BenchReference / Drill sizes / 9/64″ 9/64″ Drill Bit Decimal inches 0.1406″
Millimeters 3.572 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 3.6 mm 0.1417″ / 3.6 mm +0.028 mm (+0.0011″)
Number (wire gauge) #28 0.1405″ / 3.569 mm −0.003 mm (−0.0001″)
Letter A 0.2340″ / 5.944 mm +2.372 mm (+0.0934″)
−0.286 mm +0.286 mm 9/64″ #28 −0.003 mm 3.6 mm +0.028 mm ← 7/64″ −0.794 mm ← 1/8″ −0.397 mm 5/32″ +0.397 mm → 11/64″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.29 mm
Positive difference = cuts a slightly larger hole than 9/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 9/64″ 7/64″ 0.1094 2.778 −0.794 mm 1/8″ 0.1250 3.175 −0.397 mm 9/64″ 0.1406 3.572 — 5/32″ 0.1563 3.969 +0.397 mm 11/64″ 0.1719 4.366 +0.794 mm
← 1/8″ (smaller) 5/32″ (larger) →
Compare 9/64″ 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 0.1406″. See all data sources .