Feetech SM40BL

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Technical Specifications

Last Updated: 2026-10-22

Identity
Brand
Product Number	SM-40BL-C001
Category	Hobby
Performance
Torque	12.0V 555.60 oz-in 6.0V 44.45 oz-in
Speed	12.0V0.15 sec/60°
Stall Current	1.5–2.5 AAverage
Physical
Weight	3.53 ozBelow Average
Dimensions	L 1.831 in W 1.122 in H 1.339 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Steel
Gear Spline/Teeth	25 T
Rotation Mode	Multi-turn
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	360°
Refresh Rate	333 Hz
Angle Sensor	Magnetic Encoder
Control System	RS485
Programmable	Yes
Electrical & Environment
Operating Voltage	9–16 V
Temperature	-20–60 °C
Water Rating	Waterproof
Idle Current	0.200 A
Connectivity
Wire Length	150 mm
Origin
Country of Origin	China

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Weight	Below Average Lighter than 33% of 145 Digital Large servos
Stall Current	Average Lower draw than 56% of 92 Digital Large servos

Performance Analysis

Shaft Power	6.85 W
Power Density	2.491 W/in³ More power-dense than 81% of 112 Digital Large servos
Torque Density	0.4445 oz-in/g
Torque-to-Volume Ratio	16.17 oz-in/in³
Speed-to-Weight	0.06667 (1/sec·g)
Speed-Torque Trade-off	6.67
Current-per-Torque Ratio	0.0562 A/oz-in
Voltage Range Width	7.0 V Wider voltage range than 89% of 124 Digital Large servos