BenchReference

#17 Drill Bit

Decimal inches 0.1730″
Millimeters 4.394 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 4.4 mm 0.1732″ / 4.4 mm +0.006 mm (+0.0002″)
Fractional inch 11/64″ 0.1719″ / 4.366 mm −0.029 mm (−0.0011″)
Letter A 0.2340″ / 5.944 mm +1.549 mm (+0.0610″)
−0.352 mm+0.352 mm#17#19−0.178 mm#18−0.089 mm#16+0.102 mm#15+0.178 mm11/64″−0.029 mm4.4 mm+0.006 mmA +1.549 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.35 mm
Positive difference = cuts a slightly larger hole than #17. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #17
#19 0.1660 4.216 −0.178 mm
#18 0.1695 4.305 −0.089 mm
#17 0.1730 4.394 —
#16 0.1770 4.496 +0.102 mm
#15 0.1800 4.572 +0.178 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 0.1730″. See all data sources.