What is the Closest Drill Size?

[Paul Jones]

Rick and Marv,

Great set of tables and I made a similar table for finding the best press fit holes sizes under 1/2" dia. I kept in a clear vinyl sleeve.

However, a few years ago I invested in buying the Calculated Industries Machinist Calc Pro for less than $40 when at sale at Enco. It has an extensive set of calculations and table look-ups. My calculator version is no longer available and they now have a more expensive version that includes specifying the materials to be machined. Nonetheless, I still use the drill size feature the most using the "+" or "-" key to find drill sizes larger or smaller than the exact drill size for press or sliding fits.

I also like the free Android phone apps "Knurling Calculator" and "Machinist Buddy" (has a lot of calculations and reference tables).

Regards,
Paul