BenchReference / Drill sizes / 1.4 mm 1.4 mm Drill Decimal inches 0.0551″
Millimeters 1.4 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 1/16″ 0.0625″ / 1.587 mm +0.188 mm (+0.0074″)
Number (wire gauge) #54 0.0550″ / 1.397 mm −0.003 mm (−0.0001″)
Letter A 0.2340″ / 5.944 mm +4.544 mm (+0.1789″)
−0.15 mm +0.15 mm 1.4 mm 1.25 mm −0.15 mm 1.3 mm −0.1 mm 1.5 mm +0.1 mm #54 −0.003 mm 1.6 mm +0.2 mm → 1/16″ +0.188 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1.4 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 1.4 mm 1.25 mm 0.0492 1.25 −0.15 mm 1.3 mm 0.0512 1.3 −0.1 mm 1.4 mm 0.0551 1.4 — 1.5 mm 0.0591 1.5 +0.1 mm 1.6 mm 0.0630 1.6 +0.2 mm
← 1.3 mm (smaller) 1.5 mm (larger) →
Compare 1.4 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 1.4 mm. See all data sources .