Tap Size Chart
by Eric Van Albert
| Tap |
Minor Diameter |
Major Diameter |
Tap (minor) Drill Size |
Through (major) Drill Size |
| 1/4 - 20 |
0.1887" |
0.2500" |
#7 (0.2010") or 13/64" (0.2031") |
1/4" (0.2500") or F (0.2570") or H (.2660") |
| 10 - 24 |
0.1389" |
0.1900" |
#25 (0.1495"), NFE* |
13/64 (0.2031") or #9 (0.1960") or #7 (0.2010") |
| 10 - 32 |
0.1517" |
#21 (0.1590"), NFE* |
| 8 - 32 |
0.1360" |
0.1640" |
#29 (0.1360"), NFE* |
5/32" (0.1563") or #18 (0.1695") or #16 (0.1770") |
| 6 - 32 |
0.0996" |
0.1380" |
#36 (0.1065") or 7/64 (.1094") |
9/64" (0.1406") or #27 (0.1440") or #25 (0.1495) |
*
NFE - no fractional equivalent
