BenchReference / Drill sizes / 9/32″ 9/32″ Drill Bit Decimal inches 0.2813″
Millimeters 7.144 mm
System Fractional inch
In 64ths 18/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 7.1 mm 0.2795″ / 7.1 mm −0.044 mm (−0.0017″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.353 mm (−0.0532″)
Letter K 0.2810″ / 7.137 mm −0.006 mm (−0.0002″)
−0.572 mm +0.572 mm 9/32″ 17/64″ −0.397 mm 19/64″ +0.397 mm 7.1 mm −0.044 mm K −0.006 mm ← 1/4″ −0.794 mm ← #1 −1.353 mm 5/16″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.57 mm
Positive difference = cuts a slightly larger hole than 9/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 9/32″ 1/4″ 0.2500 6.35 −0.794 mm 17/64″ 0.2656 6.747 −0.397 mm 9/32″ 0.2813 7.144 — 19/64″ 0.2969 7.541 +0.397 mm 5/16″ 0.3125 7.938 +0.794 mm
← 17/64″ (smaller) 19/64″ (larger) →
Compare 9/32″ 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 0.2813″. See all data sources .