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drill size

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polecat:
just bought an american benjamin347 air rifle i need to fix the valve which as it is  american it's got funny thread sizes i've bought the tap to make the tool so i'm asking what size hole do i need to drill thread size is 9/32 x 32 tpi
thanks polecat

vtsteam:
If you use rule of thumb that drill size is diameter minus pitch, that works out to 9/32 minus 1/32, or a 1/4" drill.

mattinker:
Hi,

I did a web search for "drill size for tapping chart pdf" which led me to amongst other things:-

http://www.libertyfastener.com/Guide%20to%20information/Tap%20Drill%20Size%20Chart%20for%20Standard%20Threads.pdf

I think that the WWW is a good place to start with any kind of question like this.

Regards, Matthew.

polecat:
thanks again lads
polecat

vtsteam:
9/32"-32 is an odd size and doesn't appear on the usual online US drill and tap charts. Hence the rule of thumb.  :smart:

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