Our Products

Telephone: 800-621-4274 Facsimile: 800-640-8044 DoD Cage Code: 7DVG8

54 Concourse Way Greer, South Carolina 29650

Tap Terminology

Brooke Cutting Tools USA is pleased to provide the following Thread Form Termnology illustration:

In some countries, the name “PLUG” is commonly used to indicate a Bottoming Tap.   In America, it is used to indicate a second tap.  To avoid confusion with American Terms, the terminology adopted by British Standard 949 1979 as shown above, should be used.

Short Hand and Machine, Long Shank Machine and Pipe Taps

4o (6-8 threads) Taper

8o (31/2-5 threads) Second

23o (2-3 threads) bottoming

Spiral Flute Taps

8o (4-50 threads)

Spiral Flute Taps

23o (2-3 threads)

Fluteless Taps

23o (2-3 threads)

For more information or assistance, please do not hesitate to contact us or call 800-621-4274. We look forward to working with you and your team.