[Healeys] BSF Taps and Dies

[Bob Spidell]

My (somewhat limited) experience is that the so-called 'dies' are really 
only thread chasers. If you try to use them to actually thread, say, a 
pipe or rod the die will wander laterally and you won't get a straight 
thread. I don't know if actual 'dies' are available outside a machine 
shop but, probably the only way to get a straight thread is with a lathe.

On 5/13/2020 6:49 AM, Bob Haskell wrote:
> Tom,
>
> If the pipe is 1/2" outside diameter, then a 1/2"-13 UNC or 20 UNF die 
> would be used.  Pipe is usually given by the inside diameter and 
> normally has tapered threads (NPT), in the US.  A 1/2" pipe would use 
> a 1/2" NPT die which is much larger than the 1/2"-13 or 20 dies.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 5/13/20 7:12 AM, Tom Felts wrote:
>> Totally off Healey content, but here is a stupid question Re. dies.  
>> I have a piece of 1/2" OD steel pipe I want to thread (the outside).  
>> I don't know the die size to use.  A 1/2" die seems way too small.  
>> Anyone know what size die to use?  the number of threads doesn't 
>> matter---just the size of the die.
>> Thanks
>> Tom
>>
>> ----- Original Message -----
>> From: Michael MacLean <rrengineer.mike at att.net>
>> To: 'Healeys' <healeys at autox.team.net>, simon lachlan 
>> <simon.lachlan at alexarevel.plus.com>
>> Sent: Wed, 13 May 2020 02:51:28 -0400 (EDT)
>> Subject: Re: [Healeys] BSF Taps and Dies
>>
>>
>> I just want them to clean up threads.  Should be adequate for that..
>> Mike M
>>
>