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Technical Specifications
Last Updated: 2026-07-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | KDS-BL690 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
8.4V
108.34 oz-in
7.80 kg-cm
0.8 N-m
7.4V
90.29 oz-in
6.50 kg-cm
0.6 N-m
6.0V
76.40 oz-in
5.50 kg-cm
0.5 N-m
Below Average
|
| Speed |
8.4V
0.04 sec/60°
1,500.0 deg/s
250.0 RPM
7.4V
0.05 sec/60°
1,200.0 deg/s
200.0 RPM
6.0V
0.05 sec/60°
1,200.0 deg/s
200.0 RPM
Top 10%
|
| Physical | |
| Weight | 2.50 oz71.0 gBelow Average |
| Dimensions |
L 1.594 in W 0.787 in H 1.457 in L 40.5 mm W 20.0 mm H 37.0 mm |
| Case Material | Metal |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 1520 µs |
| Refresh Rate | 333 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Origin | |
| Country of Origin | China |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Torque | Below Average Stronger than 12% of 1043 Digital Standard servos at 6.0V |
| Speed | Top 10% Faster than 97% of 1041 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 30% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 2.83–5.01 W |
| Power Density | 2.740 W/in³ More power-dense than 55% of 1759 Digital Standard servos |
| Torque Density | 1.0761 oz-in/g Stronger than 5% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 41.80 oz-in/in³ Denser torque than 10% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.28169 (1/sec·g) Faster than 93% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 3.82 Better balanced than 5% of 1031 Digital Standard servos |
| Torque Gain per Volt | 17.42%/V More voltage-responsive (torque) than 66% of 850 Digital Standard servos |
| Speed Gain per Volt | 10.42%/V More voltage-responsive (speed) than 20% of 871 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 53% of 1539 Digital Standard servos |
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