GD&T Basics Presented by Engineer Essentials

FREE Drill Tap Wall Chart

 

The most common way to produce an internal thread is to drill a hole and then use a tap to produce the thread. This is usually referred to as a tapping drill for the size of thread that needs to be produced.

This drill tap chart provides the information you need to properly drill and tap holes. This chart includes values for screw sizes and the proper size drill bit to use to make the hole for the tap.

 

There are four unique tables on this Drill Tap Chart:

  1. DRILL SIZES – This table lists all drill sizes up to 1.000” and the most common from 1.000” up to 1.500”
  2. INCH TAP DRILL SIZES – This table lists the most common tap sizes, typically one coarse and one fine thread each, from a #0 to 1-1/2
  3. METRIC TAP DRILL SIZES – This table lists the most common tap sizes, typically one coarse and one fine thread each, from M1.6 to M39
  4. PIPE THREADS (NPT) – This table lists the common NPT threads from 1/16” to 3”

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