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Drill bit size for tap

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Old 08-25-2005, 02:20 PM
  #1  
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Default Drill bit size for tap

Need to know what size drill bit to use with an 8mm x 1.25 tap, on the package for the tap it says to use drill bit "H"...what the ---- does that mean lol?
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Old 08-25-2005, 02:31 PM
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Default Re: Drill bit size for tap

google that ----.
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Old 08-25-2005, 02:36 PM
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Default Re: Drill bit size for tap

I googled that ----

http://www.efunda.com/DesignStandard...ewm_coarse.cfm

Maybe "H" = 6.80?
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Old 08-25-2005, 03:25 PM
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Default Re: Drill bit size for tap

use a 17/64 and go slow with the tap

H = .266
17/64 = .2656
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