BenchReference

#10 Drill Bit

Decimal inches 0.1935″
Millimeters 4.915 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 4.9 mm 0.1929″ / 4.9 mm −0.015 mm (−0.0006″)
Fractional inch 3/16″ 0.1875″ / 4.762 mm −0.152 mm (−0.0060″)
Letter A 0.2340″ / 5.944 mm +1.029 mm (+0.0405″)
−0.393 mm+0.393 mm#10#12−0.114 mm#11−0.064 mm#9+0.063 mm#8+0.14 mm3/16″−0.152 mm4.9 mm−0.015 mmA +1.029 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.39 mm
Positive difference = cuts a slightly larger hole than #10. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #10
#12 0.1890 4.801 −0.114 mm
#11 0.1910 4.851 −0.064 mm
#10 0.1935 4.915 —
#9 0.1960 4.978 +0.063 mm
#8 0.1990 5.055 +0.14 mm
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 number size is 0.1935″. See all data sources.