What is a 4-40 Tap Drill Size

The 4-40 Tap Drill Size is #39 (0.0960 inches or 2.438 mm). This drill size is for tapping a hole for a standard 4-40 screw – a small, thin machine screw with a diameter of 0.112 inches and 40 threads per inch. This tap drill size is suitable for tapping most metals, although in some cases it may be necessary to use an oversize tap drill due to the hardness of the material being tapped.

What Size Hole is 4-40?

The 4-40 screw requires a hole size of 0.0960 inches (2.438 mm). The hole must have a slightly smaller diameter than the screw so that when it is inserted, it will be securely held in place by the threads of the screw.

What Screw Goes To a 4-40 Tapped Hole?

The most common screw to use with a 4-40 tapped hole is a 4-40 machine screw. This type of screw has a small diameter of 0.112 inches (2.845 mm) and is threaded with 40 threads per inch. It is available in various lengths and materials, including stainless steel, brass, aluminum, and plastic.

What is the Diameter of 4-40 Tap?

The 4-40 Tap has a diameter of 0.112 inches (2.845 mm). This is the same as the diameter [1] of a standard 4-40 screw so that when the tap is used to create a threaded hole, the thread will match the thread on the 4-40 screw and they will fit together snugly.

Conclusion

The 4-40 Tap Drill Size is #39 (0.0960 inches or 2.438 mm). This drill size is for tapping a hole for a standard 4-40 screw – a small, thin machine screw with a diameter of 0.112 inches and 40 threads per inch. The 4-40 screw requires a hole size of 0.0960 inches (2.438 mm). The most common type of screw to use with a 4-40 tapped hole is the 4-40 machine screw, which has a diameter of 0.112 inches (2.845 mm) and is threaded with 40 threads per inch. The tap used to create the threaded hole has the same diameter as the screws, which ensures that they will fit together snugly when they are inserted into the tapped hole.