BenchReference

2.05 mm Drill

Decimal inches 0.0807″
Millimeters 2.05 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 5/64″ 0.0781″ / 1.984 mm −0.066 mm (−0.0026″)
Number (wire gauge) #46 0.0810″ / 2.057 mm +0.007 mm (+0.0003″)
Letter A 0.2340″ / 5.944 mm +3.894 mm (+0.1533″)
−0.164 mm+0.164 mm2.05 mm1.9 mm−0.15 mm2 mm−0.05 mm2.1 mm+0.05 mm2.2 mm+0.15 mm5/64″−0.066 mm#46+0.007 mmA +3.894 mm →tick position = true diameter · metric neighbors above, equivalents below · window ±0.16 mm
Positive difference = cuts a slightly larger hole than 2.05 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M2.5 × 0.45 0.0984″ / 2.5 mm 0.45 mm

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

Neighboring metric sizes

Drill Decimal in mm vs 2.05 mm
1.9 mm 0.0748 1.9 −0.15 mm
2 mm 0.0787 2 −0.05 mm
2.05 mm 0.0807 2.05 —
2.1 mm 0.0827 2.1 +0.05 mm
2.2 mm 0.0866 2.2 +0.15 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 metric size is 2.05 mm. See all data sources.