5/16-18 · National Coarse (UNC)

For 5/16-18 · National Coarse (UNC), thread or drill designation is 5/16-18; record type is tap_drill; tap drill or decimal size is F; thread series is National Coarse (UNC), recorded from its source on 2026-08-28; source re-checked 2026-09-15.

Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.

What the source says

5/16-18 | F

— victornet.com, retrieved 2026-08-28

Source

• victornet.comhttps://www.victornet.com/reference/Tap_Drill.html

Last verified against source: 2026-09-15. Due for re-check by 2031-08-27. This page as Markdown · OKF bundle · full dataset as JSON.