BenchReference / Drill sizes / 39/64″ 39/64″ Drill Bit Decimal inches 0.6094″
Millimeters 15.478 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 15.5 mm 0.6102″ / 15.5 mm +0.022 mm (+0.0009″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −9.687 mm (−0.3814″)
Letter Z 0.4130″ / 10.49 mm −4.988 mm (−0.1964″)
−1.238 mm +1.238 mm 39/64″ 37/64″ −0.794 mm 19/32″ −0.397 mm 5/8″ +0.397 mm 41/64″ +0.794 mm 15.5 mm +0.022 mm ← #1 −9.687 mm ← Z −4.988 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.24 mm
Positive difference = cuts a slightly larger hole than 39/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 39/64″ 37/64″ 0.5781 14.684 −0.794 mm 19/32″ 0.5938 15.081 −0.397 mm 39/64″ 0.6094 15.478 — 5/8″ 0.6250 15.875 +0.397 mm 41/64″ 0.6406 16.272 +0.794 mm
← 19/32″ (smaller) 5/8″ (larger) →
Compare 39/64″ with another size
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this fractional size is 0.6094″. See all data sources .