Originally posted by GregMuller
<br />This may be a newbie question but what is a "D" drill bit.
A 'D' drill bit is a little under 1/4".
1/4" = .250"
D = .246"
For SAE drill bits, there are two kinds of sizes:
Fractional drills, like 1/4", 5/16", etc.
Number and letter sizes:
Size 80 bit is .0135", VERY small.
Size 1 bit is .2280", a little bigger than 7/32"
Then the letter sized bits start with:
Size A bit is .234"
Size Z bit is .413"
Larger bits than Z are all fractional sizes.
A chart with drill bit sizes, screw sizes, and the corresponding taps and dies can be found at:
http://www.offroaders.com/info/tech-corner/taps-drills.htm
Hope this helps !