Mobile robot drive trains
50.9:1 planetary gearmotor, 117 rpm no-load with an output-shaft encoder for closed-loop drive or arm joints.
Engineering inference
goBILDA
goBILDA Yellow Jacket 50.9:1 Gearmotor
goBILDA 5203-2402-0051 Yellow Jacket is a 12 V RS-555 brushed DC planetary gearmotor with 50.9:1 steel gearing, 117 rpm no-load output speed, 68.4 kg cm stall torque (9.2 A), 8 mm REX output shaft, 125.1 mm long, 483 g, and a 3.3 to 5 V magnetic quadrature encoder rated at 1,425.1 PPR at the output shaft.
5203-2402-0051MotorPrice$54.99www.gobilda.com · in stock
Buy at www.gobilda.com Overview
Motor essentials
Facts about the complete product. Unknown values remain open design questions.
- Rated voltage
- 12 V
- No-load speed
- 117 RPM
- Stall torque
- 6.70775 N·m
- Gear reduction
- 50.9:1
- Shaft diameter
- 8 mm
- Encoder
- relative magnetic Hall-effect quadrature encoder, 1425.1 PPR at output shaft
A good fit for
Guidance to help you shortlist. The basis is shown for each recommendation.
No-load speed, rated performance and stall limits describe different operating points. A stall specification is not a continuous operating rating.
3D model & CAD
3D model & CAD files
Generated from the datasheet's dimensioned drawing and measured against it. Download the STEP to check fit in your own enclosure.
- Envelope (L × W × H)
- 37.5 × 37.5 × 148.6 mm
- Verification
- generated
- Envelope complete
- Yes
Mechanical interface
Mechanical output interface
The motor body, transmission and output shaft have separate roles in a mechanism.
- Motor type
- gearmotor
- Gear reduction
- 50.9:1
- Shaft diameter
- 8 mm
- Body diameter
- 37.5 mm
- Body length
- 125.1 mm
- Encoder
- relative magnetic Hall-effect quadrature encoder, 1425.1 PPR at output shaft
Reported body dimensions may exclude the shaft, terminals and other protrusions. Use the manufacturer drawing to establish the complete mounting and clearance envelope.
Specifications
Motor performance
No-load, rated-load and stall figures retain their separate test conditions.
- Rated voltage
- 12 V
- No-load speed
- 117 RPM
- No-load current
- 0.25 A
- Stall torque
- 6.70775 N·m
- Stall current
- 9.2 A
Stall torque and current are not continuous ratings. Check the duty cycle and starting load when choosing the driver and power supply.
Thermal limits by level
Product operating conditions, chip ambient ratings, package case limits and junction maxima remain separate.
Motor body
Mechanical dimensions
Reported product dimensions may exclude protruding components. Unknown height does not establish a complete clearance envelope.
- Length
- 37.5 mm
- Width
- 37.5 mm
- Reported height / thickness
- 148.6 mm
- Mounting hole records
- 8
Attached generated geometry is an approximate envelope. A generated outline does not establish an electrically verified PCB footprint.
Board connectors
| ID / type | Pins | Pitch | Notes |
|---|---|---|---|
| motor3.5 mm FH-MC bullet connectors, 470 mm of 18 AWG wire | 2 | Unknown | — |
| encoder4-position JST XH [FH-MC] encoder connector | 4 | Unknown | — |
Complete structured record
Every available field, including details beyond the summaries. Null means the value has not been established.
Sourcing & files
Supplier offers
US / USD is the target market. Observed price and stock are separate from a delivery quote.
www.gobilda.com
US · USD
$54.99Minimum quantity unknown
- Observed stock
- in stock
- Checked
- Oct 1, 2026, 05:06 PM UTC
- Delivery estimate
- Not quoted
Observed within the last 24 hours. Confirm the current supplier quote.
Visit supplier (opens in a new tab)Delivery depends on quantity, postal code and shipping method. A dispatch statement such as “ship today” is not an arrival estimate.
Design files and references
Each source keeps its own verification status. Confirm the part revision and file contents before using it in a design.
Datasheet (opens in a new tab)
Manufacturer reference
goBILDA 5203-2402-0051 Yellow Jacket gearmotor (opens in a new tab)
Manufacturer reference
main image (og:image) of the 5203-2402-0051 product page
STEP (generated from datasheet drawing) — link unavailable
Generated asset
cad_check passed
Generated envelope geometry may also exist for this record. It does not replace manufacturer CAD or a verified electrical land pattern.
Source evidence
Document provenance, retrieval dates and the field groups supported by each source.
Supports: spec.constraints.electrical.supply_voltage_nominal_v, spec.geometry.body_diameter_mm, spec.geometry.body_length_mm, 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.mounting_holes, spec.geometry.other.weight_g, spec.geometry.shaft_diameter_mm, spec.geometry.shaft_extension_mm, spec.provides.features, spec.provides.feedback, spec.provides.gear_ratio, spec.provides.motor_type, spec.provides.no_load_speed_rpm, spec.provides.output_type, spec.provides.stall_torque_nm, spec.usage.connectors, spec.usage.pinout, spec.usage.pinout_complete, spec.usage.requirements.no_load_current_a, spec.usage.requirements.rated_voltage_v, spec.usage.requirements.stall_current_a
sha256 d8f6eab7924ccce00f801f86e95e005d465811a38b62584ff11a41f1e52c8d84
Supports: offers
FAQ
goBILDA Yellow Jacket 50.9:1 Gearmotor questions
How much does the goBILDA Yellow Jacket 50.9:1 Gearmotor cost?
From $54.99 at www.gobilda.com. Prices are observed unit prices before tax and shipping.
What are the goBILDA Yellow Jacket 50.9:1 Gearmotor dimensions?
37.5 × 37.5 × 148.6 mm. A STEP model is available for enclosure fit checks.
Where does this goBILDA Yellow Jacket 50.9:1 Gearmotor data come from?
Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.