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Made in Germany, so it has to be metric - right? Cox_ba12




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Made in Germany, so it has to be metric - right? Empty
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Made in Germany, so it has to be metric - right? Empty Made in Germany, so it has to be metric - right?

Post  rsv1cox Tue Jan 23, 2018 7:29 am

Went to the hardware store yesterday looking for a Taifun intake assembly nut and used one of those fancy displays with all the SA/Metric sized sample nuts. I tried using every conceivable SAE/Metric course/fine samples and nothing worked. Closest I could come was M8 which was too loose, M7 wouldn't even go. Nothing SAE either.

Can't be JIS or Whitworth, so something strange German or maybe specific to Taifun?

Made in Germany, so it has to be metric - right? Taifun16

Made in Germany, so it has to be metric - right? Taifun18

Made in Germany, so it has to be metric - right? Taifun17

External size of the nut doesn't matter, I can always grind/file the face down.

Bob
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Made in Germany, so it has to be metric - right? Empty Re: Made in Germany, so it has to be metric - right?

Post  Surfer_kris Tue Jan 23, 2018 7:37 am

I would guess that it is not a standard thread.
Have you measure the diameter and pitch?
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Post  rsv1cox Tue Jan 23, 2018 7:46 am

Surfer_kris wrote:I would guess that it is not a standard thread.
Have you measure the diameter and pitch?

Thanks Kris, It's probably pretty specific as it has a venturi screen on it. I would be quite happy with just a nut so I could get it running.

Made in Germany, so it has to be metric - right? 5b5fe210
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Post  getback Tue Jan 23, 2018 8:13 am

Its probably British 1/2 thread pitch ? You may have to either have one made DYS or find a better upper on the Bay for less $E$ and use it for parts .. here is a chart that's a pain to use . https://mdmetric.com/tech/tict.htm Doh!
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Post  Jason_WI Tue Jan 23, 2018 8:29 am

There are many non standard thread pitch listed out there. For example the TD .020 Venturi thread pitch is one that was used on Singer sewing machines.
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Post  KariFS Tue Jan 23, 2018 8:43 am

How about BSC? BSC is a thread system used in bicycle industry. Also known as CEI standard.

Would 5/16" / 24tpi be close? That is 7.94mm in metric, so an M8 nut would not be very loose though. But anyway, if you have a bicycle shop nearby, maybe it would be worth a visit?

https://en.m.wikipedia.org/wiki/British_Standard_Cycle
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Post  Levent Suberk Tue Jan 23, 2018 9:22 am

Try 7 mm fine thread.
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Post  OVERLORD Tue Jan 23, 2018 10:48 am

Hi Bob, It is M7 fine indeed. That is M7 x 0,75. Below a page out of the French magazine MODEL AVIA of September-October 1968. It's part of a complete article on the Hurrikan. On top of the page, there's a table with the correct threads for each part:

Made in Germany, so it has to be metric - right? Model_10

It says after "écrou-filtre" 7mm diameter and 0,75 pitch. The HS standard means "high strength".

What do I win??? lol! lol! lol!
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Post  rsv1cox Tue Jan 23, 2018 11:41 am

You win the eerou fltre - Filter nut............ if I ever find it.  Smile

7mm fine?  Wow I swear I tried it several times.  Maybe my fumple fingers let me down..........again.  I shall go back and try some more.

Thanks Lieven and all.

The worst part is, I know that nut is under some workbench somewhere just begging to be found.

Bob
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Post  getback Wed Jan 24, 2018 6:57 am

The worst part is, I know that nut is under some workbench somewhere just begging to be found. wrote:
LOL you gotta hate it when this happens DAMMIT! Just to know your not alone i lost my 2/56 tap after just one use , found the 4-40 but the little one is missing in action tongue
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Post  rsv1cox Wed Jan 24, 2018 7:22 am

getback wrote:  LOL you gotta hate it when this happens DAMMIT! Just to know your not alone i lost my 2/56 tap after just one use , found the 4-40 but the little one is missing in action tongue

Smile Smile

I always look where it isn't.

Bob's law. Look where it is and you will never find it.
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Post  Marleysky Wed Jan 24, 2018 4:47 pm

Made in Germany, so it has to be metric - right? 35ce0a10

Hayes Fasteners for Murphy’s Law applications.
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Made in Germany, so it has to be metric - right? Empty Re: Made in Germany, so it has to be metric - right?

Post  rsv1cox Sat Jan 27, 2018 7:34 am

Love the display Rene, story of my life. Sad

But this is weird, crazy, and ridiculous.  There appears to be no 7mm 1 or .75 pitch fine nut in the universe.  

I went back to the local store and there is a 7mm course nut, but no fine.  Came back home and got on to McMaster-Carr who has everything hardware and found their metric fine nuts go between 8mm and up and 6mm fine and down, but no 7mm.  Thanks Taifun.

I got a couple of 7mm course nuts with the thought of retapping to 7mm fine, but I doubt I have a 7mm fine tap.  A better idea would be to tap out a smaller nut though.

So, guess I will have to put this engine on the scrap heap of life.

Robert..................... Sad
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Post  rsv1cox Sat Jan 27, 2018 10:15 am

Thanks Kris, but a benefactor might have solved my problem. This forum rocks....... Smile

Bob
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Post  Surfer_kris Sat Jan 27, 2018 10:50 am

If you where closer I could have made one for you.
Still possible if nothing else works out...
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Post  Robbasdog Sat Mar 09, 2019 10:49 am

Hi folks, for what it's worth, 7mm threads are common on Vespa scooters and Ducati motorcycles, older ones anyway. Only in 1mm pitch on my Ducati though, don't know about Vespa.
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Post  coxaddict Sun Mar 10, 2019 6:31 am

Ah, the 7mm x.75 pitch nut looks like its used on potentiometers and toggle switches.
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Post  rsv1cox Sun Mar 10, 2019 7:41 am

Well, Thanks to Lieven, one now resides on the back of my Taifun engine.

Bought a can of starting fluid and hope to mix up some diesel and run it this spring.

Made in Germany, so it has to be metric - right? Taifun11
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Post  OVERLORD Sun Mar 10, 2019 9:41 am

rsv1cox wrote:Well, Thanks to Lieven, one now resides on the back of my Taifun engine.

Bought a can of starting fluid and hope to mix up some diesel and run it this spring.

Looking forward to that Bob. The nut is indeed from a potentiometer, the smaller ones.
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