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What is the tap drill for a ½-20 UNF-2B thread?

  1. What is the tap drill for a ½-20 UNF-2B thread?
Step 1

The united thread series is classified into coarse threads, fine threads and extra fine threads. The symbol UNF denotes unified fine pitch threads. The threads are further divided into two categories with three classes of fit.

  • External threads – Class 1A, 2A and 3A.
  • Internal threads – Class 1B, 2B and 3B.
Step 2

The tap drill size can be obtained for the given thread using a tap drill chart if ...

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