 2.08 | 1.99 | 1.98 | 1.9 | 1.92 | 
 | 
 | 
| Electrical capacitance | 2.1 | 5 | 7 | 10 | 17 | nF | ±15% | 
| Operating temperature range | -25~130 | -25~130 | -25~130 | -25~130 | -25~130 | °C | 
 | 
| Curie temperature | 230°C | 230°C | 230°C | 230°C | 230°C | °C | 
 | 
| Electrode | Silver | Silver | Silver | Silver | Silver | 
 | 
 | 
| Cable length | 75 | 75 | 75 | 75 | 75 | mm | ±5 mm | 
| Dimensions - Φ | 8.3 | 8.3 | 8.3 | 8.3 | 8.3 | mm | ±0.1 mm | 
| Dimensions - Φ | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | mm | ±0.1 mm | 
| Dimensions - L | 9 | 18 | 20 | 36 | 60 | mm | ±0.05 mm | 
| MTTF | 16 | 14 | 14 | 9 | 8 | year | 
 | 
