A tap and die set is a collection of tools used for cutting screw threads in metal or plastic. The set includes taps for cutting internal threads and dies for cutting external threads. The set may also include other tools such as tap wrenches, die stocks, and screw pitch gauges.

Taps come in various sizes and shapes, and they are used to cut threads in holes drilled into metal or plastic. They can be used to cut threads by hand or with a tapping machine. The most common types of taps are taper taps, plug taps, and bottoming taps.

Dies are used to cut external threads on metal or plastic rods or bolts. They come in various sizes and shapes, and they can be used to cut threads by hand or with a die head. The most common types of dies are adjustable dies, solid dies, and circular dies.

Tap and die sets are available in different sizes and configurations, depending on the user’s needs. Small sets may include only a few taps and dies for use in basic applications, while larger sets may include a wider variety of sizes and types of taps and dies for use in more complex applications.

It is important to choose the right size and type of tap and die for the job to ensure accurate and clean threads. Proper lubrication and tapping techniques, such as backing off the tap periodically to clear chips and applying the correct amount of pressure, are also essential for achieving good results.