The metal gear D-645MW is part of Hitec’s D-Series dynamo servo line. All Hitec D-Series servos have been designed using their cutting edge, custom engineering. Combining industry leading high-resolution, state-of-the-art ultra-response technology with a 32-bit MCU, and a 12-bit ADC for unprecedented programmability and flexibility. These servos deliver significantly smoother movement. The speedy, powerful line operates on a wide 4.8 ~ 8.4 voltage range, allowing use with any common battery chemistry without the need for adapters or regulators. Featuring Hitec’s industry standard 25-tooth output spline with an M3 pan head with a phillips drive style, each D-Series servo brings monster performance never known before in the market.

| Dimensions | 1.59” x 0.77” x 1.48” (40.6 x 19.8 x 37.8mm) |
|---|---|
| Product Weight | 2.11oz (60g) |
| Output Shaft Style | 25 tooth (H25T) spline |
| Voltage Range | 4.8V - 8.4V |
| No-Load Speed (4.8V) | 0.28 sec/60° |
| No-Load Speed (6.0V) | 0.20 sec/60° |
| No-Load Speed (7.4V) | 0.17 sec/60° |
| Stall Torque (4.8V) | 115.3 oz/in. (8.3 kg.cm) |
| Stall Torque (6.0V) | 157.8 oz/in. (11.3 kg.cm) |
| Stall Torque (7.4V) | 180.1 oz/in. (12.9 kg.cm) |
| Max PWM Signal Range (Standard) | 750-2250μsec |
| Travel per µs (out of box) | .080°/μsec |
| Max Travel (out of box) | 120° |
| Pulse Amplitude | 3-5V |
| Operating Temperature | -20°C to +60°C |
| Continuous Rotation Modifiable | Yes |
| Direction w/ Increasing PWM Signal | Clockwise |
| Deadband Width | 2µs |
| Motor Type | 3 Pole Ferrite |
| Feedback Style | 5KΩ Potentiometer |
| Output Shaft Support | Dual Ball Bearings |
| Gear Type | Straight Cut Spur |
| Gear Material | Metal |
| Wire Length | 11.81" (300mm) |
