BenchReference / Drill sizes / 2.2 mm 2.2 mm Drill Decimal inches 0.0866″
Millimeters 2.2 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 3/32″ 0.0938″ / 2.381 mm +0.181 mm (+0.0071″)
Number (wire gauge) #44 0.0860″ / 2.184 mm −0.016 mm (−0.0006″)
Letter A 0.2340″ / 5.944 mm +3.744 mm (+0.1474″)
−0.176 mm +0.176 mm 2.2 mm 2.05 mm −0.15 mm 2.1 mm −0.1 mm 2.3 mm +0.1 mm #44 −0.016 mm 2.4 mm +0.2 mm → 3/32″ +0.181 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.18 mm
Positive difference = cuts a slightly larger hole than 2.2 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 2.2 mm 2.05 mm 0.0807 2.05 −0.15 mm 2.1 mm 0.0827 2.1 −0.1 mm 2.2 mm 0.0866 2.2 — 2.3 mm 0.0906 2.3 +0.1 mm 2.4 mm 0.0945 2.4 +0.2 mm
← 2.1 mm (smaller) 2.3 mm (larger) →
Compare 2.2 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 2.2 mm. See all data sources .