BenchReference / Drill sizes / 11.1 mm 11.1 mm Drill Decimal inches 0.4370″
Millimeters 11.1 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 7/16″ 0.4375″ / 11.112 mm +0.012 mm (+0.0005″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −5.309 mm (−0.2090″)
Letter Z 0.4130″ / 10.49 mm −0.61 mm (−0.0240″)
−0.888 mm +0.888 mm 11.1 mm 10.9 mm −0.2 mm 11 mm −0.1 mm 11.2 mm +0.1 mm 11.3 mm +0.2 mm Z −0.61 mm 7/16″ +0.012 mm ← #1 −5.309 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.89 mm
Positive difference = cuts a slightly larger hole than 11.1 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 11.1 mm 10.9 mm 0.4291 10.9 −0.2 mm 11 mm 0.4331 11 −0.1 mm 11.1 mm 0.4370 11.1 — 11.2 mm 0.4409 11.2 +0.1 mm 11.3 mm 0.4449 11.3 +0.2 mm
← 11 mm (smaller) 11.2 mm (larger) →
Compare 11.1 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 11.1 mm. See all data sources .