BenchReference / Drill sizes / 13/64″ 13/64″ Drill Bit Decimal inches 0.2031″
Millimeters 5.159 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 5.2 mm 0.2047″ / 5.2 mm +0.041 mm (+0.0016″)
Number (wire gauge) #6 0.2040″ / 5.182 mm +0.022 mm (+0.0009″)
Letter A 0.2340″ / 5.944 mm +0.784 mm (+0.0309″)
−0.413 mm +0.413 mm 13/64″ 3/16″ −0.397 mm 7/32″ +0.397 mm #6 +0.022 mm 5.2 mm +0.041 mm ← 11/64″ −0.794 mm 15/64″ +0.794 mm → A +0.784 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.41 mm
Positive difference = cuts a slightly larger hole than 13/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 13/64″ 11/64″ 0.1719 4.366 −0.794 mm 3/16″ 0.1875 4.762 −0.397 mm 13/64″ 0.2031 5.159 — 7/32″ 0.2188 5.556 +0.397 mm 15/64″ 0.2344 5.953 +0.794 mm
← 3/16″ (smaller) 7/32″ (larger) →
Compare 13/64″ 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 0.2031″. See all data sources .