{"publisher":"Xirkit — the structured parts marketplace","canonical":"https://www.xirkit.io/products/dsservo-ds3218-20-kg-digital-servo-dd58","markdown":"https://www.xirkit.io/products/dsservo-ds3218-20-kg-digital-servo-dd58/data.md","mcp":"https://www.xirkit.io/mcp","note":"Every value is traced to a cited source (see sources and per-value src). Null means unknown, never zero.","record":{"id":"dd58d863-e705-58cb-a5ae-b696d6572b8f","mpn":"DS3218MG","name":"DSServo DS3218 20 kg Digital Servo","manufacturer":"DSServo","family":"actuator","summary":"DSServo DS3218 (DS3218MG) is a standard-size digital metal-gear servo: 19 kg·cm stall torque at 5 V and 21.5 kg·cm at 6.8 V, 0.16 / 0.14 s per 60°, 4.8–6.8 V, 500–2500 µs PWM for 180° or 270° travel, 3 µs dead band, IP66, dual ball bearings, 25T spline. Case 40 × 20 × 40.4 mm, 54.5 mm over the ears, 60 g.","schema_version":"3.0","revision":null,"tags":["actuator","robotic actuator","robotics","robot arm","pwm servo","digital servo","hobby servo","metal gear servo","20kg servo","waterproof servo","standard servo","rc car servo","dsservo","arduino servo"],"sources":[{"other":{},"id":"datasheet","url":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg","title":"DSServo DS3218 20 kg Digital Servo datasheet","publisher":"DSServo","kind":"datasheet","retrieved_at":"2026-10-17T07:04:07+00:00","field_paths":["spec.constraints.electrical.supply_voltage_nominal_v","spec.geometry.body_length_mm","spec.geometry.cad.assumptions","spec.geometry.cad.bbox.height_mm","spec.geometry.cad.bbox.length_mm","spec.geometry.cad.bbox.width_mm","spec.geometry.cad.envelope_complete","spec.geometry.cad.mesh_path","spec.geometry.cad.step_path","spec.geometry.cad.verification","spec.geometry.dimensions.height_mm","spec.geometry.dimensions.length_mm","spec.geometry.dimensions.width_mm","spec.geometry.other.weight_g","spec.provides.actuator_type","spec.provides.control_interface","spec.provides.control_modes","spec.provides.encoder","spec.provides.features","spec.provides.gear_type","spec.provides.integrated_driver","spec.provides.motor_type","spec.provides.no_load_speed_rpm","spec.provides.peak_torque_nm","spec.usage.connectors","spec.usage.pinout_complete","spec.usage.requirements.rated_voltage_v"],"notes":"sha256 f700f7c07ee609e8d80c3dd8d1d1ecc6df642c0996d983a5b503ff599ae08cfe"},{"other":{},"id":"offer0","url":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg?variant=44863848874208","title":"rcdrone.top (RCDrone) listing","publisher":null,"kind":"distributor","retrieved_at":"2026-10-17T07:04:07+00:00","field_paths":["offers"],"notes":null}],"assets":[{"other":{},"kind":"datasheet","url":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg","label":"Datasheet","verification":"manufacturer","notes":null},{"other":{},"kind":"image","url":"https://rcdrone.top/cdn/shop/files/H1c0c392d6c444a89b4fa6856412a7cccG_81588a05-1294-47d5-94f4-f1c90c624640.webp?v=1714920042","label":"DSServo DS3218MG 20 kg servo, front view with lead (RCDrone)","verification":"unverified","notes":"inspected: black/pink case labelled DS3218 MG, '20 Kg Dc4.8~6.8v DSSERVO DIGITAL SERVO', brass 25T spline, red/white/black lead with 3-pin plug. Retailer image → unverified."},{"other":{},"kind":"cad","url":"dsservo-ds3218.step","label":"STEP (generated from datasheet drawing)","verification":"generated","notes":"cad_check passed"}],"offers":[{"other":{"sku":"1005003446676428-DS3218MG 180","packaging":"single unit, 180° variant; 270° variant $16.28; ships from China (AliExpress-linked SKU), sold in USD","price_breaks":[]},"supplier":"rcdrone.top (RCDrone)","url":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg?variant=44863848874208","currency":"USD","unit_price":15.16,"stock_status":"in_stock","region":"US","minimum_quantity":1,"checked_at":"2026-10-17T07:04:07+00:00","lead_time_days_min":null,"lead_time_days_max":null,"destination":"US","destination_postal_code":null,"notes":null,"price_basis":"listed","unit_price_max":null}],"best_for":[{"other":{},"label":"Robot arm joints (shoulder, elbow)","reason":"Standard-size position servo with 19 kg·cm stall torque at 5 V and 21.5 kg·cm at 6.8 V over 180° or 270° on a 500–2500 µs PWM signal, 60 g — the common pick for desktop robot-arm shoulders and elbows; size the load well below stall.","basis":"engineering_inference"},{"other":{},"label":"Grippers