BenchReference

2.9 mm Drill

Decimal inches 0.1142″
Millimeters 2.9 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 7/64″ 0.1094″ / 2.778 mm −0.122 mm (−0.0048″)
Number (wire gauge) #33 0.1130″ / 2.87 mm −0.03 mm (−0.0012″)
Letter A 0.2340″ / 5.944 mm +3.044 mm (+0.1198″)
−0.232 mm+0.232 mm2.9 mm2.7 mm−0.2 mm2.8 mm−0.1 mm3 mm+0.1 mm3.1 mm+0.2 mm7/64″−0.122 mm#33−0.03 mmA +3.044 mm →tick position = true diameter · metric neighbors above, equivalents below · window ±0.23 mm
Positive difference = cuts a slightly larger hole than 2.9 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M3.5 × 0.6 0.1378″ / 3.5 mm 0.6 mm

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

Clearance drill for

Thread Fit
M2.5 × 0.45 normal

Neighboring metric sizes

Drill Decimal in mm vs 2.9 mm
2.7 mm 0.1063 2.7 −0.2 mm
2.8 mm 0.1102 2.8 −0.1 mm
2.9 mm 0.1142 2.9 —
3 mm 0.1181 3 +0.1 mm
3.1 mm 0.1220 3.1 +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 2.9 mm. See all data sources.