BenchReference

3.3 mm Drill

Decimal inches 0.1299″
Millimeters 3.3 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 1/8″ 0.1250″ / 3.175 mm −0.125 mm (−0.0049″)
Number (wire gauge) #30 0.1285″ / 3.264 mm −0.036 mm (−0.0014″)
Letter A 0.2340″ / 5.944 mm +2.644 mm (+0.1041″)
−0.264 mm+0.264 mm3.3 mm3.1 mm−0.2 mm3.2 mm−0.1 mm3.4 mm+0.1 mm3.5 mm+0.2 mm1/8″−0.125 mm#30−0.036 mmA +2.644 mm →tick position = true diameter · metric neighbors above, equivalents below · window ±0.26 mm
Positive difference = cuts a slightly larger hole than 3.3 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M4 × 0.7 0.1575″ / 4 mm 0.7 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 3.3 mm
3.1 mm 0.1220 3.1 −0.2 mm
3.2 mm 0.1260 3.2 −0.1 mm
3.3 mm 0.1299 3.3 —
3.4 mm 0.1339 3.4 +0.1 mm
3.5 mm 0.1378 3.5 +0.2 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 3.3 mm. See all data sources.