JR E3977

Search Amazon Search eBay

Compatible Hardware

Amazon eBay

*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	T0074534
Category	Hobby
Performance
Torque	6.0V 30.60 oz-in Average 5.0V 36.70 oz-in
Speed	7.0V 0.08 sec/60° 6.0V 0.09 sec/60° Above Average 5.0V 0.11 sec/60°
Physical
Weight	0.72 ozBelow Average
Dimensions	L 0.906 in W 0.472 in H 0.866 in
Drivetrain
Motor Type	Coreless
Gears	Hybrid
Control & Signal
Modulation	Digital
Control System	PWM
Electrical & Environment
Operating Voltage	6–7 V
Connectivity
Connector	JR (Universal) estimate

Submit Missing Data Report an Error

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.

Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Average Stronger than 61% of 328 Digital Micro servos at 6.0V
Speed	Above Average Faster than 72% of 328 Digital Micro servos at 6.0V
Weight	Below Average Lighter than 10% of 620 Digital Micro servos

Performance Analysis

Shaft Power	0.62–0.63 W
Power Density	1.697 W/in³ More power-dense than 46% of 590 Digital Micro servos
Torque Density	1.4927 oz-in/g Stronger than 9% of 327 Digital Micro servos
Torque-to-Volume Ratio	82.60 oz-in/in³ Denser torque than 60% of 327 Digital Micro servos
Speed-to-Weight	0.54201 (1/sec·g) Faster than 22% of 327 Digital Micro servos
Speed-Torque Trade-off	2.75 Better balanced than 41% of 327 Digital Micro servos
Speed Gain per Volt	12.49%/V More voltage-responsive (speed) than 22% of 273 Digital Micro servos
Voltage Range Width	1.0 V Wider voltage range than 4% of 511 Digital Micro servos