4-40 Future Thumb Nut with Set Screw, 2 Pieces - Black (JCO5240-2)

These aluminum 4-40 future thumb nuts with set screws offer a quick, secure way to secure battery packs in RC cars such as the RC10 and RC10T, replacing screws with washers for faster installation and removal. The package includes two closed-end thumb nuts with a JC logo and a spiked perimeter for easy gripping, along with 5/8-inch set screws to install into battery cups or buckets before attaching the nuts. They are designed to press down into most battery brace configurations for dependable, tool-free retention.

Crafted from aluminum and finished in blue or stealth black anodized colors, these thumb nuts feature 4-40 threads for compatibility with common hardware. The spiked perimeter aids grip during hand-tightening, and the included two nuts and set screws streamline setup and maintenance, allowing quick battery changes with confidence.