BenchReference / Drill sizes / 10.6 mm 10.6 mm Drill Decimal inches 0.4173″
Millimeters 10.6 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 27/64″ 0.4219″ / 10.716 mm +0.116 mm (+0.0046″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −4.809 mm (−0.1893″)
Letter Z 0.4130″ / 10.49 mm −0.11 mm (−0.0043″)
−0.848 mm +0.848 mm 10.6 mm 10.4 mm −0.2 mm 10.5 mm −0.1 mm 10.7 mm +0.1 mm 10.8 mm +0.2 mm Z −0.11 mm 27/64″ +0.116 mm ← #1 −4.809 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.85 mm
Positive difference = cuts a slightly larger hole than 10.6 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 10.6 mm 10.4 mm 0.4094 10.4 −0.2 mm 10.5 mm 0.4134 10.5 −0.1 mm 10.6 mm 0.4173 10.6 — 10.7 mm 0.4213 10.7 +0.1 mm 10.8 mm 0.4252 10.8 +0.2 mm
← 10.5 mm (smaller) 10.7 mm (larger) →
Compare 10.6 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 10.6 mm. See all data sources .