The exact information found on a drill bit PDF chart depends on the type of the chart. There are three types of drill bit PDF charts available at ImperialSupplies.com: a chart of drill sizes' decimal equivalents, a tap drill chart and a drill bit RPM chart.
Imperial Supplies' decimal equivalent table allows users to determine which drill piece is required for a given job when instructions are given in millimeters or the decimal equivalent. It also highlights measurements where there is no direct drill bit equivalent. Sizes are generally given from 0.10 to 25.40 millimeters, although the first drill piece listed in the chart is given at 0.34 millimeters. Tables with similar information but slightly different arrangement are also available at CSGNetwork.com and CustomPartNet.com.
The second chart provides information on tap size, drill size and probable percentage thread. These figures are also presented in the form of equivalent readings to help the user choose the right tool for the job at hand.
The third chart at ImperialSupplies.com provides the maximum RPM for working with specific drills, depending on the drilled material. Each drill size is followed by its decimal equivalent in inches and maximum RPM numbers for working with aluminum, mild steel, cast iron and stainless steel.