BenchReference / Drill sizes / 2.3 mm 2.3 mm Drill Decimal inches 0.0906″
Millimeters 2.3 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 3/32″ 0.0938″ / 2.381 mm +0.081 mm (+0.0032″)
Number (wire gauge) #43 0.0890″ / 2.261 mm −0.039 mm (−0.0016″)
Letter A 0.2340″ / 5.944 mm +3.644 mm (+0.1434″)
−0.184 mm +0.184 mm 2.3 mm 2.2 mm −0.1 mm 2.4 mm +0.1 mm #43 −0.039 mm 3/32″ +0.081 mm ← 2.1 mm −0.2 mm 2.5 mm +0.2 mm → A +3.644 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.18 mm
Positive difference = cuts a slightly larger hole than 2.3 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 2.3 mm 2.1 mm 0.0827 2.1 −0.2 mm 2.2 mm 0.0866 2.2 −0.1 mm 2.3 mm 0.0906 2.3 — 2.4 mm 0.0945 2.4 +0.1 mm 2.5 mm 0.0984 2.5 +0.2 mm
← 2.2 mm (smaller) 2.4 mm (larger) →
Compare 2.3 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 2.3 mm. See all data sources .