Which drill and tap do I need, and how about a Drill and Tap chart?




A Drill and Tap chart will tell you which drill to use for any hole for any job. It will tell you which one to use for a tap that you are using, it will tell you which one to use to remove a broken screw, or even tell you which one is the body drill for a certain screw. A body drill is a drill that offers minimum clearance for a screw. easier said, it is a drill that when used in a piece of material, when the screw is inserted it will go in easily but will touch all sides of the hole drilled.

This chart lists all English sized drill bits up to one inch, and all the commonly used taps. They have a column for a loose thread (60 percent) and for making a tighter thread (75 percent).

They are listed by their designated number, fraction size or their letter identifying code. The designations are basically numbered from 1 to 80, the smaller sizes are the larger numbers. In between some numbers you will find the fractions that didn’t match to the decimal size of the numbered ones. When they get larger than a number 1, then they start with letters and the fractions are between these also.

Their fractional value is also listed so you can identify exactly which drill you want to use in a precision situation. For the common use, this chart is too detailed, but if you get good enough to understand how to use all the sizes, the complete chart will come in handy. Precision is usually only necessary when you are working with a machined part. The general house handy mechanic will be using only a few basic size bits for inserting anchors or hanging pictures.

Any larger than these, and you will need a special bit or a much larged chuck on a larger drill.

This chart will help you when you need information on which drill or tap to use. If you are looking to build a web site then you will need other information. The information I found comes in easy to read and understand language. If you or someone you know is looking for this kind of reading check out site tools for a look. Much of the information is free.