BenchReference / Drill sizes / 4.9 mm 4.9 mm Drill Decimal inches 0.1929″
Millimeters 4.9 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 3/16″ 0.1875″ / 4.762 mm −0.138 mm (−0.0054″)
Number (wire gauge) #10 0.1935″ / 4.915 mm +0.015 mm (+0.0006″)
Letter A 0.2340″ / 5.944 mm +1.044 mm (+0.0411″)
−0.392 mm +0.392 mm 4.9 mm 4.7 mm −0.2 mm 4.8 mm −0.1 mm 5 mm +0.1 mm 5.1 mm +0.2 mm 3/16″ −0.138 mm #10 +0.015 mm A +1.044 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.39 mm
Positive difference = cuts a slightly larger hole than 4.9 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 4.9 mm 4.7 mm 0.1850 4.7 −0.2 mm 4.8 mm 0.1890 4.8 −0.1 mm 4.9 mm 0.1929 4.9 — 5 mm 0.1969 5 +0.1 mm 5.1 mm 0.2008 5.1 +0.2 mm
← 4.8 mm (smaller) 5 mm (larger) →
Compare 4.9 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 4.9 mm. See all data sources .