BenchReference / Drill sizes / 11/32″ 11/32″ Drill Bit Decimal inches 0.3438″
Millimeters 8.731 mm
System Fractional inch
In 64ths 22/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 8.7 mm 0.3425″ / 8.7 mm −0.031 mm (−0.0012″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −2.94 mm (−0.1157″)
Letter S 0.3480″ / 8.839 mm +0.108 mm (+0.0042″)
−0.699 mm +0.699 mm 11/32″ 21/64″ −0.397 mm 23/64″ +0.397 mm 8.7 mm −0.031 mm S +0.108 mm ← 5/16″ −0.794 mm ← #1 −2.94 mm 3/8″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.7 mm
Positive difference = cuts a slightly larger hole than 11/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 11/32″ 5/16″ 0.3125 7.938 −0.794 mm 21/64″ 0.3281 8.334 −0.397 mm 11/32″ 0.3438 8.731 — 23/64″ 0.3594 9.128 +0.397 mm 3/8″ 0.3750 9.525 +0.794 mm
← 21/64″ (smaller) 23/64″ (larger) →
Compare 11/32″ 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 0.3438″. See all data sources .