> **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 # 40kg.cm Metal Serial Bus Servo **Type:** Product page · **SKU:** WS-24702 · **Brand:** [Waveshare](https://core-electronics.com.au/brands/waveshare-in-australia) **Page:** https://core-electronics.com.au/40kg-metal-serial-bus-servo.html ([markdown](https://core-electronics.com.au/40kg-metal-serial-bus-servo.html.md)) 40kg.cm Metal Serial Bus Servo, Wide Range Voltage, High Precision And Large Torque, With Programmable 360 Degrees Magnetic Encoder and Brushless Motor,... ## Pricing - **Price:** $134.95 (inc GST) — $122.68 AUD, exc GST - **Quantity discounts:** 5+ $117.77 (exc GST) · 10+ $114.09 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 31 and Sep 07. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=WS-24702:1` (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/WS-24702:1.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 40kg.cm Metal Serial Bus Servo, Wide Range Voltage, High Precision And Large Torque, With Programmable 360 Degrees Magnetic Encoder and Brushless Motor, Two-Way Feedback, Servo/Motor Mode Switchable 40kg.cm metal serial bus servo Metal case, with Brushless Motor and 360° Programmable Magnetic Encoder ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-1_14850d22934.jpg) Specifications | **Product type** | ST3025 serial bus servo | |---|---| | **Torque** | 40kg.cm@12V | | **Rotation angle** | 360° (0~4095) | | **Position sensor resolution** | 0.088° (360°/4096) | | **Mechanism limit angle** | No Limit | | **Working voltage** | 6 ~ 12.6 V (typ. 12V) | | **Gear** | high precision steel gear | | **No-load speed** | 0.117sec/60° (85RPM) | | **Encoder type** | 12Bits magnetic encoder | | **ID range** | 1 ~ 253 | | **Baudrate** | 38400bps ~ 1Mbps (1Mbps by default) | | **No-load current** | 380mA | | **Locked-rotor current** | 4.4A | | **Kt** | 9kg.cm/A | | **Feedback** | Position, Load, Speed, Input Voltage, Current, Temperature | Application Examples - Servos will provide various feedback like load, position, speed, input voltage, working current, working mode (servo mode, servo motor mode, etc.) for advanced projects requiring closed-loop automatic control. - Ideal choice for building quadruped robots, hexapod walkers, robotic arms and other robotic projects requiring multiple servos. (This product provides the open source models as shown in the picture below) ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-3-1_276390736c2.jpg)**Download models:** [![](https://core-electronics.com.au/attachments/localcontent/icon-STEP_1568ca4a64.png)](https://core-electronics.com.au/attachments/localcontent/CLAWER-6_based_on_ST3025_STEP_265182b5bd8.zip) [![](https://core-electronics.com.au/attachments/localcontent/icon-F3Z_1501ac439b.png)](https://core-electronics.com.au/attachments/localcontent/CLAWER-6_based_on_ST3025_F3Z_60426854565.zip) ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-3-2_23737d2876d.jpg)**Download models:** [![](https://core-electronics.com.au/attachments/localcontent/icon-STEP_1568ca4a64.png)](https://core-electronics.com.au/attachments/localcontent/CLAWER-4_based_on_ST3025_STEP_262530f6c3c.zip) [![](https://core-electronics.com.au/attachments/localcontent/icon-F3Z_1501ac439b.png)](https://core-electronics.com.au/attachments/localcontent/CLAWER-4_based_on_ST3025_F3Z_5947446c7a2.zip) ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-3-3_181174c99cd.jpg)**Download models:** [![](https://core-electronics.com.au/attachments/localcontent/icon-STEP_1568ca4a64.png)](https://core-electronics.com.au/attachments/localcontent/PT_based_on_ST3025_STEP_32960b5ebc4.zip) [![](https://core-electronics.com.au/attachments/localcontent/icon-F3Z_1501ac439b.png)](https://core-electronics.com.au/attachments/localcontent/PT_based_on_ST3025_F3Z_1050249e24d.zip) ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-3-4_16593f10d7a.jpg)**Download models:** [![](https://core-electronics.com.au/attachments/localcontent/icon-STEP_1568ca4a64.png)](https://core-electronics.com.au/attachments/localcontent/ARM_based_on_ST3025_STEP_367076a30e1.zip) [![](https://core-electronics.com.au/attachments/localcontent/icon-F3Z_1501ac439b.png)](https://core-electronics.com.au/attachments/localcontent/ARM_based_on_ST3025_F3Z_13424a8544b.zip) \* images here are for reference ONLY UART Serial Bus Control Allows controlling up to 253 serial bus servos at the same time ![](https://core-electronics.com.au/attachments/localcontent/ST3025-Servo-details-5_67575a596d6.jpg)Note: though one channel UART can control up to 253 serial bus servos, due to the high power of the servos, it is necessary to consider whether the power supply solution is enough when using too many servos. For reference only, the ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/W/S/WS-24702-1.jpg)