BenchReference / Drill sizes / 47/64″ 47/64″ Drill Bit Decimal inches 0.7344″
Millimeters 18.653 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 18.5 mm 0.7283″ / 18.5 mm −0.153 mm (−0.0060″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −12.862 mm (−0.5064″)
Letter Z 0.4130″ / 10.49 mm −8.163 mm (−0.3214″)
−1.492 mm +1.492 mm 47/64″ 45/64″ −0.794 mm 23/32″ −0.397 mm 3/4″ +0.397 mm 49/64″ +0.794 mm 18.5 mm −0.153 mm ← #1 −12.862 mm ← Z −8.163 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.49 mm
Positive difference = cuts a slightly larger hole than 47/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 47/64″ 45/64″ 0.7031 17.859 −0.794 mm 23/32″ 0.7188 18.256 −0.397 mm 47/64″ 0.7344 18.653 — 3/4″ 0.7500 19.05 +0.397 mm 49/64″ 0.7656 19.447 +0.794 mm
← 23/32″ (smaller) 3/4″ (larger) →
Compare 47/64″ 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 0.7344″. See all data sources .