> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Stepper Motor: Bipolar, 200 Steps/Rev, 20×42mm, 4.3V, 0.8 A/Phase **Type:** Product page · **SKU:** POLOLU-2256 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-42mm-4-3v-0-8-a-phase.html ([markdown](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-42mm-4-3v-0-8-a-phase.html.md)) This small NEMA 8-size hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 800 mA at 4.3 V, allowing for a... ## Pricing - **Price:** $124.95 (inc GST) — $113.59 AUD, exc GST - **Quantity discounts:** 5+ $109.05 (exc GST) · 10+ $105.64 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 31 and Sep 01. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-2256:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-2256:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description | [![](https://core-electronics.com.au/attachments/localcontent/0J2286_1892927f0cd.jpg)](https://core-electronics.com.au/attachments/localcontent/0J2286_1641576afb9.jpg) | |---| | Bipolar stepper motor wires are terminated with bare leads. | | ![](https://core-electronics.com.au/attachments/localcontent/0J2296_2723a56f97.gif) | |---| | Bipolar stepper motor wiring diagram. | This small hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 800 mA at 4.3 V, allowing for a holding torque of 300 g-cm (4.2 oz-in). The motor has four color-coded wires terminated with bare leads: black and green connect to one coil; red and blue connect to the other. These leads connect to the stepper motor through a removable JST-ZHR-5 connector. The motor can be controlled by a pair of suitable H-bridges (one for each coil), but Pololu recommend using a [bipolar stepper motor driver](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html) or one of Pololu's [Tic Stepper Motor Controllers](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html). In particular, the Tics make control easy because they support six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and are configurable over USB with Pololu's free configuration utility. Pololu's [4 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-4mm-shaft-4-40-holes-2-pack.html) can be used to mount objects on the stepper motor’s 4 mm-diameter output shaft. For a slightly less powerful motor in the same NEMA size but a shorter length, consider [Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html). A comparison between these two motors can be seen in the image below. | [![](https://core-electronics.com.au/attachments/localcontent/0J11420_182436abd35.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11420_53692f64bf8.jpg) | |---| | [SY20STH30-0604A](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html) (top) and [SY20STH42-0804A](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-42mm-4-3v-0-8-a-phase.html) (bottom). | **Specifications** - Size: 20 mm square × 42 mm, not including the shaft (NEMA 8) - Weight: 80 g (2.8 oz) - Shaft diameter: 4 mm “D” - Steps per revolution: 200 - Current rating: 800 mA per coil - Voltage rating: 4.3 V - Resistance: 5.4 O per coil - Holding torque: 300 g-cm (4.2 oz-in) - Inductance: 1.5 mH per coil - Lead length: 30 cm (12") - Output shaft supported by two ball bearings More specifications are available in the [datasheet](https://core-electronics.com.au/attachments/localcontent/SY20STH42-0804A_2826660405d.pdf) (28k pdf). **Dimensions** The following diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 30 mm. The output D-shaft has a length of 15 mm and a 4 mm diameter with a section that is flattened by 0.5 mm. This shaft works with Pololu's [4 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-4mm-shaft-4-40-holes-2-pack.html). | ![](https://core-electronics.com.au/attachments/localcontent/0J11421_282403dc219.jpg) | |---| | [![](https://core-electronics.com.au/attachments/localcontent/0J2297_3186898a777.jpg)](https://core-electronics.com.au/attachments/localcontent/0J2297_246528185f4.jpg) | |---| | The inside of a bipolar stepper motor (SOYO NEMA 14-size). | **Stepper Motor Applications** Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found: - Printers - CNC machines - 3D printer/prototyping machines - Laser cutters - Pick and place machines - Linear actuators - Hard drives | ![](https://core-electronics.com.au/attachments/localcontent/0J4511_6816439839d.jpg) | |---| | Pololu’s assortment of stepper motors. | **Note:** This stepper motor is SOYO part number SY20STH42-0804A. **People often buy this product together with:** | [![Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)](https://core-electronics.com.au/attachments/localcontent/0J1106_30989f4660.jpg)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-4mm-shaft-4-40-holes-2-pack.html) | [Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-4mm-shaft-4-40-holes-2-pack.html) | |---|---| | [![Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase](https://core-electronics.com.au/attachments/localcontent/0J2280_32574cb22f.jpg)](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html) | [Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html) | |---|---| | [![Stepper Motor: Bipolar, 200 Steps/Rev, 28×45mm, 4.5V, 0.67 A/Phase](https://core-electronics.com.au/attachments/localcontent/0J2282_3184112e7b.jpg)](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-45mm-4-5v-0-67-a-phase.html) | [Stepper Motor: Bipolar, 200 Steps/Rev, 28×45mm, 4.5V, 0.67 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-45mm-4-5v-0-67-a-phase.html) | |---|---| **Dimensions** | Size: | 20 mm square × 42 mm[1](https://core-electronics.com.au/#note1) | |---|---| | NEMA size: | 8 | | Weight: | 80 g | | Shaft diameter: | 4 mm | **General specifications** | Shaft type: | 4 mm "D" | |---|---| | Current rating: | 800 mA[2](https://core-electronics.com.au/#note2) | | Voltage rating: | 4.3 V | | Holding torque: | 4.2 oz·in | | Steps per revolution: | 200 | | Resistance: | 5.4 Ohm[2](https://core-electronics.com.au/#note2) | | Inductance per phase: | 1.5 mH | | Number of leads: | 4 | | Lead length: | 30 cm | **Notes:** 1Not including the shaft.2Per coil. **File downloads** - **[SY20STH42-0804A stepper motor datasheet](https://core-electronics.com.au/attachments/localcontent/SY20STH42-0804A_2826660405d.pdf) (28k pdf)** - **3D model of the SY20STH42-0804A stepper motor (Pololu item #2256) (3MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_11987.jpg)