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11cycle
 Post subject: drill and tap size
PostPosted: Thu Apr 12, 2012 4:09 pm 

Joined: Sat Jun 11, 2011 7:22 pm
Posts: 143
Location: chazy,ny
Going to fill with weld the exhaust stud holes on my KH500.Looking for the correct drill and tap size for the original stud.Thanks.
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Walms
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 4:37 pm 
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Joined: Wed Jun 08, 2011 10:04 pm
Posts: 2223
Location: Just north of Toronto, Ontario
Tap drill size for a metric thread is the nominal dia. Minus the pitch

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AER005
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 6:16 pm 

Joined: Thu Jun 09, 2011 6:39 pm
Posts: 736
Location: Narooma NSW Aus
stud size 8-1.25 drill size for hole 6.8mm , you could use a 7mm drill bit if you carnt get hold of a fraction drill 6.8mm , hope that helps al
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11cycle
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 6:41 pm 

Joined: Sat Jun 11, 2011 7:22 pm
Posts: 143
Location: chazy,ny
Thanks for the replies!
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Jim
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 7:08 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
In my shop that would be 17/64" = 6.75mm :mrgreen:

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AER005
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 8:37 pm 

Joined: Thu Jun 09, 2011 6:39 pm
Posts: 736
Location: Narooma NSW Aus
Jim wrote:
In my shop that would be 17/64" = 6.75mm :mrgreen:

what language is that ;) , were modern in Aus and the bike is metric isnt it :D :D :D
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Jim
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 9:37 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
And you don't have a 6.75 mm bit in your modern shop? I have one here. :P

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AER005
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 10:54 pm 

Joined: Thu Jun 09, 2011 6:39 pm
Posts: 736
Location: Narooma NSW Aus
Jim wrote:
And you don't have a 6.75 mm bit in your modern shop? I have one here. :P

I just looked at my dinosaur collection and Ive got a 6.75 to but it reads 17/64ths , :clap:
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Jim
 Post subject: Re: drill and tap size
PostPosted: Thu Apr 12, 2012 11:01 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
:lol:

Very good.

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Nigel72iv
 Post subject: Re: drill and tap size
PostPosted: Sat Apr 14, 2012 6:08 am 

Joined: Thu Jun 09, 2011 8:26 am
Posts: 399
Location: Melbourne, Australia
Why not just use a thread insert- Heli Coil etc?
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