Coreless motor, steel-gear 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-C018
This record freezes the 12 V-class variant ST-3215-C018 of the STS3215 family as a separate record from the 7.4 V-class ST-3215-C001, demonstrating the variant-split rule. The official page markets the servo as “12V 30KG” while its specification table states an operating voltage range of 4-14V; RCI preserves both statements without resolving them.
FEETECH ST-3215-C018 · Also: STS3215, 12V 30KG.CM magnetic encoding servo STS3215, 12V 30KG. 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 coverage82%
9 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 / errorpublished
- 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 →
1 bounded physical-evidence record.
Publisher independence, identity precision and measurement scope vary by row. Results remain bounded by the disclosed specimen, setup, workload and metric; an inconclusive mapping is evidence associated with the catalog model, not verification of a manufacturer claim.
| Measured result | Conditions | Claim mapping | Source |
|---|---|---|---|
| Independent direct-component measurementindependent_physical_evidence | Backlash, repeatability, torque and thermal behavior were physically testedIndependent bench article identifies C018; some comparison images use a similar Waveshare unit. | inconclusiveThe record establishes bounded physical evidence for the named model, but the experiment does not reproduce the catalogued claim metric and conditions; the claim remains inconclusive. | Testing of Feetech STS3215 servomotor: backlash, repeatability and torque ↗Bench setup and result tables Checked 2026-08-26 |
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-C018; page title “12V 30KG.CM magnetic encoding servo STS3215” | The page mixes the order code ST-3215-C018 with the family name STS3215; this record freezes the C018 order code. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Operating voltageinput_voltage | 4-14V | Transcribed exactly from the row “工作电压Operating Voltage Range: 4-14V”. The page title and description simultaneously describe the servo as a “12V 30KG” serial bus smart servo, and all tabulated performance points are conditioned at 12 V.Companion to voltage-conflict note RCI 049: the marketing designation (12 V) and the published range (4-14V) are both preserved verbatim. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Peak stall torqueheadline_torque | 30kg.cm@12V | Momentary stall endpoint published as “堵转扭矩 Peak stall torque”; not a continuous operating point. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Rated torquerated_torque | 10kg.cm@12V | 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 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| No-load speedspeed | 0.222sec/60°@12V | No-load endpoint; it cannot be combined with stall torque. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Stall and no-load currentcurrent | Stall 2.7A@12V; no-load 180 mA@12V | Published endpoints at 12 V. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Weightmass | 55±1 g | Manufacturer specification. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · 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 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · 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 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Physical communicationcommunications | Half-duplex asynchronous serial (TTL bus); 38400bps ~ 1 Mbps; ID range 0-253 | Bus protocol, IDs and host adapter must still be fixed for one robot. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Operating temperatureoperating_temperature | −20 to +60 °C | Published device range; note the C001 variant instead lists −20 to +70°C. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Gear material and casegear_material | Steel gears; metal gearbox in plastic case; 25T/OD5.9mm horn | Manufacturer specification; the 7.4 V-class C001 variant instead lists copper gears. | M · Manufacturer claimed | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
| Gear reduction ratiogear_ratio | 1/345 | Published as item 6-10 “减速比 Gear Ratio 1/345” in the ST-3215-C018.pdf datasheet linked from the official product page; the product-page table itself does not state the ratio. | M · Manufacturer claimed | FEETECH ST-3215-C018 datasheet (ST-3215-C018.pdf) ↗Specification table item 6-10, gear ratio row 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 12 V but no continuous or thermally rated torque envelope, duty-cycle limit, cooling condition or allowable stall duration. | U · Unknown | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · 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-C018. | U · Unknown | FEETECH 12V 30KG.CM magnetic encoding servo STS3215 (ST-3215-C018) product page ↗Bilingual product description, specification table and linked ST-3215-C018.pdf datasheet · Live official product page observed 2026-08-18 Checked 2026-08-19 |
Known limits
What this record does not prove.
- The official page markets a 12 V servo while its specification table publishes a 4-14V operating range; RCI preserves both statements verbatim and does not certify performance across that range.
- ST-3215-C018 and ST-3215-C001 are separate order codes with different voltage classes, gear materials and temperature ranges; they 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.