Letter Drill Sizes In Decimal. Number drill bit sizes & letter drill bit sizes. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch.
In practice, you will seldom see number sizes past #80. Number drill bit sizes & letter drill bit sizes. Fractional sizes are measured in inches, while metric sizes are measured in millimeters.
This tapping drill chart originally appeared on the website of the late george aldrich.
Drill bits can be made in any size, but standards define sets of sizes that are widely produced and stocked. Here are the metric size drills Decimal equivalents and tap sizes of fraction , number, letter and metric sizes recommended tap drill sizes for approximately 75% depth of thread sizes decimal inches tap sizes to be used with drills as indicated sizes decimal Fractional sizes are measured in inches, while metric sizes are measured in millimeters.