BenchReference

#14 Drill Bit

Decimal inches 0.1820″
Millimeters 4.623 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 4.6 mm 0.1811″ / 4.6 mm −0.023 mm (−0.0009″)
Fractional inch 3/16″ 0.1875″ / 4.762 mm +0.14 mm (+0.0055″)
Letter A 0.2340″ / 5.944 mm +1.321 mm (+0.0520″)
−0.37 mm+0.37 mm#14#16−0.127 mm#15−0.051 mm#13+0.076 mm#12+0.178 mm4.6 mm−0.023 mm3/16″+0.14 mmA +1.321 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.37 mm
Positive difference = cuts a slightly larger hole than #14. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
#12-28 UNF 0.2160″ / 5.486 mm 28 TPI

The standard chart recommendation (≈75% thread engagement). Application-specific factors — material, hole depth, tap type — can justify a different drill.

Neighboring number sizes

Drill Decimal in mm vs #14
#16 0.1770 4.496 −0.127 mm
#15 0.1800 4.572 −0.051 mm
#14 0.1820 4.623 —
#13 0.1850 4.699 +0.076 mm
#12 0.1890 4.801 +0.178 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Machinery’s Handbook — tap drill charts (Industrial Press). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this number size is 0.1820″. See all data sources.