3.9 mm
For 3.9 mm, record type is drill_decimal; tap drill or decimal size is .1535, recorded from its source on 2026-08-28; source re-checked 2026-09-15.
- Thread or drill designation
- 3.9 mm our reading
- Record type
- drill_decimal our reading
- Tap drill or decimal size
- .1535 verified
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
3.90mm | .1535
— victornet.com, retrieved 2026-08-28
Source
- victornet.comhttps://www.victornet.com/reference/Sizes_Equivalents.html