Introduction
The Redragon K631 Castor is a compact 65% wired RGB mechanical gaming keyboard designed for performance and customization. Featuring 68 keys, 100% hot-swappable sockets, and quiet red switches, it offers a responsive and personalized typing experience. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your keyboard.

Image: The Redragon K631 Castor keyboard, showcasing its compact 65% layout, full hot-swap functionality, and modding potential with extra keycaps and software.
Setup
To set up your Redragon K631 Castor keyboard, follow these simple steps:
- Unpack: Carefully remove the keyboard and its accessories from the packaging.
- Connect: Plug the included USB-C cable into the keyboard's USB-C port and the other end into an available USB port on your computer or gaming console.
- Driver Installation: The keyboard is plug-and-play for basic functionality. For advanced customization and software features, download the Redragon Pro Software from the official Redragon website.
- Placement: Position the compact 65% layout keyboard on your desk for optimal comfort and gaming space.

Image: A size comparison illustrating the compact 65% form factor of the Redragon K631 Castor (12.2 inches long) next to a standard 104-key keyboard, highlighting its space-saving design.
Operating Instructions
RGB Lighting Control
The Redragon K631 features vibrant RGB backlighting with multiple modes and customization options:
- Change Lighting Patterns: Press Fn + Page Down to cycle through 20 preset backlighting modes.
- Change Lighting Colors: After selecting a pattern, press Fn + Right Arrow Key to change the color of the current pattern.
- Adjust Brightness: Use Fn + Up Arrow Key to increase brightness and Fn + Down Arrow Key to decrease brightness.
- Adjust Flowing Speed: Use Fn + Left Arrow Key to decrease speed and Fn + Right Arrow Key to increase speed for dynamic lighting effects.
- Music Sync Mode: Activate the marvelous music sync mode for an immersive light show.

Image: The Redragon K631 Castor keyboard illustrating the dedicated arrow keys and additional function keys for Home, End, Print Screen (PrtSc), and Insert, accessible via the Fn key.
Pro Software Support
Utilize the Redragon Pro Software to expand your customization options. This software allows you to:
- Design your own lighting modes and effects.
- Create macros with different keybindings or shortcuts for efficient work and gaming.

Image: The Redragon K631 Castor keyboard with a transparent overlay of its professional software interface, demonstrating the extensive DIY customization options available for lighting and key functions.
Video Demonstration: Keycap & RGB Customization
Video: This video demonstrates how to change keycaps and switches, and showcases various RGB lighting patterns and colors on the Redragon K631 keyboard. It also shows how to adjust brightness and cycle through different lighting effects using keyboard shortcuts.
Maintenance
Hot-Swappable Switches
The Redragon K631 features 100% hot-swappable sockets, allowing you to easily change switches without soldering. This enables customization and replacement of faulty switches.
- Removing Keycaps: Use the included keycap puller tool to gently remove keycaps.
- Removing Switches: Use the included switch puller tool to carefully extract the mechanical switches from the PCB. The unique exclusive structure design of the socket makes switch mounting easier and reduces wobbling.
- Installing New Switches: Align the pins of the new 3-pin or 5-pin switch with the holes on the PCB and press down firmly until it clicks into place. Ensure pins are not bent.
- Installing Keycaps: Place the desired keycap over the switch stem and press down until it is securely attached.

Image: A close-up view of the Redragon K631 Castor's hot-swappable sockets with quiet red linear switches, showing the plate-mounted PCB and compatibility with 3/5-pin switches. Key specifications like 2.0mm travel distance, 40g actuation force, and 50M click lifespan are highlighted.
Cleaning
Regular cleaning helps maintain keyboard performance and appearance:
- Dust Removal: Use compressed air to remove dust and debris from between keycaps.
- Keycap Cleaning: For deeper cleaning, remove keycaps and wash them with mild soap and water. Ensure they are completely dry before reattaching.
- Surface Cleaning: Wipe the keyboard surface with a soft, damp cloth. Avoid harsh chemicals.
Troubleshooting
- Keyboard Not Responding: Ensure the USB-C cable is securely connected to both the keyboard and the computer. Try a different USB port or cable.
- RGB Lights Not Working: Check the lighting controls (Fn + Page Down, Fn + Arrow Keys) to ensure a mode is selected and brightness is up. If using software, verify settings.
- Specific Keys Not Working: If a specific key is unresponsive, it might be a faulty switch. Utilize the hot-swap feature to replace the switch. Refer to the Maintenance section for instructions.
- Software Issues: Ensure you have the latest version of the Redragon Pro Software. Reinstalling the software may resolve conflicts.
Specifications
| Feature | Detail |
|---|---|
| Brand | Redragon |
| Model Number | K631 |
| Model Name | Castor |
| Layout | 65% (68 Keys) |
| Connectivity | Wired (USB-C) |
| Switch Type | Hot-Swappable Quiet Red Linear Mechanical Switches |
| Actuation Force | 40g |
| Travel Distance | 2.0mm |
| Click Lifespan | 50 Million |
| Backlighting | RGB (20+ preset modes, adjustable brightness/speed, music sync) |
| Material | Polycarbonate |
| Dimensions (L x W x H) | 12.2" x 4.1" x 1.1" |
| Weight | 1 Kilogram |
| Included Accessories | USB Cable, Keycap Puller, Switch Puller, Replacement Switches |
Warranty Information
The Redragon K631 Castor keyboard comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and ensures the product meets its specified performance standards under normal use. Please retain your proof of purchase for warranty claims.
Support
For further assistance, technical support, or to download the latest software and drivers, please visit the official Redragon website:
You can also find FAQs and community forums on the website for additional help.







