BenchReference / Drill sizes / 11 mm 11 mm Drill Decimal inches 0.4331″
Millimeters 11 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 7/16″ 0.4375″ / 11.112 mm +0.112 mm (+0.0044″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −5.209 mm (−0.2051″)
Letter Z 0.4130″ / 10.49 mm −0.51 mm (−0.0201″)
−0.88 mm +0.88 mm 11 mm 10.8 mm −0.2 mm 10.9 mm −0.1 mm 11.1 mm +0.1 mm 11.2 mm +0.2 mm Z −0.51 mm 7/16″ +0.112 mm ← #1 −5.209 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.88 mm
Positive difference = cuts a slightly larger hole than 11 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring metric sizes Drill Decimal in mm vs 11 mm 10.8 mm 0.4252 10.8 −0.2 mm 10.9 mm 0.4291 10.9 −0.1 mm 11 mm 0.4331 11 — 11.1 mm 0.4370 11.1 +0.1 mm 11.2 mm 0.4409 11.2 +0.2 mm
← 10.9 mm (smaller) 11.1 mm (larger) →
Compare 11 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 mm. See all data sources .