{"product_id":"kpower-hbl838-servo-motor","title":"Kpower HBL838 Brushless Digital Servo, 4.8–8.4 V, PWM\/TTL\/RS-485 for RC Models and Robotics","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe \u003ca class=\"product-context-link\" href=\"https:\/\/rcdrone.top\/collections\/kpower-servo\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eKpower\u003c\/a\u003e HBL838 is a brushless \u003ca class=\"product-context-link\" href=\"https:\/\/rcdrone.top\/collections\/digital-servos\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003edigital servo\u003c\/a\u003e for RC models, UAV mechanisms and robotic motion control. Its aluminum-alloy case and metal gears provide a compact \u003ca class=\"product-context-link\" href=\"https:\/\/rcdrone.top\/collections\/servo-actuators\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eactuator\u003c\/a\u003e measuring 40 × 20 × 38 mm and weighing 66 g. It operates at 4.8–8.4 V, with PWM, TTL and RS-485 listed as control protocols. Voltage-specific torque and speed values help match the servo to the intended supply and mechanical load.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrushless motor with digital servo control.\u003c\/li\u003e\n\u003cli\u003eMetal gearing; the HBL series specifies high-precision metal gears.\u003c\/li\u003e\n\u003cli\u003eAluminum-alloy case and two ball bearings (2BB).\u003c\/li\u003e\n\u003cli\u003ePotentiometer position sensor.\u003c\/li\u003e\n\u003cli\u003e25T output horn spline with a 5.9 mm diameter.\u003c\/li\u003e\n\u003cli\u003e120° travel angle, described as customizable.\u003c\/li\u003e\n\u003cli\u003ePWM, TTL and RS-485 control protocols are listed for HBL838.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ch3\u003eHBL838 General Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eHBL838\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eServo type\u003c\/td\u003e\n\u003ctd\u003eDigital, brushless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStall torque, unconditioned listing value\u003c\/td\u003e\n\u003ctd\u003e28 kg; torque unit supplied as kg, with no test voltage stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated torque\u003c\/td\u003e\n\u003ctd\u003e7 kg; torque unit supplied as kg, with no test voltage stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque, unconditioned HBL838 comparison value\u003c\/td\u003e\n\u003ctd\u003e28 kg·cm; test voltage not stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo-load speed, unconditioned listing value\u003c\/td\u003e\n\u003ctd\u003e0.15 s\/60°; test voltage not stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e66 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e40 × 20 × 38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTravel angle range\u003c\/td\u003e\n\u003ctd\u003e120° (customizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating voltage\u003c\/td\u003e\n\u003ctd\u003e4.8–8.4 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorn gear spline\u003c\/td\u003e\n\u003ctd\u003e25T, Ø5.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003eBrushless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol\u003c\/td\u003e\n\u003ctd\u003ePWM \/ TTL \/ RS-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo-load current\u003c\/td\u003e\n\u003ctd\u003e4500 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition sensor\u003c\/td\u003e\n\u003ctd\u003ePotentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase material\u003c\/td\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBall bearings\u003c\/td\u003e\n\u003ctd\u003e2BB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking frequency\u003c\/td\u003e\n\u003ctd\u003e50–333 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e−10 to 50 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIP rating\u003c\/td\u003e\n\u003ctd\u003eIP42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHBL-series advertised cycle life\u003c\/td\u003e\n\u003ctd\u003eUp to 1,000,000 cycles; test conditions are not specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eVoltage-Specific Torque and Speed\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eAt 6.0 V\u003c\/th\u003e\n\u003cth\u003eAt 7.4 V\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorque\u003c\/td\u003e\n\u003ctd\u003e26.3 kg·cm\u003c\/td\u003e\n\u003ctd\u003e28.2 kg·cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed\u003c\/td\u003e\n\u003ctd\u003e0.16 s\/60°\u003c\/td\u003e\n\u003ctd\u003e0.15 s\/60°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe voltage-specific torque values are labelled as torque, without a separate rated or stall designation. Keep operating voltage within 4.8–8.4 V and operating temperature within −10 to 50 °C.\u003c\/p\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRC aircraft, UAVs and fixed-wing drones:\u003c\/strong\u003e Actuate control linkages using the compact 40 × 20 × 38 mm servo, with voltage-specific speed values for selecting the supply and motion timing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/8 and 1\/10 \u003c\/strong\u003e\u003cstrong\u003e\u003ca class=\"product-context-link\" href=\"https:\/\/rcdrone.top\/collections\/rc-car\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eRC car\u003c\/a\u003e\u003c\/strong\u003e\u003cstrong\u003e models:\u003c\/strong\u003e Drive steering or other mechanical linkages with metal gearing and a 25T, Ø5.9 mm output spline.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca class=\"product-context-link\" href=\"https:\/\/rcdrone.top\/collections\/robotics\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eRobotics\u003c\/a\u003e\u003c\/strong\u003e\u003cstrong\u003e, service robots and desktop robot arms:\u003c\/strong\u003e Position joints or linkages using digital control and potentiometer position sensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial automation:\u003c\/strong\u003e Position compact mechanisms using a brushless actuator with PWM, TTL and RS-485 listed as control interfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTable-tennis serving machines:\u003c\/strong\u003e Adjust serving-machine linkages with 120° servo travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedical-device mechanisms:\u003c\/strong\u003e Provide compact mechanical positioning with digital servo control and potentiometer position sensing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDocuments\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl-838-servo-motor-drawing.pdf?v=1792401551\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eKpower HBL838 Drawing — Drawing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-dmc-026-servo-motor-product-manual-3.pdf?v=1792378938\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eKpower Servo 3 — Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/hexfellow-hexmotor-4342-p-motor-ocservo-ocs-351-can-drawing.pdf?v=1790605115\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eOCServo OCS 351CAN Drawing — Ocservo Ocs 351 Can Drawing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Videos\u003c\/h2\u003e\n\u003ch2\u003eVisual Details\u003c\/h2\u003e\u003ch3\u003eProduct Video\u003c\/h3\u003e\u003cfigure class=\"tophitek-product-video-block\"\u003e\u003cvideo autoplay=\"autoplay\" class=\"tophitek-product-video\" controls=\"controls\" loop=\"loop\" muted=\"\" playsinline=\"\" src=\"https:\/\/cdn.shopify.com\/videos\/c\/o\/v\/a0d4b6808fbf4ab0a91235f5355be7ea.mp4\" style=\"display:block;width:auto;max-width:100%;height:auto;margin:0 auto\"\u003eYour browser does not support the video tag.