[SEL] spark plug tap drill size

[R and E Freeman]

Sounds like its a 1.2 or 1.25 pitch thread. A general rule of thump for 
metric threads is to deduct the thread pitch off the diameter and that gives 
you the drilling size


Ray Freeman
Portable Line Boring
http://www.plb.iinet.net.au
plb at plb.iinet.net.au
----- Original Message ----- 
From: "Fuller & Johnson" <fuller_johnson at yahoo.com>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Wednesday, March 02, 2005 7:59 AM
Subject: Re: [SEL] spark plug tap drill size


> It's 16.8mm tap drill for 18mm sparkplug thread.  Decimal is .6614.  21/32 
> is .005 undersize but will work fine.
>
>
> Bill Boyce <bboyce at swat.coop> wrote:
> hello all,,,
> can someone give me the tap drill size for an 18mm spark plug tap,,,, i 
> know i wont have a metric drill that large, so what would be closest inch 
> size drill ?
> thanks in advance,,
> bill boyce
> lost prairie,arkansas
> _______________________________________________
> SEL mailing list
> SEL at lists.stationary-engine.com
> http://www.stationary-engine.com/mailman/listinfo/sel
>
>
> Cheers!  NICK
>
>
> Visit the home of Fuller & Johnson engines on the web!
>
> "He who sees the other first already has half the victory."   Erich 
> Hartmann
>
> "Verloren ist nur, wer sich selbst aufgibt"  Hans Rudel
>
>
>
>
>
>
>
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> SEL mailing list
> SEL at lists.stationary-engine.com
> http://www.stationary-engine.com/mailman/listinfo/sel
>