BenchReference

#54 Drill Bit

Decimal inches 0.0550″
Millimeters 1.397 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.4 mm 0.0551″ / 1.4 mm +0.003 mm (+0.0001″)
Fractional inch 1/16″ 0.0625″ / 1.587 mm +0.19 mm (+0.0075″)
Letter A 0.2340″ / 5.944 mm +4.547 mm (+0.1790″)
−0.15 mm+0.15 mm#54#55−0.076 mm#53+0.114 mm1.4 mm+0.003 mm← #56 −0.216 mm#52 +0.216 mm →1/16″ +0.19 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #54. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #54
#56 0.0465 1.181 −0.216 mm
#55 0.0520 1.321 −0.076 mm
#54 0.0550 1.397 —
#53 0.0595 1.511 +0.114 mm
#52 0.0635 1.613 +0.216 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 0.0550″. See all data sources.