Internal-External Thread Mill 20-56

All are made of solid carbide with an aluminum-titanium-nitride (AlTiN) coating, so they have high strength and excellent wear resistance, even when cutting hard and abrasive material.

When used for internal threading, thread mills can create threads of any size equal to or greater than the minimum size listed. They leave space in the hole for chips to fall, and a broken thread mill can fall into the hole without damaging the workpiece.

Thread mills for internal threading cut threads more quickly than other thread mills, but the threads they create have a fixed pitch.

Thread mills for internal/external threading have a single cutting point that cuts threads in a range of different pitches on both the inside and outside of the workpiece.

Threads Per Inch: 20-56

Shank Diameter: 1/4"

Overall Length: 2.5"

Mill Diameter: 0.18"

Maximum Tapping Depth: 0.500"

Min. Thread Size: 1/4"