Precision positioning (CNC, 3D printers, camera sliders)
Open-loop positioning: 11.25° steps, 1.5 N·cm holding torque.
Engineering inference
Adafruit Industries
28BYJ-48 5 V Geared Stepper (1/16)
28BYJ-48 5 V unipolar geared stepper (Adafruit 858): 32 steps (11.25°) × 1/16.128 gearbox = 516 steps per output revolution, ~42 Ω per winding, 150 gf·cm (15 N·mm) holding torque, ~6 RPM at 5 V, Ø28 × 19 mm can with two Ø4.2 mm ears on 35 mm centres, Ø5 mm flatted shaft, 5-wire JST XH lead (23 cm), 37 g. The cheapest stepper to learn on.
28BYJ-48MotorPrice$4.95www.adafruit.com · in stock
Buy at www.adafruit.com Overview
Motor essentials
Facts about the complete product. Unknown values remain open design questions.
- Rated voltage
- 5 V
- Gear reduction
- 16.128:1
- Shaft diameter
- 5 mm
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)
- 42 × 28 × 29 mm
- Verification
- generated
- Envelope complete
- No — some heights assumed
ear_thickness=1.0 mm assumed: ear plate thickness not dimensioned on the drawing; 1 mm assumed for the CAD envelope only
Mechanical interface
Mechanical output interface
The motor body, transmission and output shaft have separate roles in a mechanism.
- Motor type
- stepper
- Gear reduction
- 16.128:1
- Shaft diameter
- 5 mm
- Body diameter
- 28 mm
- Body length
- 19 mm
- Phases
- 2
- Step angle
- 11.25 °
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
- 5 V
- Rated current
- 0.12 A
- Holding torque
- 0.01471 N·m
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
- 42 mm
- Width
- 28 mm
- Reported height / thickness
- 29 mm
- Mounting hole records
- 2
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 |
|---|---|---|---|
| leads5-wire lead, AWG26, 0.1 in (2.54 mm) 5-pin JST XHP-5 housing, ~23 cm | 5 | 2.54 mm | — |
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.adafruit.com
US · USD
$4.95Minimum quantity unknown
- Observed stock
- in stock
- Checked
- Oct 1, 2026, 07:28 AM 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
28BYJ-48 5 V stepper (Adafruit 858) — label shows STEP MOTOR 28BYJ-48 5V DC (opens in a new tab)
Manufacturer reference
inspected: can label reads STEP MOTOR 28BYJ-48 5V DC, blue cable gland, 5-pin white JST housing
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.assumptions, 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.gear_ratio, spec.provides.holding_torque_nm, spec.provides.motor_type, spec.provides.other.steps_per_rev, spec.provides.output_type, spec.provides.step_angle_deg, spec.usage.connectors, spec.usage.pinout, spec.usage.pinout_complete, spec.usage.requirements.driver_required, spec.usage.requirements.other.winding_resistance_ohm, spec.usage.requirements.phases, spec.usage.requirements.rated_current_a, spec.usage.requirements.rated_voltage_v
sha256 8cff649bf27b7d313b33c5f867d9b87d331d73c80934d013721da0066b575de2
Supports: offers
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FAQ
28BYJ-48 5 V Geared Stepper (1/16) questions
How much does the 28BYJ-48 5 V Geared Stepper (1/16) cost?
From $4.95 at www.adafruit.com. Prices are observed unit prices before tax and shipping.
What are the 28BYJ-48 5 V Geared Stepper (1/16) dimensions?
42 × 28 × 29 mm. A STEP model is available for enclosure fit checks.
Where does this 28BYJ-48 5 V Geared Stepper (1/16) 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.
Sources
- 28BYJ-48 5 V Geared Stepper (1/16) datasheet — Adafruit Industries
- www.adafruit.com listing