ANSWERS: 1
  • Drill-bit sizes will vary according to the size of tap. When drilling for a 1/4-24 NS tap, a #4 size drill bit is required; 1/4-28 NF requires a #3 drill bit; 1/4-32 NEF uses a 7/32 drill bit; and 1/4-40 NS needs a #1 drill bit.

    Source:

    Tap Drill Chart

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