If a tapped hole is dimensioned around the perimeter of the hole, the thread details are displayed. The information that is displayed depends on the standard of the tapped hole.
- The ISO metric standard uses thread designation/nominal diameter/pitch/optional tolerance. The following example shows, a 16mm IMF hole. This is dimensioned as M16 x 1.5, showing the diameter of the hole and the pitch of the thread:
- The American standard uses nominal diameter/threads per inch/thread designation. For example, 3/4 -24 UNF.
- The British standard uses nominal diameter/thread designation. For example, 1/4 BSP.