BenchReference / Drill sizes / 15/16″ 15/16″ Drill Bit Decimal inches 0.9375″
Millimeters 23.813 mm
System Fractional inch
In 64ths 60/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 21 mm 0.8268″ / 21 mm −2.813 mm (−0.1107″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −18.021 mm (−0.7095″)
Letter Z 0.4130″ / 10.49 mm −13.322 mm (−0.5245″)
−1.905 mm +1.905 mm 15/16″ 29/32″ −0.794 mm 59/64″ −0.397 mm 61/64″ +0.397 mm 31/32″ +0.794 mm ← 21 mm −2.813 mm ← #1 −18.021 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.91 mm
Positive difference = cuts a slightly larger hole than 15/16″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 15/16″ 29/32″ 0.9063 23.019 −0.794 mm 59/64″ 0.9219 23.416 −0.397 mm 15/16″ 0.9375 23.813 — 61/64″ 0.9531 24.209 +0.397 mm 31/32″ 0.9688 24.606 +0.794 mm
← 59/64″ (smaller) 61/64″ (larger) →
Compare 15/16″ 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 0.9375″. See all data sources .