Throat sizes

[ttf_heinz gries]

Hello,

Some manufacturers call their throat sizes in letters.
How is the diameter of an A, B, C, D, E, F, throat?

[ttf_BGuttman]

Many times these are the drill sizes used to make the throat.  An E drill is 0.250" (you can convert to metric yourself).

There are drill size charts for letter drills on line with metric equivalents.

Here is an example: http://www.csgnetwork.com/drillsizeconvert.html

[ttf_heinz gries]

thanks Bruce

[ttf_heinz gries]

thanks Bruce