BenchReference / Drill sizes / 13/32″ 13/32″ Drill Bit Decimal inches 0.4063″
Millimeters 10.319 mm
System Fractional inch
In 64ths 26/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 10.3 mm 0.4055″ / 10.3 mm −0.019 mm (−0.0007″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −4.528 mm (−0.1782″)
Letter Y 0.4040″ / 10.262 mm −0.057 mm (−0.0023″)
−0.826 mm +0.826 mm 13/32″ 3/8″ −0.794 mm 25/64″ −0.397 mm 27/64″ +0.397 mm 7/16″ +0.794 mm Y −0.057 mm 10.3 mm −0.019 mm ← #1 −4.528 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±0.83 mm
Positive difference = cuts a slightly larger hole than 13/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 13/32″ 3/8″ 0.3750 9.525 −0.794 mm 25/64″ 0.3906 9.922 −0.397 mm 13/32″ 0.4063 10.319 — 27/64″ 0.4219 10.716 +0.397 mm 7/16″ 0.4375 11.112 +0.794 mm
← 25/64″ (smaller) 27/64″ (larger) →
Compare 13/32″ 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 0.4063″. See all data sources .