BenchReference

#5 Drill Bit

Decimal inches 0.2055″
Millimeters 5.22 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 5.2 mm 0.2047″ / 5.2 mm −0.02 mm (−0.0008″)
Fractional inch 13/64″ 0.2031″ / 5.159 mm −0.06 mm (−0.0024″)
Letter A 0.2340″ / 5.944 mm +0.724 mm (+0.0285″)
−0.418 mm+0.418 mm#5#7−0.114 mm#6−0.038 mm#4+0.089 mm#3+0.191 mm13/64″−0.06 mm5.2 mm−0.02 mmA +0.724 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.42 mm
Positive difference = cuts a slightly larger hole than #5. Sizes beyond the window are listed with arrows — they are not close substitutes.

Clearance drill for

Thread Fit
#10-24 UNC close
#10-32 UNF close

Neighboring number sizes

Drill Decimal in mm vs #5
#7 0.2010 5.105 −0.114 mm
#6 0.2040 5.182 −0.038 mm
#5 0.2055 5.22 —
#4 0.2090 5.309 +0.089 mm
#3 0.2130 5.41 +0.191 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 0.2055″. See all data sources.