BenchReference

1.25 mm Drill

Decimal inches 0.0492″
Millimeters 1.25 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 3/64″ 0.0469″ / 1.191 mm −0.059 mm (−0.0023″)
Number (wire gauge) #56 0.0465″ / 1.181 mm −0.069 mm (−0.0027″)
Letter A 0.2340″ / 5.944 mm +4.694 mm (+0.1848″)
−0.15 mm+0.15 mm1.25 mm1.1 mm−0.15 mm1.2 mm−0.05 mm1.3 mm+0.05 mm1.4 mm+0.15 mm#56−0.069 mm3/64″−0.059 mmA +4.694 mm →tick position = true diameter · metric neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1.25 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M1.6 × 0.35 0.0630″ / 1.6 mm 0.35 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 1.25 mm
1.1 mm 0.0433 1.1 −0.15 mm
1.2 mm 0.0472 1.2 −0.05 mm
1.25 mm 0.0492 1.25 —
1.3 mm 0.0512 1.3 +0.05 mm
1.4 mm 0.0551 1.4 +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 1.25 mm. See all data sources.