BenchReference

#53 Drill Bit

Decimal inches 0.0595″
Millimeters 1.511 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.5 mm 0.0591″ / 1.5 mm −0.011 mm (−0.0004″)
Fractional inch 1/16″ 0.0625″ / 1.587 mm +0.076 mm (+0.0030″)
Letter A 0.2340″ / 5.944 mm +4.432 mm (+0.1745″)
−0.15 mm+0.15 mm#53#54−0.114 mm#52+0.102 mm1.5 mm−0.011 mm1/16″+0.076 mm← #55 −0.19 mm#51 +0.191 mm →A +4.432 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #53. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
#1-64 UNC 0.0730″ / 1.854 mm 64 TPI
#1-72 UNF 0.0730″ / 1.854 mm 72 TPI

The standard chart recommendation (≈75% thread engagement). Application-specific factors — material, hole depth, tap type — can justify a different drill.

Neighboring number sizes

Drill Decimal in mm vs #53
#55 0.0520 1.321 −0.19 mm
#54 0.0550 1.397 −0.114 mm
#53 0.0595 1.511 —
#52 0.0635 1.613 +0.102 mm
#51 0.0670 1.702 +0.191 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Machinery’s Handbook — tap drill charts (Industrial Press). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this number size is 0.0595″. See all data sources.