BenchReference / Drill sizes / 3/4″ 3/4″ Drill Bit Decimal inches 0.7500″
Millimeters 19.05 mm
System Fractional inch
In 64ths 48/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 19 mm 0.7480″ / 19 mm −0.05 mm (−0.0020″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −13.259 mm (−0.5220″)
Letter Z 0.4130″ / 10.49 mm −8.56 mm (−0.3370″)
−1.524 mm +1.524 mm 3/4″ 23/32″ −0.794 mm 47/64″ −0.397 mm 49/64″ +0.397 mm 25/32″ +0.794 mm 19 mm −0.05 mm ← #1 −13.259 mm ← Z −8.56 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.52 mm
Positive difference = cuts a slightly larger hole than 3/4″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 3/4″ 23/32″ 0.7188 18.256 −0.794 mm 47/64″ 0.7344 18.653 −0.397 mm 3/4″ 0.7500 19.05 — 49/64″ 0.7656 19.447 +0.397 mm 25/32″ 0.7813 19.844 +0.794 mm
← 47/64″ (smaller) 49/64″ (larger) →
Compare 3/4″ 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 0.7500″. See all data sources .