Guhring - 1/4-20 UNC 2 Flute 2B Modified Bottoming Spiral Flute Tap - Cobalt, Bright Finish, 2-1/2" OAL, Right Hand Flute, Right Hand Thread, Series 3931

Modified bottoming chamfers are similar to bottoming chamfers, but they are longer and have more teeth. They are used for threading blind holes and have 2 to 2-1/2 threads.

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.

Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.

Fast Spiral Flutes with 40-53 degree angles are suitable for ductile materials like aluminum and copper; medium to high carbon steels and free machining stainless steels.