Hitec HS-85BB Premium Micro Servo
Hitec HS-85BB Premium Micro Servo
Hitec HS-85BB Premium Micro Servo
The Hitec HS-85BB is a premium micro servo motor engineered for precision motion control in compact applications requiring high torque density and reliable performance. Professional roboticists, drone builders, and RC enthusiasts rely on this servo for applications demanding accurate angular positioning with minimal power consumption. This servo solves the critical challenge of achieving smooth, repeatable motion control in weight-sensitive projects where standard servos are too large or power-hungry.
Product Overview
The Hitec HS-85BB operates on the principle of pulse-width modulation (PWM) control, where varying pulse duration commands specific shaft angles with exceptional accuracy. The servo contains a miniature DC motor coupled to a precision gearbox that reduces motor speed while multiplying torque output, combined with a potentiometer-based feedback circuit that continuously monitors shaft position. This closed-loop feedback system enables the servo to hold commanded positions against external load variations, making it ideal for applications requiring stable, repeatable motion without drift or oscillation.
What distinguishes the HS-85BB is its ultra-compact form factor paired with impressive torque specifications for its size class. The servo features a lightweight aluminum case design that minimizes inertial loading on control systems, while internal ball bearings reduce friction and extend operational lifespan. The servo's rapid response time and smooth speed characteristics make it particularly valuable in aerial platforms and robotic manipulators where weight distribution directly impacts performance and flight duration.
Key Specifications
| Specification | Details |
| Product Type | Premium Micro Servo Motor |
| Brand | Hitec |
| Model | HS-85BB |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Operating Voltage | 4.8V to 6.0V DC |
| Torque Output | 1.6 kg-cm at 4.8V, 1.8 kg-cm at 6.0V |
| Speed | 0.11 sec/60 degrees at 4.8V |
| Control Signal | PWM 1500 microseconds neutral |
| Dimensions | 23.4 x 12.2 x 22.2 mm |
| Weight | 9.0 grams |
Key Features
- Ultra-compact micro design at only 9 grams, enabling integration into weight-critical applications like quadcopters and aerial platforms without compromising flight stability
- High torque-to-weight ratio delivering 1.8 kg-cm of torque at 6.0V in a footprint smaller than a postage stamp, ideal for robotic joints and control surfaces
- Precision ball bearing construction reducing friction and backlash to ensure accurate position holding within 1-2 degrees, critical for camera gimbal stabilization and fine motor control
- Wide operating voltage range from 4.8V to 6.0V with linear torque scaling, allowing flexible power system design and battery configuration optimization
- Fast response time of 0.11 seconds per 60-degree rotation enabling rapid feedback control loops and dynamic motion compensation in real-time applications
- Standard PWM interface with 1500 microsecond neutral point ensuring compatibility with all major flight controllers, microcontroller boards, and servo control systems
Applications and Use Cases
- Drone and quadcopter camera gimbals requiring smooth pan-tilt motion with minimal payload impact, where the HS-85BB's lightweight design preserves flight time while delivering stable video capture
- Robotic arm and manipulator joints in educational and research robotics where precise angular positioning and repeatable motion are essential for task execution and safety
- RC aircraft control surfaces including ailerons, elevators, and rudders on small-scale aircraft where servo weight directly affects aerodynamic efficiency and maneuverability
- Automated camera tracking systems and telescope mounts requiring smooth, jitter-free motion control with rapid response to directional commands
- Animatronics and mechanical puppet systems where compact servos enable realistic joint movement in confined spaces with natural motion characteristics
- 3D printer and CNC machine auxiliary controls such as filament feeders and tool changers requiring precise positioning in compact mounting envelopes
How to Use
Begin by verifying your power supply delivers clean 4.8V to 6.0V DC current with adequate capacity for your servo count. Connect the servo's three-wire connector to your control system: the red wire to positive voltage, black wire to ground, and the white or yellow signal wire to your PWM output pin on your microcontroller or flight controller. Ensure all ground connections are common between the servo, power supply, and control system to prevent signal integrity issues. Program your control system to generate standard PWM signals with pulse widths between 1000 to 2000 microseconds, where 1500 microseconds represents the neutral center position, values below 1500 rotate the servo counterclockwise, and values above 1500 rotate clockwise.
For optimal performance, mount the servo using the provided mounting brackets with rubber grommets to isolate vibration and protect the internal gearbox from mechanical shock. Apply servo horn arms appropriate to your application, ensuring the arm is centered at the 1500 microsecond neutral position before final installation. Test the full range of motion without load first to verify smooth operation across the entire 60-degree travel range. When integrating into applications like quadcopters or robotic systems, calibrate the servo endpoints in your control software to match your mechanical requirements, typically using 1100 microseconds for full counterclockwise and 1900 microseconds for full clockwise rotation.
Frequently Asked Questions
What is the maximum continuous current draw of the HS-85BB servo?
The HS-85BB draws approximately 100-150 mA at idle with no load, and up to 500-700 mA under full torque load at 6.0V. When designing power systems, especially for multiple servos, ensure your voltage regulator or battery can supply peak current without voltage sag below 4.8V, as insufficient current causes erratic servo behavior and position drift. For applications with 4 or more servos, use dedicated servo power distribution boards with bulk capacitors to handle transient current spikes.
Can the HS-85BB be used with 3.7V LiPo batteries or lower voltages?
The HS-85BB minimum operating voltage is 4.8V. Using voltages below this specification significantly reduces torque output and servo speed, and may cause the servo to lose position holding ability under load. Single-cell LiPo batteries at 3.7V nominal are insufficient. You must use either a 2S LiPo configuration (7.4V nominal, regulated down to 5V) or a dedicated 5V power supply. Never operate the servo above 6.0V as this damages internal electronics and voids warranty.
What is the typical lifespan and maintenance requirements for the HS-85BB?
With proper use within rated specifications, the HS-85BB typically provides 1000+ hours of operational life. The ball bearing construction requires no routine lubrication. Extend lifespan by avoiding mechanical shock, preventing water ingress, operating within voltage specifications, and ensuring adequate cooling in continuous-use applications. If the servo becomes sluggish or exhibits jittery movement after extended use, the gearbox may require professional servicing by authorized Hitec repair centers.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Tech Depot
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Hitec HS-85BB Premium Micro Servo Online in India
Purchase the Hitec HS-85BB Premium Micro Servo online at The Tech Depot, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Hitec HS-85BB Premium Micro Servo with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.