BenchReference / Drill sizes / 17 mm 17 mm Drill Decimal inches 0.6693″
Millimeters 17 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 43/64″ 0.6719″ / 17.066 mm +0.066 mm (+0.0026″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −11.209 mm (−0.4413″)
Letter Z 0.4130″ / 10.49 mm −6.51 mm (−0.2563″)
−1.36 mm +1.36 mm 17 mm 16 mm −1 mm 16.5 mm −0.5 mm 17.5 mm +0.5 mm 18 mm +1 mm 43/64″ +0.066 mm ← #1 −11.209 mm ← Z −6.51 mm tick position = true diameter · metric neighbors above, equivalents below · window ±1.36 mm
Positive difference = cuts a slightly larger hole than 17 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring metric sizes Drill Decimal in mm vs 17 mm 16 mm 0.6299 16 −1 mm 16.5 mm 0.6496 16.5 −0.5 mm 17 mm 0.6693 17 — 17.5 mm 0.6890 17.5 +0.5 mm 18 mm 0.7087 18 +1 mm
← 16.5 mm (smaller) 17.5 mm (larger) →
Compare 17 mm with another size
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 metric size is 17 mm. See all data sources .