Tapping size

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Date

01-27-2008

Posted by campingstoveman on January 27, 2008, 6:38 am

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Mark,

No chance :-) my brother builds and races Safari and off road trialers for a
hobby, he likes to try different things and quiet often makes his own parts.
this time he is modifying the steering by making larger dia steering arms,
idea being they wont bend so easily when racing.

Martin P

> wrote:

>> Gentlemen,
>>
>> Can anyone tell me the tapping size of a 11/16ths UNF tap, I know its a
>> bastard size, I have bought a tap but none of my books give a drill size
>> for
>> it.
>> Its for Landrover track rod ends.
>>
>> Martin P
>>
>> --
>> martin.per...@btopenworld.com
>>
>> Semper in Excrementem Altitudo Solus Varius
>>
>> My Photo's
>> :-http://internalfire.com/modules.php?set_albumName=campingstoveman&op=...
>>
>> Also you will find some herehttp://picasaweb.google.com/campingstoveman

>
> It`s 5/8".We manufacture Land Rover track rods,hope your not going
> into competition.:-)
>
> http://www.4allfours.co.uk/sumo.htm
>
> Mark.

Posted by mark@ems-fife.co.uk on January 27, 2008, 6:57 am

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wrote:

> Mark,
>
> No chance :-) my brother builds and races Safari and off road trialers for a
> hobby, he likes to try different things and quiet often makes his own parts.
> this time he is modifying the steering by making larger dia steering arms,
> idea being they wont bend so easily when racing.

Martin,that`s good news.These ones are guaranteed against bending.Made
from high strength hollow bar.I believe it`s in the RAC regs that
solid bar is not allowed which is a pity as it`s infinitely cheaper.We
manufacture for the owner of the brand, who reckons he`s only had to
replace two that bent.Not bad as we supply him with thousands of them
a year.I suspect that a lot of them are never fitted,the buyers being
content with having the Sumo sticker on their windscreen.
Mark.

Posted by Peter Neill on January 27, 2008, 8:02 am

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On Sun, 27 Jan 2008 03:34:18 -0800 (PST), "mark@ems-fife.co.uk"

>wrote:

>> Gentlemen,
>>
>> Can anyone tell me the tapping size of a 11/16ths UNF tap, I know its a
>> bastard size, I have bought a tap but none of my books give a drill size for
>> it.
>> Its for Landrover track rod ends.
>>
>> Martin P
>>
>> --
>> martin.per...@btopenworld.com
>>
>> Semper in Excrementem Altitudo Solus Varius
>>
>> My Photo's

:-http://internalfire.com/modules.php?set_albumName=campingstoveman&op=...

>>
>> Also you will find some herehttp://picasaweb.google.com/campingstoveman

>
>It`s 5/8".We manufacture Land Rover track rods,hope your not going
>into competition.:-)
>
>http://www.4allfours.co.uk/sumo.htm
>
>Mark.

Another useful rule-of-thumb formula is to divide 1 by the TPI and
then subtract this number from the O/D to get an approximate tapping
drill size.
So for example if this was 11/16" x 18 TPI then 1/18 = 0. 0556, then
11/16" (0.6875) - 0.0556 = 0.6319, which is just 0.007" above the 5/8"
drill size recommended by others.

The formula also works for metric as well, but these are so simple
anyway (O/D - pitch) that it shouldn't really be needed there:)

Peter

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