Global Drill Bit Conversion | Imperial to Metric Cross-Over Chart

Home / Precision Math Hub / Global Cross-Over Global Compatibility Imperial to Metric Cross-Over Grid Print Grid Imperial Size Decimal (In) Closest Metric (mm) Match Quality #80 .0135 0.35 mm Closest 1/64 .0156 0.40 mm Closest #60 .0400 1.00 mm Closest #53 .0595 1.50 mm Closest 1/16 .0625 1.60 mm Closest #31 .1200 3.00 mm Closest 1/8 .1250 3.175 mm Exact #19 .1660 4.20 mm Closest #9 .1960 5.00 mm Closest Letter A .2340 6.00 mm Closest 1/4 .2500 6.35 mm Exact Letter J .2770 7.00 mm Closest 5/16 .3125 8.00 mm Closest Letter V .3770 9.50 mm Closest 3/8 .3750 9.525 mm Exact 25/64 .3906 10.00 mm Closest 1/2 .5000 12.70 mm Exact
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