The square stack with center hole is composed of square perforated single-piece piezoelectric ceramic actuators, which are electrically connected in parallel and mechanically connected in series through external electrodes and copper foils. Compared with conventional square stacks, it has through-holes inside, which results in better thermal dissipation and facilitates the installation of various supporting components.

| 
 | PAB-D8-9W | PAB-D8-18W | PAB-D8-36W | PAB-D8-60W | Unit | Tolerance | 
| Active axes | Z | Z | Z | Z | 
 | 
 | 
| Max. displacement | 12 | 22.0 | 44.0 | 72.0 | μm | ±15% | 
| Displacement hysteresis | <15% | <15% | <15% | <15% | 
 | 
 | 
| Blocking force | 1800 | 1800 | 1800 | 1800 | N | 150V | 
| Operating voltage | 0~150 | 0~150 | 0~150 | 0~150 | V | 
 | 
| Resonant frequency | 130 | 100 | 38 | 22 | kHz | Max. value | 
| Resonant impedance | 66 | 70 | 76 | 86 | mΩ | 
 | 
| Anti - resonant frequency | 160 | 120 | 44 | 26 | kHz | Max. value | 
| Dielectric loss | 2.08 | 1.99 | 1.9 | 1.92 | 
 | 
 | 
| Electrical capacitance | 2.7 | 5.3 | 10.5 | 18 | nF | ±15% | 
| Operating temperature range | -25~130 | -25~130 | -25~130 | -25~130 | °C | 
 | 
| Curie temperature | 230°C | 230°C | 230°C | 230°C | °C | 
 | 
| Electrode | Silver | Silver | Silver | Silver | 
 | 
 | 
| Cable length | 75 | 75 | 75 | 75 | mm | ±5 mm | 
| Dimensions - Φ | 8.3 | 8.3 | 8.3 | 8.3 | mm | ±0.1 mm | 
| Dimensions - L | 9 | 18 | 36 | 60 | mm | ±0.05 mm | 
| MTTF | 16 | 14 | 9 | 
 | 
 | 
 | 
