BenchReference

#12 Drill Bit

Decimal inches 0.1890″
Millimeters 4.801 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 4.8 mm 0.1890″ / 4.8 mm −0.001 mm (−0.0000″)
Fractional inch 3/16″ 0.1875″ / 4.762 mm −0.038 mm (−0.0015″)
Letter A 0.2340″ / 5.944 mm +1.143 mm (+0.0450″)
−0.384 mm+0.384 mm#12#14−0.178 mm#13−0.102 mm#11+0.051 mm#10+0.114 mm3/16″−0.038 mm4.8 mm−0.001 mmA +1.143 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.38 mm
Positive difference = cuts a slightly larger hole than #12. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #12
#14 0.1820 4.623 −0.178 mm
#13 0.1850 4.699 −0.102 mm
#12 0.1890 4.801 —
#11 0.1910 4.851 +0.051 mm
#10 0.1935 4.915 +0.114 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 0.1890″. See all data sources.