BenchReference

#39 Drill Bit

Decimal inches 0.0995″
Millimeters 2.527 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 2.5 mm 0.0984″ / 2.5 mm −0.027 mm (−0.0011″)
Fractional inch 3/32″ 0.0938″ / 2.381 mm −0.146 mm (−0.0058″)
Letter A 0.2340″ / 5.944 mm +3.416 mm (+0.1345″)
−0.202 mm+0.202 mm#39#41−0.089 mm#40−0.038 mm#38+0.051 mm#37+0.114 mm3/32″−0.146 mm2.5 mm−0.027 mmA +3.416 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.2 mm
Positive difference = cuts a slightly larger hole than #39. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #39
#41 0.0960 2.438 −0.089 mm
#40 0.0980 2.489 −0.038 mm
#39 0.0995 2.527 —
#38 0.1015 2.578 +0.051 mm
#37 0.1040 2.642 +0.114 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 0.0995″. See all data sources.