BenchReference / Drill sizes / 3/16″ 3/16″ Drill Bit Decimal inches 0.1875″
Millimeters 4.762 mm
System Fractional inch
In 64ths 12/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 4.8 mm 0.1890″ / 4.8 mm +0.038 mm (+0.0015″)
Number (wire gauge) #12 0.1890″ / 4.801 mm +0.038 mm (+0.0015″)
Letter A 0.2340″ / 5.944 mm +1.181 mm (+0.0465″)
−0.381 mm +0.381 mm 3/16″ 4.8 mm +0.038 mm #12 +0.038 mm ← 5/32″ −0.794 mm ← 11/64″ −0.397 mm 13/64″ +0.397 mm → 7/32″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.38 mm
Positive difference = cuts a slightly larger hole than 3/16″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 3/16″ 5/32″ 0.1563 3.969 −0.794 mm 11/64″ 0.1719 4.366 −0.397 mm 3/16″ 0.1875 4.762 — 13/64″ 0.2031 5.159 +0.397 mm 7/32″ 0.2188 5.556 +0.794 mm
← 11/64″ (smaller) 13/64″ (larger) →
Compare 3/16″ 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 0.1875″. See all data sources .