BenchReference / Drill sizes / 7.3 mm 7.3 mm Drill Decimal inches 0.2874″
Millimeters 7.3 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 9/32″ 0.2813″ / 7.144 mm −0.156 mm (−0.0062″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.509 mm (−0.0594″)
Letter L 0.2900″ / 7.366 mm +0.066 mm (+0.0026″)
−0.584 mm +0.584 mm 7.3 mm 7.1 mm −0.2 mm 7.2 mm −0.1 mm 7.4 mm +0.1 mm 7.5 mm +0.2 mm 9/32″ −0.156 mm L +0.066 mm ← #1 −1.509 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.58 mm
Positive difference = cuts a slightly larger hole than 7.3 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 7.3 mm 7.1 mm 0.2795 7.1 −0.2 mm 7.2 mm 0.2835 7.2 −0.1 mm 7.3 mm 0.2874 7.3 — 7.4 mm 0.2913 7.4 +0.1 mm 7.5 mm 0.2953 7.5 +0.2 mm
← 7.2 mm (smaller) 7.4 mm (larger) →
Compare 7.3 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 7.3 mm. See all data sources .