{"product_id":"hitec-hs-81-standard-micro-servo","title":"Hitec HS-81 Standard Micro Servo","description":"\u003cmeta name=\"description\" content=\"Buy Hitec HS-81 Standard Micro Servo online in India at best price from The Tech Depot, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003eHitec HS-81 Standard Micro Servo\u003c\/h1\u003e\n\n\u003cp\u003eThe Hitec HS-81 is a compact standard micro servo motor engineered for precision positioning in robotics, RC aircraft, and embedded control systems requiring reliable angular displacement with minimal power consumption. Professional engineers and hobbyists rely on this servo for applications demanding consistent torque delivery and repeatable positioning accuracy in confined spaces. This servo solves the critical challenge of integrating high-performance motion control into weight-sensitive and space-constrained projects without compromising on responsiveness or durability.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Hitec HS-81 operates on the principle of closed-loop servo control, utilizing an internal potentiometer feedback mechanism to continuously monitor shaft position and maintain accuracy within tight tolerances. The servo accepts standard PWM (Pulse Width Modulation) signals between 1000-2000 microseconds, translating control signals into proportional angular displacement across a 45-degree travel range. The internal circuitry employs a precision analog comparator and motor driver IC to deliver smooth, jitter-free motion while automatically adjusting motor current based on load resistance, ensuring optimal power efficiency.\u003c\/p\u003e\n\n\u003cp\u003eWhat distinguishes the HS-81 is its lightweight aluminum gear train combined with a high-torque coreless motor, delivering exceptional power-to-weight ratio critical for aerial platforms and mobile robotics. The servo features a sealed gear compartment with Teflon-lined bushings that minimize friction and wear, extending operational lifespan even under continuous duty cycles. Its compact 23x12x29mm form factor makes it ideal for applications where space is premium, while maintaining sufficient torque output for standard control surface actuation in small-scale RC models and precision automation tasks.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eStandard Micro Servo Motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHitec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eHS-81\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e4.8V to 6.0V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque at 4.8V\u003c\/td\u003e\n\u003ctd\u003e1.39 kg-cm (0.136 N-m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque at 6.0V\u003c\/td\u003e\n\u003ctd\u003e1.74 kg-cm (0.171 N-m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed at 4.8V\u003c\/td\u003e\n\u003ctd\u003e0.12 seconds per 45 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed at 6.0V\u003c\/td\u003e\n\u003ctd\u003e0.10 seconds per 45 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e9 grams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e23 x 12 x 29 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Signal\u003c\/td\u003e\n\u003ctd\u003ePWM 1000-2000 microseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eStandard 3-pin JR connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCoreless Motor Design: Delivers smooth, vibration-free operation with minimal cogging, critical for precision camera gimbal stabilization and fine-tuned control applications\u003c\/li\u003e\n\u003cli\u003eTeflon-Lined Gear Bushings: Reduces friction and wear significantly, enabling extended service life even under continuous duty cycles typical in autonomous systems\u003c\/li\u003e\n\u003cli\u003eDual Voltage Compatibility: Operates efficiently across 4.8V to 6.0V range, allowing flexible power architecture in multi-servo battery-powered systems\u003c\/li\u003e\n\u003cli\u003eSealed Gear Compartment: Protects internal mechanisms from dust and moisture ingress, maintaining consistent performance in outdoor RC and environmental monitoring applications\u003c\/li\u003e\n\u003cli\u003eLightweight Construction: At only 9 grams, the HS-81 minimizes payload impact on small UAVs, quadcopters, and weight-critical robotics platforms\u003c\/li\u003e\n\u003cli\u003eFast Response Time: 0.10 second actuation speed at 6V ensures rapid control loop execution for dynamic stabilization and real-time servo control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRC Aircraft Control Surfaces: Ideal for aileron, elevator, and rudder actuation in small fixed-wing aircraft and flying wings where weight reduction directly improves flight duration and maneuverability\u003c\/li\u003e\n\u003cli\u003eQuadcopter and Drone Gimbals: Provides stable camera pan-tilt control with minimal power draw, essential for aerial photography and surveillance platforms requiring extended flight times\u003c\/li\u003e\n\u003cli\u003eRobotics Joint Actuation: Perfect for robotic arm fingers, pan-tilt heads, and articulated mechanisms in educational and research robotics where precise positioning and repeatability are paramount\u003c\/li\u003e\n\u003cli\u003ePrecision Automation Systems: Suitable for laboratory equipment positioning, optical mirror alignment, and automated testing rigs where compact form factor and accurate control are critical requirements\u003c\/li\u003e\n\u003cli\u003eModel Engineering Projects: Enables realistic motion simulation in scale models, animatronics, and hobbyist engineering projects requiring proportional control with minimal space allocation\u003c\/li\u003e\n\u003cli\u003eEmbedded Control Systems: Integrates seamlessly into microcontroller-based automation projects, IoT devices, and smart home systems requiring compact servo actuation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eTo integrate the Hitec HS-81 into your system, connect the three-pin JR connector to your servo controller or microcontroller PWM output, ensuring proper polarity (typically red to positive, black to ground, yellow\/white to signal). Supply operating voltage between 4.8V and 6.0V DC through the power rails, with adequate current capacity of at least 500mA per servo to handle peak stall current during high-load conditions. Program your controller to generate PWM signals with 50Hz frequency and pulse width between 1000-2000 microseconds, where 1500 microseconds typically centers the servo at neutral position and extreme values drive the shaft to mechanical limits.