Final answer:
The tool used to cut new external threads is known as a die, which is different from thread pitch gauges, taps, and thread chasers, each serving particular threading tasks.
Step-by-step explanation:
The tool used to cut new external threads is a die. A die is a specialized tool used in manufacturing to create male threads. While a thread pitch gauge is used to measure the pitch of existing threads, a tap is used to cut internal threads within a hole, and a thread chaser is designed to clean up damaged threads without cutting new ones.