BenchReference / Drill sizes / 11.8 mm 11.8 mm Drill Decimal inches 0.4646″
Millimeters 11.8 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 15/32″ 0.4688″ / 11.906 mm +0.106 mm (+0.0042″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −6.009 mm (−0.2366″)
Letter Z 0.4130″ / 10.49 mm −1.31 mm (−0.0516″)
−0.944 mm +0.944 mm 11.8 mm 11.6 mm −0.2 mm 11.7 mm −0.1 mm 11.9 mm +0.1 mm 12 mm +0.2 mm 15/32″ +0.106 mm ← #1 −6.009 mm ← Z −1.31 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.94 mm
Positive difference = cuts a slightly larger hole than 11.8 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 11.8 mm 11.6 mm 0.4567 11.6 −0.2 mm 11.7 mm 0.4606 11.7 −0.1 mm 11.8 mm 0.4646 11.8 — 11.9 mm 0.4685 11.9 +0.1 mm 12 mm 0.4724 12 +0.2 mm
← 11.7 mm (smaller) 11.9 mm (larger) →
Compare 11.8 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 11.8 mm. See all data sources .