BenchReference

3/64″ Drill Bit

Decimal inches 0.0469″
Millimeters 1.191 mm
System Fractional inch

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.2 mm 0.0472″ / 1.2 mm +0.009 mm (+0.0004″)
Number (wire gauge) #56 0.0465″ / 1.181 mm −0.01 mm (−0.0004″)
Letter A 0.2340″ / 5.944 mm +4.753 mm (+0.1871″)
−0.15 mm+0.15 mm3/64″#56−0.01 mm1.2 mm+0.009 mm← 1/64″ −0.794 mm← 1/32″ −0.397 mm1/16″ +0.397 mm →5/64″ +0.794 mm →tick position = true diameter · fractional neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 3/64″. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
#0-80 UNF 0.0600″ / 1.524 mm 80 TPI

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

Neighboring fractional sizes

Drill Decimal in mm vs 3/64″
1/64″ 0.0156 0.397 −0.794 mm
1/32″ 0.0313 0.794 −0.397 mm
3/64″ 0.0469 1.191 —
1/16″ 0.0625 1.587 +0.397 mm
5/64″ 0.0781 1.984 +0.794 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 fractional size is 0.0469″. See all data sources.