Coreless motor, metal gearbox in a plastic case, 12-bit magnetic encoder and FEETECH TTL serial-bus control board with multi-turn 360° position modes
Motion & Actuation · TTL networked smart servo actuator
ST-3215-C001
This record freezes the 7.4 V-class variant ST-3215-C001 of the STS3215 family and preserves the official page’s voltage wording exactly: the title and description market the servo as “7.4V 19KG”, while the specification table states an operating voltage range of 6-7.4V and attaches its only stall-torque figure, 19.5kg.cm, to 6V. RCI does not resolve this internal tension (documented voltage-conflict note RCI 049). The 12 V variant ST-3215-C018 is a separate record.
FEETECH ST-3215-C001 · Also: STS3215, 7.4V 19KG.CM magnetic encoding servo STS3215, 7.4V 19KG. Dual axis TTL string servo
11 known suppliers in this product family.
Motor, reduction, feedback and drive electronics sold as an integrated or near-integrated robot-joint product. The list is bounded to the current RCI manufacturer-directory universe and separates exact-model audited suppliers from confirmed product-line suppliers.
EXACT-MODEL AUDITED
8 suppliers
HEBI Robotics · ROBOTIS · CubeMars · MYACTUATOR · Unitree Robotics · mjbots · FEETECH · Damiao
PRODUCT-LINE CONFIRMED
3 suppliers
INNFOS · MAB Robotics · Synapticon
This is a bounded discovery set, not a claim to enumerate every company worldwide. Open the full supplier landscape and official routes →
What this record can support today.
Coverage is computed from published, non-unknown fields. It measures the record—not product quality—and makes missing procurement evidence explicit.
Engineering field coverage73%
8 of 11 selected fields published
- Official product sourcepublished
- Lifecycle statepublished
- Mechanical dimensions / mass / mountingpublished
- Environmental operating limitspublished
- Continuous or rated outputpublished
- Peak / momentary outputmissing
- Speed boundarypublished
- Transmission ratio / errorunknown
- Electrical input / consumptionpublished
- Control and communication interfacemissing
- Position / torque feedbackpublished
Procurement field coverage15%
2 of 13 selected fields published
- Official product / sales routepublished
- Lifecycle statepublished
- Exact orderable SKU / part numbermissing
- Price with region, currency and quantitymissing
- Lead time with check datemissing
- Commercial availability / stock statemissing
- Minimum order quantitymissing
- Authorized distributor / sales channelmissing
- CAD / STEP / interface drawingmissing
- Certification with identifiermissing
- MTBF / failure / reliability datamissing
- Warranty termsmissing
- PCN / EOL / replacement noticemissing
Coverage measures whether a selected public field is present with non-U evidence. It is not a product score, compatibility result, certification, availability confirmation or procurement recommendation. Download the complete readiness coverage JSON →
Reported values, conditions attached.
Evidence state describes the claim—not the prestige of the company or document.
| Claim | Reported value | Condition / boundary | State | Source |
|---|---|---|---|---|
| Exact model and family titlemodel_identity | ST-3215-C001; page title “7.4V 19KG.CM magnetic encoding servo STS3215” | The page mixes the order code ST-3215-C001 with the family name STS3215; this record freezes the C001 order code. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Operating voltageinput_voltage | 6-7.4V | Transcribed exactly from the row “工作电压Operating Voltage Range: 6-7.4V”. The page title and description simultaneously describe the servo as a “7.4V 19KG” serial bus smart servo.Voltage-conflict note RCI 049: the marketing designation is 7.4 V, the published range is 6-7.4 V, and all tabulated performance points are conditioned at 6 V. RCI preserves all three statements without resolving them. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Peak stall torqueheadline_torque | 19.5kg.cm@6V | Momentary stall endpoint, published as “堵转扭矩 Peak stall torque: 19.5kg.cm@6V”; not a continuous operating point. The description separately states “The stall torque is 19kg.cm” without a voltage qualifier. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Rated torquerated_torque | 6.5kg.cm@6V | Published as “额定扭矩 Rated torque”; the page does not define rated torque as a thermally qualified continuous duty point. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| No-load speedspeed | 0.238sec/60°@6V | No-load endpoint; it cannot be combined with stall torque. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Stall and no-load currentcurrent | Stall 2000mA@6V; no-load 150 mA@6V | Published endpoints at 6 V. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Weightmass | 55±1 g | Manufacturer specification. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Dimensionsdimensions | 45.2 × 24.7 × 35 mm | Published as A/B/C body dimensions. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Position sensor and resolutionencoder | 12 bit high precision magnetic coding sensor; 360° mapped to 0–4096 | Manufacturer specification; multi-turn continuous rotation and stepping modes are listed. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Physical communicationcommunications | Half-duplex asynchronous serial (TTL bus); 38400bps ~ 1 Mbps | Bus protocol, IDs and host adapter must still be fixed for one robot. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Operating temperatureoperating_temperature | −20 to +70 °C | Published device range; not a thermal duty envelope. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Gear material and casegear_material | Copper gears; metal gearbox in plastic case; 25T horn spline | Manufacturer specification; the 12 V C018 variant instead lists steel gears. | M · Manufacturer claimed | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Numeric gear reduction ratiogear_ratio | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.The cited official product page does not publish a numeric reduction ratio for the C001 variant; the widely circulated 1:345 figure is not stated on this page and is therefore not carried as manufacturer evidence. | U · Unknown | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Continuous or thermally rated output torquecontinuous_torque | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.The cited official evidence publishes stall and rated torque values at 6 V but no continuous or thermally rated torque envelope, duty-cycle limit, cooling condition or allowable stall duration. | U · Unknown | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Independent exact-actuator robot validationindependent_robot_validation | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.RCI has not received, serialised, loaded, thermally instrumented or endurance-tested an ST-3215-C001. | U · Unknown | FEETECH 7.4V 19KG.CM magnetic encoding servo STS3215 (ST-3215-C001) product page ↗Bilingual product description and specification table · Live official product page observed 2026-08-18 Checked 2026-08-19 |
Known limits
What this record does not prove.
- The official page carries an internal voltage tension: “7.4V 19KG” marketing designation, a 6-7.4V operating range, and torque/speed/current figures conditioned only at 6 V; RCI preserves all statements verbatim and does not interpolate 7.4 V performance.
- ST-3215-C001 (6-7.4 V, copper gears) and ST-3215-C018 (12 V-class, steel gears) are separate order codes and are never merged into one record.
- Stall torque, no-load speed and stall current are opposite endpoints and must not be presented as continuous operating points.
- No serialised specimen, RCI torque test or thermal test exists for this record.