#9 Drill Bit

Decimal inches 0.1960″

Millimeters 4.978 mm

System Number (wire gauge)

Nearest equivalents in other systems

System	Nearest drill	Size	Difference
Metric	5 mm	0.1969″ / 5 mm	+0.022 mm (+0.0009″)
Fractional inch	13/64″	0.2031″ / 5.159 mm	+0.181 mm (+0.0071″)
Letter	A	0.2340″ / 5.944 mm	+0.965 mm (+0.0380″)

Positive difference = cuts a slightly larger hole than #9. Sizes beyond the window are listed with arrows — they are not close substitutes.

Clearance drill for

Thread	Fit
#8-32 UNC	normal
#8-36 UNF	normal

Neighboring number sizes

Drill	Decimal in	mm	vs #9
#11	0.1910	4.851	−0.127 mm
#10	0.1935	4.915	−0.063 mm
#9	0.1960	4.978	—
#8	0.1990	5.055	+0.076 mm
#7	0.2010	5.105	+0.127 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 0.1960″. See all data sources.