REFLECTOR: Taps and drill bits

[gattenby at tulsaconnect.com]

Thanks Joe

On Sat, 8 Sep 2007 23:46:28 -0400
  "Joe Ewen" <Jewen at comporium.net> wrote:
> 1/8 NPT = R
> 1/4 NPT = 7/16
> 3/8 NPT = 37/64
> 
> R = 0.3390
> 21/64 = 0.3281
> 
> Joe
> 
> ----- Original Message ----- 
>From: <gattenby at tulsaconnect.com>
> To: "Velocity Aircraft Owners and Builders list" 
><reflector at tvbf.org>
> Sent: Saturday, September 08, 2007 10:31 PM
> Subject: REFLECTOR: Taps and drill bits
> 
> 
>>
>> I'm not where I can look it up...
>>
>> I know that a 1/8 inch NPT uses  an 21/64 drill bit.
>> What size drill bit do I need for
>> a 1/4 inch NPT?
>> a 3/8 inch NPT?
>>
>> I'm doing sight gauges and sump tank this weekend.
>>
>> Noel
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> 
> 
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