{"product_id":"feetech-sts3250-serial-bus-servo-50kg","title":"Feetech STS3250 Serial Bus Servo, 50 kg·cm 12 V, Full Metal Case, 360° Magnetic Encoder, Upgrade for SO-ARM101 Shoulder Joints","description":"\u003cp\u003e\u003cstrong\u003eThe Feetech STS3250 is a 12 V serial bus servo with 50 kg·cm of torque in a full metal case, using the same protocol, connector and 25 T spline as the STS3215, so it drops into SO-ARM101 shoulder and elbow joints, LeKiwi bases and other LeRobot-compatible robots that need more holding force.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe STS3250 is the metal-case big brother of the STS3215: same bus protocol and cable, 50 kg·cm instead of 30, aluminium body and coreless motor. Builders drop it into the shoulder and elbow of SO-101 arms that carry heavier grippers or cameras, and into LeKiwi bases. Works with the same BusLinker \/ Waveshare adapters and LeRobot configs.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eUpgrading the shoulder and elbow of an SO-ARM101 that carries a heavier gripper or camera\u003c\/li\u003e\n\u003cli\u003eLeKiwi drive wheels and heavier mobile bases\u003c\/li\u003e\n\u003cli\u003eQuadrupeds, humanoids and grippers that stall 30 kg·cm servos\u003c\/li\u003e\n\u003cli\u003eAny Feetech-bus robot needing 50 kg·cm with position feedback\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eBuilders who have hit the torque limit of the STS3215 and want a plug-compatible step up without changing controllers or software.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBus: Feetech half-duplex TTL, mixes with STS3215 on the same chain\u003c\/li\u003e\n\u003cli\u003eControllers: BusLinker V3.0, Waveshare Bus Servo Adapter, FE-URT-1\u003c\/li\u003e\n\u003cli\u003eSoftware: LeRobot (feetech), Feetech SDK, Waveshare tool\u003c\/li\u003e\n\u003cli\u003eHorns: 25 T spline, same as STS3215; the C001 variant includes a metal bracket\u003c\/li\u003e\n\u003cli\u003ePower: 12 V, plan 2–3 A per servo under load\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3250 (ST-3250)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStall torque\u003c\/th\u003e\n\u003ctd\u003e50 kg·cm at 12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed\u003c\/th\u003e\n\u003ctd\u003e75 rpm at 12 V (0.13 s\/60°)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e12 V (6–12.6 V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCase\u003c\/th\u003e\n\u003ctd\u003eFull aluminium alloy, dual shaft, 25 T spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGears\u003c\/th\u003e\n\u003ctd\u003eHardened steel gear train, coreless motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEncoder\u003c\/th\u003e\n\u003ctd\u003e12-bit magnetic, 360°, multi-turn\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eFeetech half-duplex TTL bus, same protocol as STS3215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e74.5 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded\u003c\/th\u003e\n\u003ctd\u003eHorn, screws, cable; C001 adds a metal mounting bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3250-C002 (servo only):\u003c\/strong\u003e 1 × STS3250 servo, horn, screws, cable, manual\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTS3250-C001 (with metal bracket):\u003c\/strong\u003e 1 × STS3250 servo with metal U-bracket, horn, screws, cable, manual\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eDoes it fit the SO-ARM101 printed parts?\u003c\/h3\u003e\u003cp\u003eThe STS3250 is larger (about 45 × 24 × 35 mm body plus the metal case) than the STS3215, so the standard SO-101 shoulder parts need a modified pocket; several community remixes exist and our print files include an STS3250 shoulder option.\u003c\/p\u003e\u003ch3\u003eSame speed as the STS3215?\u003c\/h3\u003e\u003cp\u003eFaster: 75 rpm at 12 V versus about 45–60 rpm, with 50 kg·cm stall torque.\u003c\/p\u003e\u003ch3\u003eDo I need new software?\u003c\/h3\u003e\u003cp\u003eNo. It speaks the same Feetech protocol; set its ID and it appears alongside the STS3215 in LeRobot.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"STS3250-C002 (servo only)","offer_id":50760956379375,"sku":"STS3250-C002","price":96.0,"currency_code":"SGD","in_stock":true},{"title":"STS3250-C001 (with metal bracket)","offer_id":50760956412143,"sku":"STS3250-C001","price":102.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_760e5a8a-456c-42eb-98fc-855411612950.jpg?v=1789437226","url":"https:\/\/armdojo.com\/products\/feetech-sts3250-serial-bus-servo-50kg","provider":"ArmDojo","version":"1.0","type":"link"}