BenchReference / Drill sizes / 1.2 mm 1.2 mm Drill Decimal inches 0.0472″
Millimeters 1.2 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 3/64″ 0.0469″ / 1.191 mm −0.009 mm (−0.0004″)
Number (wire gauge) #56 0.0465″ / 1.181 mm −0.019 mm (−0.0007″)
Letter A 0.2340″ / 5.944 mm +4.744 mm (+0.1868″)
−0.15 mm +0.15 mm 1.2 mm 1.1 mm −0.1 mm 1.25 mm +0.05 mm 1.3 mm +0.1 mm #56 −0.019 mm 3/64″ −0.009 mm ← 1 mm −0.2 mm A +4.744 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1.2 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 1.2 mm 1 mm 0.0394 1 −0.2 mm 1.1 mm 0.0433 1.1 −0.1 mm 1.2 mm 0.0472 1.2 — 1.25 mm 0.0492 1.25 +0.05 mm 1.3 mm 0.0512 1.3 +0.1 mm
← 1.1 mm (smaller) 1.25 mm (larger) →
Compare 1.2 mm 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 metric size is 1.2 mm. See all data sources .