Fractional drill bit for 1/8\" pipe tap

Steamhead (in transit)

For the 1/8" NPT tap is "R". There are several drill index sizes...(1) Fractional, the most common, (2) Number sizes 1 thru 80, with 80 being the smallest (3) Letter sizes A thru Z. "A" size begins where #1 size leaves off. The letter and numbered size drills "fill in the gaps" between the common fractional drill sizes, and are known and used in machine shops. The lettered and numbered drill sizes are also used to size orifices for gas burners to control the amount the gas output at a known pressure.

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Daniel_3

What is the size to lead a 1/8" npt pipe tap? I received something of a letter equivelant "R" which I have no clue about.

Al Corelli_2

I think it is \"Q\"



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allenleo

it is a

11/32" drill bit, but i don't know off the top of my head about the tap size and i dont feel like running out to the truck to check mine. if you dont have an answer for the tap by tomorrow i'll post it for you here.

allenleo

ok i did run out to my truck to check

it is a w-r 1/8"tap

Daniel_3

Thanks guys . . very informative!

hvacfreak

chart

http://www.csgnetwork.com/drillsizeconvert.html

Al Letellier_9

drill size

R drill is just a tad under 11/32" thats what I use with no problems