\u003c\/video\u003e\u003c\/figure\u003e\u003cfigure class=\"tophitek-product-video-block\"\u003e\u003cvideo autoplay=\"autoplay\" class=\"tophitek-product-video\" controls=\"controls\" loop=\"loop\" muted=\"\" playsinline=\"\" src=\"https:\/\/cdn.shopify.com\/videos\/c\/o\/v\/78b127a991654eaca37267b9f150ab4d.mp4\" style=\"display:block;width:auto;max-width:100%;height:auto;margin:0 auto\"\u003eYour browser does not support the video tag.\u003c\/video\u003e\u003c\/figure\u003e\n\u003ch3\u003eFeatures and Design\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Servo rendering beside generic gear, protocol, case and connector customization choices\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-b197e7f47e.webp?v=1792401833\"\u003e\u003cfigcaption\u003eServo rendering beside generic gear, protocol, case, travel-angle and connector choices\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"HBL-series brushless motor, metal gear assembly and cycle-life feature panel\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-5cb8136860.webp?v=1792401837\"\u003e\u003cfigcaption\u003eThe HBL series advertises a lifespan of up to one million cycles; test conditions are not stated. The HBL series uses a high-torque brushless motor.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Custom servo development graphic with design, protection and protocol choices\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-8a863c7ded.webp?v=1792401862\"\u003e\u003cfigcaption\u003eCustom servo development graphic with design, protection, and protocol customization choices\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eOptions and Model Comparison\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"HBL830, HBL833, HBL835, HBL836 and HBL838 servo specification comparison\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-2cb4a7821f.webp?v=1792401841\"\u003e\u003cfigcaption\u003eThe HBL830, HBL833, HBL835, HBL836 and HBL838 comparison chart lists common dimensions of 40 × 20 × 38 mm. The HBL830, HBL833, HBL835, HBL836 and HBL838 comparison chart lists a common weight of 66 g.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Servo horn shapes labelled Flat, Cross, Round, Star and Single\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-c556c28e66.webp?v=1792401853\"\u003e\u003cfigcaption\u003eFive servo horn shapes labelled Flat, Cross, Round, Star and Single\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eSpecifications and Performance\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"HBL838 aluminum-case servo with voltage-specific torque, speed and application details\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-1c7001c18c.webp?v=1792401845\"\u003e\u003cfigcaption\u003eHBL838 torque is 26.3 kg.cm at 6.0 V. HBL838 torque is 28.2 kg.cm at 7.4 V.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Generic servo selection guidance for angle, speed, voltage and dead band\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-2c2aaefaa8.webp?v=1792401849\"\u003e\u003cfigcaption\u003eGeneric servo selection guidance for angle, speed, voltage and dead band beside assorted motors\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"CLS88WP speed and current chart at 7.4 V with servo duty-cycle guidance\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-6144b8b3ae.webp?v=1792401865\"\u003e\u003cfigcaption\u003eCLS88WP speed and current chart at 7.4 V with operating-duty guidance\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eSetup and Use\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Generic servo pulse-width diagram with five pulse-to-angle examples\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-eaa6069b87.webp?v=1792401857\"\u003e\u003cfigcaption\u003eGeneric servo pulse-width diagram mapping five input pulse widths to output shaft angles\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Exploded servo component diagram with motor, gear, sensor and housing selection guidance\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-4dc4204015.webp?v=1792401874\"\u003e\u003cfigcaption\u003eExploded servo component diagram with housing, gear, motor, sensor, and protocol selection guidance\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eInterfaces and Connections\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Generic three-wire connector diagram with brown ground, red supply and orange signal\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-72b8f87241.webp?v=1792401870\"\u003e\u003cfigcaption\u003eThree-wire servo connector diagram labeling brown ground, red supply, and orange signal\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eApplication Examples\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Kpower application grid covering robotics, automation, RC models, drones and other industries\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-0b7b69e875.webp?v=1792401879\"\u003e\u003cfigcaption\u003eKpower application grid covering robotics, smart homes, automation, RC models, drones, and agriculture\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch3\u003eAdditional Product Details\u003c\/h3\u003e\n\u003cfigure class=\"wp-block-image size-full\"\u003e\u003cimg alt=\"Generic ODM development workflow from needs evaluation to sampling and mass production\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/kpower-hbl838-brushless-digital-servo-67f35d32de.webp?v=1792401883\"\u003e\u003cfigcaption\u003eODM product-development workflow from needs evaluation through sampling and mass production\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"Kpower","offers":[{"title":"HBL838","offer_id":67820162908384,"sku":"KPO-676CC5CA","price":139.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/kpower-hbl838-servo-motor-elevated-557d375c38-01.webp?v=1792401515","url":"https:\/\/rcdrone.top\/products\/kpower-hbl838-servo-motor","provider":"RCDrone","version":"1.0","type":"link"}