BenchReference / Drill sizes / 9.4 mm 9.4 mm Drill Decimal inches 0.3701″
Millimeters 9.4 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 3/8″ 0.3750″ / 9.525 mm +0.125 mm (+0.0049″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −3.609 mm (−0.1421″)
Letter U 0.3680″ / 9.347 mm −0.053 mm (−0.0021″)
−0.752 mm +0.752 mm 9.4 mm 9.2 mm −0.2 mm 9.3 mm −0.1 mm 9.5 mm +0.1 mm 9.6 mm +0.2 mm U −0.053 mm 3/8″ +0.125 mm ← #1 −3.609 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.75 mm
Positive difference = cuts a slightly larger hole than 9.4 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 9.4 mm 9.2 mm 0.3622 9.2 −0.2 mm 9.3 mm 0.3661 9.3 −0.1 mm 9.4 mm 0.3701 9.4 — 9.5 mm 0.3740 9.5 +0.1 mm 9.6 mm 0.3780 9.6 +0.2 mm
← 9.3 mm (smaller) 9.5 mm (larger) →
Compare 9.4 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 9.4 mm. See all data sources .