Overview
The Hitec HS-77BB is a low-profile high-torque analog servo with ball-bearing output, purpose-built for installations where servo height is restricted but strong torque is required. With 114 oz-in of torque, dual ball bearings, and a low-profile body, the HS-77BB is a popular pick for retracts, slim RC aircraft installations, and low-height ground-vehicle setups.
The deliberate 0.34 sec/60° transit reflects the high-torque mechanical advantage of the gear train — perfect for jobs where steady, controlled motion matters more than speed.
Key Features
- Low-profile servo body for tight installations
- High-torque output: 114 oz-in at 6V
- Dual ball bearings
- 0.34 sec/60° transit at 6V
- Reliable analog circuit
- Trusted Hitec quality
Performance Benefits
- Fits where standard-height servos won't
- Strong torque for retracts and high-load slim installations
- Smooth output from ball-bearing support
- Reliable analog operation
Usage Notes
Best Used With RC Scale(s): The HS-77BB is purpose-built for RC aircraft retract installations, scale RC builds with restricted servo bays, and any application where servo height is constrained. Suitable across a wide range of scales depending on application — from sport aircraft to 1/8 scale ground vehicles with low-height servo mounts.
- RC aircraft retract installations
- Scale RC aircraft with low-height servo bays
- Low-profile ground vehicle installations
- Specialty RC builds requiring slim servos
Technical Specs
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Type: Low-Profile High-Torque Ball-Bearing Analog Servo
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Operating Voltage: 4.8V - 6.0V
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Speed: 0.34 sec/60° @ 6V
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Torque: 114 oz @ 6V
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Bearings: Dual ball bearings
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Form Factor: Low-profile
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Part Number: 31077S
What's Included
- (1) Hitec HS-77BB Low-Profile High-Torque Servo
Summary
The Hitec HS-77BB is the specialty low-profile high-torque analog servo for retracts and slim installations. 114 oz of torque, dual ball bearings, and a low-height body make it the right pick for tight, demanding RC servo bays.
