taps to thread holes
chart for drill bits and tap (chart 2)
chart for drill bits and tap (chart 1)

Tap-Plug Carbon Steel National Fine Thread

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  • Precision cut threads, accurately formed for consistent, exact threading
  • Heat-treated and tempered for file hard threads and longer useful life
  • Designed for hand cutting applications
  • The plug style tap is the most commonly used style of tap with 3 to 5 threads chamfered
  • Refer to images for drill bit size/tap size