DRILL CHART PDF
The term 'major diameter' refers to the distance between the two outer ridges of the threading, while the term 'minor diameter' refers to the distance between the two inner ridges of the threading.ĭownload and print the tap drill chart pdf for a quick reference table that will help you select the right tap and drill for your application, every time! Our comprehensive chart includes standard sizes, metric sizes, plug tap sizes and an 'at a glance' listing of the most popular tap drill sizes. Here again is the drill chart from my previous example: The first thing I need to do is to change my drill chart back to its base template so I can modify it and re-execute it.
Also listed on a good tap drill chart, you will find reference to 'threads per inch' (T.P.I), which refers to the thread count of the screw. For sizes of 1/4" or more, fractional sizes based on the screw diameter are used. Sizes less than 1/4" utilize a numbering system rather than fractional measurements, and range from #0-#12, with #0 being the smallest and #12 being the largest standard size before you reach 1/4". The other side has a decimal equivalent table and a 6' rule. Tap and Drill Reference Rulers One side of this ruler lists tap and drill sizes. Standard sizes are split into two classes – small diameter sets and large diameter sets. Style B charts provide a pipe tap drill chart as well as decimal equivalents of tap drill sizes, fractions, wire gauge drill sizes, letter drill sizes, and metric sizes. The third and final column lists the tap size and the threads per inch that will be required. The second column will list the inch decimal equivalent of the drill diameter of the the tap drill you need to use. Helicoil drill chart, helicoil drill size, helicoil,helicoil insert,helicoil inserts, heli-coil, helicoil tool, helicoil tools,helicoil tool kit, helicoil. The first column lists the standard drill sizes as a number (a fraction or letter drill size, for instance).
DRILL CHART HOW TO
How to Read a Tap Drill ChartĪ good tap drill chart like the printable PDF version below typically has three main columns or sections. A tap drill chart is an essential reference tool that every machinist should have readily accessible and at hand. Knowing the right tap drill size to use for your screws or bolts is nearly impossible to determine without the use of a good tap drill chart.
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