# Stepper Motor: Bipolar, 200 Steps/Rev, 57×56mm, 2.5V, 2.8 A/Phase **Type:** Product page · **SKU:** POLOLU-1474 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-57-56mm-2-5v-2-8-a-phase.html ([markdown](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-57-56mm-2-5v-2-8-a-phase.html.md)) This NEMA 23-size hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2.8 A at 2.5 V, allowing for a holding torque of 13 kg-cm (180 oz-in). > ⚠ Deal is for shelf stock only — any additional stock will be at the normal price. ## Pricing - **Price:** $203.96 (inc GST) — $185.42 AUD, exc GST ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 1 today; more stock is typically available with a 4–7 day lead time. ## 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 high-torque hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2.8 A at 2.5 V, allowing for a holding torque of 13 kg-cm (180 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. It can be controlled by a pair of suitable H-bridges (one for each coil), but Pololu recommend using an appropriately powerful [bipolar stepper motor driver](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html), such as Pololu's [High-Power Stepper Motor Driver 36v4](https://core-electronics.com.au/pololu-high-power-stepper-motor-driver-36v4.html), or Pololu's [Tic 36v4 High-Power Stepper Motor Controller](https://core-electronics.com.au/pololu-tic-36v4-usb-multi-interface-high-power-stepper-motor-controller.html). In particular, the Tic makes control easy because it supports six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and is configurable over USB with Pololu's free configuration utility. | [![](https://core-electronics.com.au/attachments/localcontent/0J6183_22306ccfa6d.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6183_2595935f0c9.jpg) | |---| | NEMA 23 stepper motor (item #1475) mounted with a steel L-bracket for NEMA 23 stepper motors. | Pololu's [1/4" universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) and [1/4" scooter wheel adapter](https://core-electronics.com.au/pololu-aluminum-scooter-wheel-adapter-for-1-4-shaft.html) can be used to mount objects on the stepper motor’s 1/4"-diameter output shaft, and Pololu carry a [NEMA 23 steel bracket](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) for securely mounting this stepper motor to a flat surface (the picture above shows this bracket being used with a taller NEMA 23 stepper motor). **Specifications** - Size: 56.4 mm square × 56 mm, not including the shaft (NEMA 23) - Weight: 0.7 kg (25 oz) - Shaft diameter: 6.35 mm (0.25") “D” - Steps per revolution: 200 - Current rating: 2.8 A per coil - Voltage rating: 2.5 V - Resistance: 0.9 O per coil - Holding torque: 13 kg-cm (180 oz-in) - Inductance: 2.5 mH per coil - Lead length: 30 cm (12") - Output shaft supported by two ball bearings More specifications are available in the datasheet (49k pdf). **Dimensions** The following diagram shows the stepper motor dimensions in mm. The output D-shaft has a 0.25" (6.35 mm) diameter with a section that is flattened by 0.5 mm (**note:** the diagram below incorrectly lists this flattened width as 6 mm when it is really 5.85 mm). This shaft works with Pololu's [1/4" universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) and [1/4" scooter wheel adapter](https://core-electronics.com.au/pololu-aluminum-scooter-wheel-adapter-for-1-4-shaft.html). | ![](https://core-electronics.com.au/attachments/localcontent/0J4739_24767120ac6.png) | |---| | [![](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 (e.g. RepRap) - Laser cutters - Pick and place machines - Linear actuators - Hard drives | [![](https://core-electronics.com.au/attachments/localcontent/0J4511_6816439839d.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4511_16633f7f040.jpg) | |---| | Pololu’s assortment of stepper motors. | **Note:** This stepper motor is SOYO part number SY57STH56-2804A. **People often buy this product together with:** | [![Pololu Universal Aluminum Mounting Hub for 1/4](https://core-electronics.com.au/attachments/localcontent/0J5002_3605ff5eca.jpg)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) | [Pololu Universal Aluminum Mounting Hub for 1/4" (6.35mm) Shaft, #4-40 Holes (2-Pack)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-1-4-shaft-4-40-holes-2-pack.html) | |---|---| | [![Stepper Motor: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase](https://core-electronics.com.au/attachments/localcontent/0J5063_3948a41661.jpg)](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-42-38mm-2-8v-1-7-a-phase.html) | [Stepper Motor: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-42-38mm-2-8v-1-7-a-phase.html) | |---|---| | [![Steel L-Bracket for NEMA 23 Stepper Motors](https://core-electronics.com.au/attachments/localcontent/0J6182_42964164ec.jpg)](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) | [Steel L-Bracket for NEMA 23 Stepper Motors](https://core-electronics.com.au/steel-l-bracket-for-nema-23-stepper-motors.html) | |---|---| **Dimensions** | Size: | 56.4 mm square × 56 mm[1](https://core-electronics.com.au/#note1) | |---|---| | NEMA size: | 23 | | Weight: | 700 g | | Shaft diameter: | 6.35 mm | **General specifications** | Shaft type: | 1/4 inch "D" | |---|---| | Current rating: | 2800 mA[2](https://core-electronics.com.au/#note2) | | Voltage rating: | 2.5 V | | Holding torque: | 180 oz·in | | Steps per revolution: | 200 | | Resistance: | 0.9 Ohm[2](https://core-electronics.com.au/#note2) | | Inductance per phase: | 2.5 mH | | Number of leads: | 4 | | Lead length: | 30 cm | **Notes:** 1Not including the shaft.2Per coil. **File downloads** - **SY57STH56-2804A stepper motor datasheet (49k pdf)** - **3D model of the SY57STH56-2804A stepper motor (Pololu item #1474) (3MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/t/stepper_motor_bipolar_200_steps_rev_57x56mm_2.5v_2.8_a_phase__pololu_1474__00.jpg)