{ "id": "ac-robstride-rs04", "name": "RobStride RS04 QDD Joint Actuator", "subcategory": "joint-actuators", "brand": "RobStride", "mpn": "RS04", "summary": "Highest-torque RobStride QDD joint (120 N·m peak) for humanoid hips and knees; rated 40 N·m only with a 345x345 mm aluminium plate (35 N·m with 220x200 mm).", "maker": { "name": "Beijing Lingzu Shidai Technology (RobStride, 北京灵足时代科技)", "country": "CN", "role": "brand" }, "made_in": "unknown", "specs": { "peak_torque_nm": { "label": "Peak torque", "value": "120 N·m", "num": 120, "unit": "N·m" }, "rated_torque_nm": { "label": "Rated torque", "value": "40 N·m (with specified heat-sink plate)", "num": 40, "unit": "N·m" }, "ratio": { "label": "Gear ratio", "value": "9:1 planetary", "num": 9 }, "voltage_v": { "label": "Voltage", "value": "48 V rated (15-60 V)", "num": 48, "unit": "V" }, "mass_g": { "label": "Mass", "value": "1420 g", "num": 1420, "unit": "g" }, "interface": { "label": "Interface", "value": "CAN (RobStride CAN/CANopen protocol docs)", "num": null } }, "price": [ { "qty": 1, "usd": 168.87, "kind": "list", "source": "https://github.com/RobStride/Product_Information/blob/main/README.md", "as_of": "2026-10-29", "note": "CNY 1199 in RobStride catalog dated 2026-07-13; maker lists CNY; USD is a conversion at an assumed ~7.10 CNY/USD, not a USD quote" } ], "moq": "unknown", "lead_time": "unknown", "hts": "unknown", "compliance": { "ndaa": "unknown", "blue_uas": "unknown", "fcc": "n/a", "notes": "Rated torque per RobStride spec dated 2026-07-13 assumes a specified aluminium heat-sink plate; free-standing continuous torque unknown. Interface: CAN per RobStride repo docs (CANopen doc linked); per-model interface not stated in the README." }, "links": { "product": "https://robstride.com/", "datasheet": "https://github.com/RobStride/Product_Information/blob/main/README.md", "cad": null }, "equivalents": [ "ac-myactuator-rmd-x8-p20-120", "ac-encos-ec-a8116-p1-18", "ac-cubemars-ak80-64", "ac-synapticon-actilink-jd-circulo-12" ], "pairs_with": [], "maglev": { "custom": "RobStride publishes customization scope on its About page (per Maglev research CN001); no Maglev contact or quote yet.", "directory_ref": null }, "sources": [ { "url": "https://github.com/RobStride/Product_Information/blob/main/README.md", "what": "specs + CNY catalog price (spec dated 2026-07-13)" } ], "confidence": "VERIFIED", "category": "actuators", "subcategory_title": "Integrated Joint Actuators", "icon": "joint", "image": { "url": "https://parts.trymaglev.com/img/ac-robstride-rs04.webp", "thumb": "https://parts.trymaglev.com/img/t/ac-robstride-rs04.webp", "source_image": "https://cdn.shopify.com/s/files/1/0621/0050/4774/files/TB-ROBSTRIDE04-2.jpg?v=1782184977", "source_page": "https://openelab.io/products/robstride04-qdd-120n-m-integrated-joint-motor-module", "background": "removed (Apple Vision)", "as_of": "2026-10-29" }, "origin": { "code": "CN", "basis": "hq" }, "hts_resolved": { "code": "8501.31.40.00", "typical": true, "key": "integrated-joint-actuators", "basis": "subcategory", "confidence": "low", "note": "No modern ruling found for a motor+reducer+driver+encoder robot joint. Treat as unresolved." }, "us_duty_by_origin": { "as_of": "2026-10-29", "rates": [ { "origin": "CN", "duty_pct": 41.5, "possible_pct": 0, "usmca": false }, { "origin": "TW", "duty_pct": 10, "possible_pct": 0, "usmca": false }, { "origin": "VN", "duty_pct": 16.5, "possible_pct": 0, "usmca": false }, { "origin": "IN", "duty_pct": 14, "possible_pct": 0, "usmca": false }, { "origin": "JP", "duty_pct": 12.5, "possible_pct": 0, "usmca": false }, { "origin": "KR", "duty_pct": 12.5, "possible_pct": 0, "usmca": false }, { "origin": "DE", "duty_pct": 10, "possible_pct": 0, "usmca": false }, { "origin": "MX", "duty_pct": 14, "possible_pct": 0, "usmca": true }, { "origin": "US", "duty_pct": 0, "possible_pct": 0, "usmca": false } ] }, "url": "https://parts.trymaglev.com/p/ac-robstride-rs04/", "markdown": "https://parts.trymaglev.com/p/ac-robstride-rs04/index.md", "equivalents_detail": [ { "id": "ac-myactuator-rmd-x8-p20-120", "name": "MyActuator RMD-X8-P20-120 Planetary Actuator", "brand": "MyActuator", "mpn": "RMD-X8-P20-120-E", "category": "actuators", "subcategory": "joint-actuators", "summary": "MyActuator's 120 N·m flagship planetary joint for humanoid hips/knees; Maglev's first-wave benchmark SKU.", "origin": "CN", "origin_basis": "hq", "price_usd": 999, "price_qty": 1, "ndaa": "unknown", "blue_uas": "unknown", "image": "https://parts.trymaglev.com/img/ac-myactuator-rmd-x8-p20-120.webp", "url": "https://parts.trymaglev.com/p/ac-myactuator-rmd-x8-p20-120/", "json": "https://parts.trymaglev.com/api/parts/ac-myactuator-rmd-x8-p20-120.json" }, { "id": "ac-encos-ec-a8116-p1-18", "name": "ENCOS EC-A8116-P1-18 Planetary Joint", "brand": "ENCOS", "mpn": "EC-A8116-P1-18", "category": "actuators", "subcategory": "joint-actuators", "summary": "Nanjing-made 18:1 planetary joint with dual encoders and CAN; 130 N·m peak class for humanoid legs.", "origin": "CN", "origin_basis": "hq", "price_usd": null, "price_qty": null, "ndaa": "unknown", "blue_uas": "unknown", "image": "https://parts.trymaglev.com/img/ac-encos-ec-a8116-p1-18.webp", "url": "https://parts.trymaglev.com/p/ac-encos-ec-a8116-p1-18/", "json": "https://parts.trymaglev.com/api/parts/ac-encos-ec-a8116-p1-18.json" }, { "id": "ac-cubemars-ak80-64", "name": "CubeMars AK80-64 KV80 Robotic Actuator", "brand": "CubeMars", "mpn": "AK80-64 KV80", "category": "actuators", "subcategory": "joint-actuators", "summary": "High-ratio (64:1) planetary joint for arms and exoskeletons that need holding torque more than backdrivability.", "origin": "CN", "origin_basis": "hq", "price_usd": 889.9, "price_qty": 1, "ndaa": "unknown", "blue_uas": "unknown", "image": "https://parts.trymaglev.com/img/ac-cubemars-ak80-64.webp", "url": "https://parts.trymaglev.com/p/ac-cubemars-ak80-64/", "json": "https://parts.trymaglev.com/api/parts/ac-cubemars-ak80-64.json" }, { "id": "ac-synapticon-actilink-jd-circulo-12", "name": "Synapticon ACTILINK-JD Circulo 12 Dynamic Actuator", "brand": "Synapticon", "mpn": "AJD-12-120-200-ECS1SS-N-00", "category": "actuators", "subcategory": "joint-actuators", "summary": "German EtherCAT joint actuator (9:1, 120 mm) with SOMANET Circulo 9 drive and STO/Safe Motion option, for humanoid legs and heavy legged-robot joints.", "origin": "DE", "origin_basis": "hq", "price_usd": null, "price_qty": null, "ndaa": "unknown", "blue_uas": "unknown", "image": "https://parts.trymaglev.com/img/ac-synapticon-actilink-jd-circulo-12.webp", "url": "https://parts.trymaglev.com/p/ac-synapticon-actilink-jd-circulo-12/", "json": "https://parts.trymaglev.com/api/parts/ac-synapticon-actilink-jd-circulo-12.json" } ], "pairs_with_detail": [] }