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They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. The drill size chart below contains all commonly used centre drill bit sizes.
9 wrz 2018 · The drill size chart below contains imperial and metric drill bit diameter measurements for all number and letter gauges.
This chart shows the diameters of number gauge drills size 80 (the smallest) to size 1 (the largest).
Number and letter sizes of drills - with decimal equivalents* *Sizes starting with No. 80 and going up to 1 inch. This table is useful for quickly determining the nearest drill size for any decimal, for root diameters, body drills, etc.
0.9844. 25.004. 1.0000. 25.400. Amazingly, we keep nearly all of the above sizes in stock as HSS Jobber Drills Even more amazingly, we haven't included all of the standard sizes available,
Numbered Drill Sizes converted to Metric and Imperial equivalent sizes Number Number Number Number Size mm inches Size mm inches Size mm inches Size mm inches 80 0.3429 0.0135 60 1.0160 0.0400 40 2.4892 0.0980 20 4.0894 0.1610 79 0.3683 0.0145 59 1.0414 0.0410 39 2.5273 0.0995 19 4.2164 0.1660 ... Drill size chart.xlsx Author:
Drill Bit Size Chart. The drill bit size chart provides equivalent sizes for letter, metric, wire gauge, and fractional drill bit sizes, allowing the user to select the correct drill bit for their project.
