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HS-425BB Servo

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The HS-425BB is offered with dual ball bearings, impact resin gears and high performance circuitry. As one of Hitec's longest running production servos, it has proven to be a durable and dependable product year after year.

Standard Servo Schematic 2 A = .780” (19.82mm)
B = .530” (13.47mm)
C = 1.33” (33.79mm)
D = .400” (10.17mm)
E = .380” (9.66mm)
F = 1.19” (30.22mm)
G = .460” (11.68mm)
H = 1.05” (26.67mm)
J = 2.08” (52.84mm)
K = .368” (9.35mm)
L = .172” (4.38mm)
M = 1.57” (39.88mm)
X = .120” (3.05mm)
Dimensions 1.59" x 0.77" x 1.44" (40.39 x 19.56 x 36.58mm)
Product Weight 1.6oz (45.5g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.21sec/60°
No-Load Speed (6.0V) 0.16sec/60°
Stall Torque (4.8V) 45.82 oz/in. (
Stall Torque (6.0V) 56.93 oz/in. (
Max PWM Signal Range (Standard) 553-2520μsec
Travel per µs (out of box) .096°/μsec
Max Travel (out of box) 188°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8mA
Current Drain - idle (6.0V) 8.8mA
Current Drain - no-load (4.8V) 150mA
Current Drain - no-load (6V) 180mA
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite
Potentiometer Drive Direct Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearings
Gear Type Straight Cut Spur
Gear Material Nylon
Wire Length 11.81" (300mm)
Wire Gauge 25AWG

This servo can rotate up to 188° when given a PWM signal ranging from 553 to 2520 microseconds. Since most R/C controllers cannot generate this wide of a signal range, you can purchase our servo stretcher for extended rotation operation.

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