and claws","reason":"21.5 kg·cm stall torque in a 40 × 20 mm case with a 25T metal spline drives a gripper jaw linkage with more force than 9 g micro servos.","basis":"engineering_inference"}],"children":[],"spec":{"other":{},"usage":{"other":{},"pinout":[],"derived":{},"connectors":[{"id":"servo","kind":"3-wire servo lead with a 3-pin female servo plug (signal, +, −)","other":{},"pin_count":3}],"pin_mappings":[],"requirements":{"other":{},"data_inputs":[],"power_inputs":[],"rated_voltage_v":6.8},"pinout_complete":false},"geometry":{"cad":{"bbox":{"width_mm":20,"height_mm":44.4,"length_mm":54.5},"features":[],"mesh_path":"dsservo-ds3218.stl","step_path":"dsservo-ds3218.step","assumptions":["ear_thickness=3 mm assumed: ear thickness not dimensioned — ≈3 mm scaled off the side view, for the CAD envelope only","output_offset_x=29.8 mm assumed: spline position not dimensioned; scaled off the top view (≈29.8 of 40 mm) for the CAD envelope only","shaft_d=5.8 mm assumed: spline diameter not dimensioned (25T arm) — 5.8 mm assumed for the CAD envelope only","shaft_len=4 mm assumed: spline height not dimensioned — 4 mm assumed for the CAD envelope only"],"verification":"generated","envelope_complete":false},"other":{"weight_g":60},"derived":{},"dimensions":{"other":{},"width_mm":20,"height_mm":44.4,"length_mm":54.5},"feature_boxes":[],"body_length_mm":40.5,"mounting_holes":[]},"provides":{"other":{},"derived":{},"encoder":"potentiometer","features":["DS3218MG pro (different SKU): 21 kg·cm at 5 V, 23.5 kg·cm at 6.8 V, 0.12 / 0.09 s per 60°, 5.0–6.8 V","500–2500 µs pulse for 180° (or 270° on the 270° variant); 50–333 Hz frame rate","Dead band 3 µs","IP66 waterproof (rubber-sealed case screws)","Copper and aluminium metal gears (hard anodized), CNC aluminium middle shell, dual ball bearings, precision potentiometer","Ships with a 25T adjustable metal servo arm","Motor conflict: rcdrone says \"Carban Brush Motor\", thinkrobotics says \"DC Motor\" — both describe a brushed DC motor","Size conflict: text 40 × 20 × 40.5 mm; drawing case height 40.4 mm","A reviewer notes videos claiming it is not truly digital and could not confirm either way"],"gear_type":"copper & aluminium metal gear train","motor_type":"brushed_dc","capabilities":[],"actuator_type":"pwm_servo","control_modes":["position (180° or 270°)"],"peak_torque_nm":2.10843,"control_interface":"PWM","integrated_driver":true,"no_load_speed_rpm":71.4},"compliance":{"other":{},"derived":{},"certifications":[]},"constraints":{"other":{},"derived":{},"thermal":{"other":{}},"electrical":{"other":{},"supply_voltage_nominal_v":6.8}}},"other":null,"source_type":"pdf","source_ref":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg","datasheet":{"cad":{"bbox":{"max":[47.25,20,44.4],"min":[-7.25,0,0],"width_mm":20,"height_mm":44.4,"length_mm":54.5},"check":{"failed":[],"passed":true},"expected":[{"x":54.5,"y":20,"name":"ears","what":"box_xy"},{"d":5.8,"x":29.8,"y":10,"axis":"z","name":"shaft","what":"cylinder"},{"what":"envelope_z","value":44.4}],"archetype":"servo_case","mesh_path":"/Users/sumeet/Documents/Xirkit Parent/XirkitOnboard/work/dsservo-ds3218/07_cad/part.stl","step_path":"/Users/sumeet/Documents/Xirkit Parent/XirkitOnboard/work/dsservo-ds3218/07_cad/part.step","views_png":"/Users/sumeet/Documents/Xirkit Parent/XirkitOnboard/work/dsservo-ds3218/07_cad/views.png","export_stl":"dsservo-ds3218.stl","assumptions":["ear_thickness=3 mm assumed: ear thickness not dimensioned — ≈3 mm scaled off the side view, for the CAD envelope only","output_offset_x=29.8 mm assumed: spline position not dimensioned; scaled off the top view (≈29.8 of 40 mm) for the CAD envelope only","shaft_d=5.8 mm assumed: spline diameter not dimensioned (25T arm) — 5.8 mm assumed for the CAD envelope only","shaft_len=4 mm assumed: spline height not dimensioned — 4 mm assumed for the CAD envelope only"],"export_step":"dsservo-ds3218.step","source_step":null,"verification":"generated","envelope_complete":false},"chips":[],"fields":{"weight":{"src":{"page":8,"quote":"- Weight: 60 g (2.12 oz)","method":"text"},"unit":"g","value":60},"encoder":{"src":{"page":8,"quote":"The DS3218 is a large torque digital servo with precision potentiometers, offering stable, low noise operation. 