BenchReference / Drill sizes / 43/64″ 43/64″ Drill Bit Decimal inches 0.6719″
Millimeters 17.066 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 17 mm 0.6693″ / 17 mm −0.066 mm (−0.0026″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −11.274 mm (−0.4439″)
Letter Z 0.4130″ / 10.49 mm −6.575 mm (−0.2589″)
−1.365 mm +1.365 mm 43/64″ 41/64″ −0.794 mm 21/32″ −0.397 mm 11/16″ +0.397 mm 45/64″ +0.794 mm 17 mm −0.066 mm ← #1 −11.274 mm ← Z −6.575 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.37 mm
Positive difference = cuts a slightly larger hole than 43/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 43/64″ 41/64″ 0.6406 16.272 −0.794 mm 21/32″ 0.6563 16.669 −0.397 mm 43/64″ 0.6719 17.066 — 11/16″ 0.6875 17.462 +0.397 mm 45/64″ 0.7031 17.859 +0.794 mm
← 21/32″ (smaller) 11/16″ (larger) →
Compare 43/64″ 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 fractional size is 0.6719″. See all data sources .