BenchReference

10.5 mm Drill

Decimal inches 0.4134″
Millimeters 10.5 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 13/32″ 0.4063″ / 10.319 mm −0.181 mm (−0.0071″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −4.709 mm (−0.1854″)
Letter Z 0.4130″ / 10.49 mm −0.01 mm (−0.0004″)
−0.84 mm+0.84 mm10.5 mm10.3 mm−0.2 mm10.4 mm−0.1 mm10.6 mm+0.1 mm10.7 mm+0.2 mm13/32″−0.181 mmZ−0.01 mm← #1 −4.709 mmtick position = true diameter · metric neighbors above, equivalents below · window ±0.84 mm
Positive difference = cuts a slightly larger hole than 10.5 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M12 × 1.5 0.4724″ / 12 mm 1.5 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
M10 × 1.5 close
M10 × 1 close
M10 × 1.25 close

Neighboring metric sizes

Drill Decimal in mm vs 10.5 mm
10.3 mm 0.4055 10.3 −0.2 mm
10.4 mm 0.4094 10.4 −0.1 mm
10.5 mm 0.4134 10.5 —
10.6 mm 0.4173 10.6 +0.1 mm
10.7 mm 0.4213 10.7 +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 10.5 mm. See all data sources.