\u003c\/p\u003e\n\n\u003cp\u003eFor optimal performance, implement soft-start ramping in your control code to gradually increase servo demand rather than applying sudden full-deflection commands, which reduces mechanical stress on gears and extends servo lifespan. Mount the servo securely using the provided mounting brackets, ensuring the output shaft rotates freely without binding. If operating multiple servos from a single power source, use a servo power distribution board with individual capacitors (47-100 microfarads) across each servo's power pins to suppress voltage spikes during simultaneous actuation. Monitor servo temperature during extended operation, and allow cooling periods if the servo body becomes warm to touch, as sustained high temperatures degrade internal lubricants and potentiometer accuracy.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the HS-81 and larger servo models in terms of control precision?\u003c\/summary\u003e\n\u003cp\u003eThe HS-81 maintains the same feedback resolution and control linearity as larger Hitec servos, with positioning accuracy within 1-2 degrees across its 45-degree travel range. The primary difference is torque capacity and speed trade-off. The HS-81's compact design sacrifices absolute torque output but delivers faster response times and consumes less power, making it ideal for applications where precision positioning matters more than heavy load handling. For applications requiring both precision and higher torque, consider stacking multiple HS-81 servos or upgrading to the HS-311 standard servo.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use the HS-81 with Arduino or Raspberry Pi microcontrollers?\u003c\/summary\u003e\n\u003cp\u003eYes, the HS-81 is fully compatible with Arduino, Raspberry Pi, and any microcontroller capable of generating standard PWM signals at 50Hz frequency. Arduino users can utilize the Servo library to control the HS-81 with simple commands like servo.write(90) for 90-degree positioning. Raspberry Pi users should use GPIO PWM libraries or dedicated servo control libraries like RPi.GPIO or gpiozero. Ensure your microcontroller's PWM output can deliver at least 20mA current, and use a separate power supply for the servo rather than drawing power from the microcontroller's 5V rail to avoid voltage sag affecting control accuracy.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum continuous duty cycle for the HS-81?\u003c\/summary\u003e\n\u003cp\u003eThe HS-81 is rated for continuous operation at rated voltage with proper thermal management. However, sustained stall conditions (holding maximum load without movement) can generate excessive heat and degrade internal components. In practical applications, limit continuous stall time to 2-3 seconds maximum, and allow 10-15 second cooling periods between high-load operations. For applications requiring extended holding torque, implement intermittent duty cycles where the servo actively positions then releases load. Monitor servo temperature, and if the plastic housing becomes too hot to touch, reduce duty cycle or increase cooling intervals immediately.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the HS-81 waterproof or suitable for outdoor applications?\u003c\/summary\u003e\n\u003cp\u003eThe HS-81 features a sealed gear compartment but is not fully waterproof. It can tolerate light moisture and humidity typical in outdoor RC flying, but prolonged water immersion or high-pressure washdown will damage internal components. For outdoor use, apply silicone conformal coating to the circuit board and connector, and consider protective shrouding around the servo. For fully waterproof applications, explore specialized marine-grade servos or encapsulate the HS-81 in waterproof housings with mechanical linkages extending to control surfaces.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Tech Depot\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI, credit\/debit cards, net banking, EMI available\u003c\/li\u003e\n\u003cli\u003eTechnical Support: 24\/7 expert guidance via email and WhatsApp\u003c\/li\u003e\n\u003cli\u003eReturns: 7-day return policy on manufacturing defects only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuy Hitec HS-81 Standard Micro Servo Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eHitec HS-81 Standard Micro Servo\u003c\/strong\u003e online at \u003ca href=\"https:\/\/thetechdepot.in\"\u003eThe Tech Depot\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai\u003c\/p\u003e","brand":"The Tech Depot","offers":[{"title":"Default Title","offer_id":48742477398273,"sku":"TTD-5345","price":1712.96,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/1577\/3185\/files\/cf7c0fbaab574bd0489e155d2814c127.jpg?v=1778028228","url":"https:\/\/techdepot.in\/products\/hitec-hs-81-standard-micro-servo","provider":"Tech Depot India","version":"1.0","type":"link"}