If this servo is to be used on a Forza 450 with "sub trim free" metal servo arms you will also need part no JR77202 - Servo Horn Inner for E397.
Dimentions: 12 x 23 x 22mm
Weight: 10g
Stall Torque (kg-cm): 1.8@5.0v/ 2.1@6.0v/ 2.5@7.0v/ 3.0@8.4v
Speed (sec/60deg) : 0.13@5.0v/ 0.11@6.0v/ 0.09@7.0v/ 0.08@8.4v
Motor Type: Coreless
Spline size M5-T21
System PWM
Gears Material: B/plastic, C/Metal, D/Met, E/Metal. F/Metal.
Designed to take up to 8.4V, but recommended voltage range is from 5-7V.