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It is IP66 waterproof ideal for operations under water splash. These are built with high-precision metal gears with hard anodizing, CNC aluminium middle Shell, and dual ball bearings.","method":"text"},"unit":null,"value":true}},"groups":{"all":[]},"source":{"url":"https://rcdrone.top/products/dsservo-waterproof-servo-ds3218-20kg-ds3225-25kg-ds3235-35kg","pages":12,"sha256":"f700f7c07ee609e8d80c3dd8d1d1ecc6df642c0996d983a5b503ff599ae08cfe","onboarded_at":"2026-10-17T07:08:37+00:00"},"coverage":{"pct":79.4,"score":"27/34","passed":true,"explained_nulls":["gear_ratio","rated_torque","rated_speed","rated_current","peak_current","kt","backlash","operating_temperature","lifecycle","compliance"]},"entities":[],"taxonomy":{"dimensions":{"role":"mechanical_dimensions","definition":"Size (diameter × length), packing size, dimension drawing or mounting pattern"},"site_chrome":{"role":"other","definition":"Website navigation, FAQs, reviews, related products, support links, footers"},"model_comparison":{"role":"electrical_ratings","definition":"Comparison table of several models of the series (one row per model: voltage, power, torque, current, speed, ratio, weight, size, encoder)"},"pricing_ordering":{"role":"ordering_commercial","definition":"Price, options (KV, driver board yes/no), SKU, shipping, payment, points"},"product_overview":{"role":"identity_overview","definition":"Product description / highlights: what the actuator integrates (motor, gearbox, driver, encoder), control modes, protections, applications"},"connectors_wiring":{"role":"pins_or_terminals","definition":"Power / CAN / UART connectors, cables in the wiring pack, pin assignments"},"specification_table":{"role":"electrical_ratings","definition":"Specification grid: voltage, rated/peak torque, speeds, currents, Kt/Kv, gear ratio, backlash, back-drive, encoder, inertia, weight, connectors, temperature"}},"variants":{},"commercial":{"other":{},"checked_at":"2026-10-17T07:04:07+00:00","compliance":[],"ordering_codes":[{"code":"DS3218MG","description":"model (180° and 270° travel variants)"},{"code":"1005003446676428-DS3218MG 180","description":"RCDrone SKU, 180° variant"}]},"mechanical":{"dims":{"ear_z":{"src":{"page":4,"quote":"27.7","figure":"p004_img26 dimension drawing","method":"drawing"},"note":"case bottom to the ear plane","unit":"mm","value":27.7},"length":{"src":{"page":8,"quote":"- Size: 40 x 20 x 40.5 mm ( 1.58 x 0.79 x 1.60 in)","method":"text"},"note":"height along the output axis as listed (spline excluded on the drawing, which gives 40.4 to the case top); 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Retailer image → unverified.","resolved_url":"https://rcdrone.top/cdn/shop/files/H1c0c392d6c444a89b4fa6856412a7cccG_81588a05-1294-47d5-94f4-f1c90c624640.webp?v=1714920042"},{"other":{},"kind":"cad","url":"dsservo-ds3218.step","label":"STEP (generated from datasheet drawing)","verification":"generated","notes":"cad_check passed","resolved_url":"https://wlrumvsjnliyuuvzwnrt.supabase.co/storage/v1/object/public/geometry/dsservo-ds3218.step"}],"cad":{"verification":"generated","envelope_complete":false,"assumptions":["ear_thickness=3 mm assumed: ear thickness not dimensioned — ≈3 mm scaled off the side view, for the CAD envelope only","output_offset_x=29.8 mm assumed: spline position not dimensioned; scaled off the top view (≈29.8 of 40 mm) for the CAD envelope only","shaft_d=5.8 mm assumed: spline diameter not dimensioned (25T arm) — 5.8 mm assumed for the CAD envelope only","shaft_len=4 mm assumed: spline height not dimensioned — 4 mm assumed for the CAD envelope only"],"step_path":"dsservo-ds3218.step","mesh_path":"dsservo-ds3218.stl","footprint_svg_path":null,"bbox":{"length_mm":54.5,"width_mm":20,"height_mm":44.4},"features":[],"step_url":"https://wlrumvsjnliyuuvzwnrt.supabase.co/storage/v1/object/public/geometry/dsservo-ds3218.step","mesh_url":"https://wlrumvsjnliyuuvzwnrt.supabase.co/storage/v1/object/public/geometry/dsservo-ds3218.stl","footprint_svg_url":null},"limitations":["Generated geometry is an approximate mechanical envelope; inspect original manufacturer CAD when available.","Generated footprint_svg_path is an outline, not a verified electrical land pattern.","Xirkit does not run fit checks; download step_url and test fit against your own enclosure."]}}}