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The Xiaomi Mijia Rotary Tool Kit is a compact cordless tool for engraving, polishing, grinding, sanding and precision drilling. Its brushless motor operates between 15,000 and 22,000RPM, while the slim 2cm pen-style body provides better control when working on small components, models, jewellery and craft materials.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Xiaomi Mijia |
| Product Type | Cordless Precision Rotary Tool Kit |
| Motor Type | Brushless Coreless Motor |
| No-Load Speed | 15,000–22,000RPM |
| Speed Control | Stepless Adjustment Knob |
| Battery | 800mAh Lithium-Ion |
| Rated Battery Voltage | 3.7V |
| Typical Runtime | At Least 60 Minutes |
| Charging Time | Approximately 90 Minutes |
| Charging Input | 5V/1A |
| Plug-In Operating Input | 5V/3A |
| Charging Port | USB Type-C |
| Accessory Shank Size | 2.35mm |
| Included Bits | 16 |
| Tool Body Material | Anodised Aluminium Alloy and Plastic |
| Storage Case Material | ABS |
| Tool Dimensions | Approximately 184 × 20 × 20.6mm |
| Kit Net Weight | Approximately 310g |
| Operating Temperature | 0–40°C |
Match the Accessory to the Project
| Included Accessory | Suitable Tasks | Compatible Materials |
|---|---|---|
| Wool Polishing Wheel | Cleaning, deburring and surface polishing | Metal, wood and plastic |
| Twist Drill Bit | Creating small precision holes | Wood and soft plastic |
| Diamond Grinding Bits | Fine carving and detailed grinding | Hard materials, glass and ceramic |
| Abrasive Grinding Bits | Rough grinding and material removal | Metal and non-metal materials |
| Rubber Grinding Heads | Fine polishing and rust removal | Metal, plastic and glass |
| Wool Grinding Heads | Mirror polishing and final finishing | Metal, glass, wood and jade |
The included accessories make the kit suitable for precision projects without requiring several separate tools. Users building a broader repair or outdoor equipment collection can also explore AS2 Multi Tools.
How Does Stepless Speed Control Help?
The rotary knob adjusts the speed continuously instead of limiting users to seven fixed levels. Starting at a lower speed provides better control on delicate materials, while higher speeds improve grinding, drilling and material removal.
| Speed Range | Recommended Tasks |
|---|---|
| Lower Speed | Polishing, cleaning and working on delicate surfaces |
| Medium Speed | Engraving, sanding and model finishing |
| Higher Speed | Grinding, drilling and faster material removal |
Users should begin at a lower speed when testing an unfamiliar material and increase the speed gradually. Excessive pressure can stall the tool, damage the accessory or mark the workpiece.
Can the Rotary Tool Work While Plugged In?
Yes. The tool can operate from its internal battery or while connected to a suitable 5V/3A power source. When it is used while plugged in, battery charging pauses and resumes after the tool is switched off.
The battery provides at least 60 minutes of average use under controlled conditions and requires approximately 90 minutes for charging. Compatible AS2 Power Banks can provide portable power when they support the required USB output.
Xiaomi Mijia Rotary Tool vs HOTO SNAPBLOQ R-A04
| Feature | Xiaomi Mijia Rotary Tool | HOTO SNAPBLOQ R-A04 |
|---|---|---|
| Motor | Brushless Coreless Motor | Brushless Motor |
| Speed Range | 15,000–22,000RPM | 15,000–22,000RPM |
| Speed Adjustment | Stepless | Stepless |
| Cordless Runtime | At Least 60 Minutes | Up to Approximately 30 Minutes |
| Accessory Package | 16 Bits | 38-Piece Accessory Set |
| Plug-In Operation | Supported | Supported |
| Best For | Longer sessions and straightforward precision work | Users prioritising a larger accessory collection |
The Xiaomi kit offers longer cordless operation and a compact collection of essential bits. The HOTO SNAPBLOQ R-A04 Electric Mini Rotary Tool Kit is better suited to buyers who want a larger 38-piece accessory package.
Who Is This Tool Best For?
| Recommended For | Not Designed For |
|---|---|
| Model builders and craft creators | Heavy construction work |
| Jewellery and decorative projects | Cutting thick steel sections |
| Fine polishing and engraving | High-torque industrial grinding |
| 3D-printed model finishing | Large drilling applications |
| Small repairs and deburring | Continuous commercial workshop use |
This is a low-power precision rotary tool rather than a replacement for a full-size workshop grinder or drill. It performs best when used for detailed tasks with light and controlled pressure.
Safety and Maintenance
- Install each accessory fully into the 2.35mm chuck and tighten it securely.
- Wear suitable eye protection when grinding, drilling or polishing.
- Use a dust mask when the material produces fine particles.
- Do not apply excessive pressure or force the accessory into the workpiece.
- Allow the tool to cool after its automatic ten-minute protection shutdown.
- Clean metal dust from the body and USB-C port after use.
- Remove the accessory before placing the tool inside its case.
What Is Included in the Box?
The package includes one Mijia Rotary Tool Pen, one ABS storage case, 16 accessories, one USB charging cable and one user manual. The case uses a lifting compartment that raises the accessories when opened for easier selection.
FAQ
1. What is the maximum speed of the Xiaomi Mijia Rotary Tool?
The brushless motor reaches a maximum no-load speed of approximately 22,000RPM.
2. Does the rotary tool have seven speed levels?
No. It uses a stepless adjustment knob that changes the speed continuously between approximately 15,000 and 22,000RPM.
3. How long does the battery last?
The 800mAh battery provides at least 60 minutes of average use under Xiaomi test conditions. Runtime varies with speed, pressure and material.
4. Can the tool be operated while connected to power?
Yes. Plug-in operation requires a suitable 5V/3A power source. The battery resumes charging after the tool is switched off.
5. What accessory size is compatible with the tool?
The chuck supports included or third-party accessories with a 2.35mm shank.
6. Can the tool drill holes?
Yes. Xiaomi states that it can create holes approximately 1.3–1.4mm in diameter when used with the suitable drill bit and material.
7. Is the Xiaomi Mijia Rotary Tool suitable for beginners?
Yes. It has a single power button, stepless speed knob and wrench-free accessory installation. Beginners should practise on scrap material before working on valuable objects.
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