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In order to allow for precision, drill bits come in an extremely wide range of sizes. The sizes use several different naming conventions, including fractions, numbers and letters. All fractions of 64ths, from 1/64th through 63/64ths, are named by their lowest fractional equivalent (1/32", 1/16", 5/64", etc...). There are also size options that fall between many of these fractions. Common # sizes go from #80 through #1, in ascending sizes, up to .2280. Sizes over .2280 which aren't named for their fraction of 64ths, are named by letters, ascending from A (.2340) through Z (.4130). The chart below shows drill sizes up to 1 inch in diameter.

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Many types of screws require that a pilot hole be drilled before they are installed. Self-drilling screws can, of course, drill their own pilot hole, but other types of tapping, thread cutting, thread forming or thread rolling screws need help getting started. Blunt tipped screws like Type B Tapping, Type F Thread Cutting & Thread Forming Screws for Plastics or Metals require the proper sizing to allow for insertion into material. Even sharp pointed screws such as Type A or Type AB Self-Tapping Screws can split wood or distort metal as they're driven if they don't have a properly sized pilot hole. Below, we have included charts displaying pilot hole diameter and proper drill bit sizing for most varieties of screws we carry. At the end of this section, we've also included a chart showing common drill bit sizes and the names used for them.

One of the most fundamental operations performed on any machined part is creating a smooth workpiece surface through face milling. Kennametal indexable face milling inserts and bodies are the ideal tooling system for the perpendicular cutting of flat surfaces in a variety of materials. Our face milling platform features different sizes, cutting edges, and precision grades. Regardless of your application, you can trust the quality and designs of Kennametal indexable face mills to get the job done.

Due to the wide variety of materials and material thicknesses that these screws are used with, please refer to the spec sheet here.

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