BenchReference

#24 Drill Bit

Decimal inches 0.1520″
Millimeters 3.861 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 3.9 mm 0.1535″ / 3.9 mm +0.039 mm (+0.0015″)
Fractional inch 5/32″ 0.1563″ / 3.969 mm +0.108 mm (+0.0043″)
Letter A 0.2340″ / 5.944 mm +2.083 mm (+0.0820″)
−0.309 mm+0.309 mm#24#26−0.127 mm#25−0.064 mm#23+0.051 mm#22+0.127 mm3.9 mm+0.039 mm5/32″+0.108 mmA +2.083 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.31 mm
Positive difference = cuts a slightly larger hole than #24. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #24
#26 0.1470 3.734 −0.127 mm
#25 0.1495 3.797 −0.064 mm
#24 0.1520 3.861 —
#23 0.1540 3.912 +0.051 mm
#22 0.1570 3.988 +0.127 mm
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 number size is 0.1520″. See all data sources.