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PostPosted: Wed Oct 21, 2020 3:49 pm 
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Joined: Sat Jan 11, 2020 12:55 pm
Posts: 167
Car Models: 1972 99L 2 door
Large nuts on each end of the wishbone that hold it into the bush housings. 1972 Saab 99.

I've got the part number of 7904097 but the description just says 'nut' and the internet says nothing :roll:

Does anyone know what size this is please?

I've tried a thread gauge and measuring outside dia of the wishbone threaded section but can't quite come to an answer and it is 15.7mm dia across the top of the thread. The thread looks like 1.5mm pitch but that gauge doesn't quite sit down nicely so I am not sure it is that and 1.75mm is way off. Its an early car where most things are imperial so I'm thinking the thread may be a something and 5 something thou.

Im thinking it is M16 fine (1.5mm) but would appreciate someone who knows confirming for me due to the thread not fitting properly on my gauge.

Cheers!


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PostPosted: Wed Oct 21, 2020 4:31 pm 
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Arkwright.
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Joined: Sat Jan 20, 2007 6:33 pm
Posts: 51370
Location: NETTLEHAM, LINCOLNSHIRE
Car Models: 1981 99 Turbo, Jaguar XF Sportbrake, FIAT 500 TwinAir
Moved to the Classic Workshop from Parts Wanted.

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When you think you know it all, it's a sure sign you don't.


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PostPosted: Wed Oct 21, 2020 6:16 pm 
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Joined: Sat Jan 11, 2020 12:55 pm
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Car Models: 1972 99L 2 door
Didn't even realise I'd put it in wanted! I do kind of want something though... To find out what size my nuts are. :geek:


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PostPosted: Wed Oct 21, 2020 8:00 pm 
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Full Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 745
5/8 unf?
5/8" (0.625 inch) is 15.875 mm
5/8 unf is 18 TPI (threads per inch) which I think works out at 1.4mm pitch?
So looks fairly close to your measurements


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PostPosted: Thu Oct 22, 2020 6:22 am 
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Joined: Sat Jan 11, 2020 12:55 pm
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Car Models: 1972 99L 2 door
Thanks Pete, that does sound more right than being m16. The thread pitch was so close to being 1.5mm and 1.4 is probably what it was. I reckon I'm going to need an imperial thread gauge as I get to know 70s engineering!


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PostPosted: Thu Oct 22, 2020 8:04 pm 
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Saab Nut

Joined: Mon Dec 21, 2009 8:08 am
Posts: 1271
Car Models: Saab 99
On my 99 (MY80), the nut is indeed a 5/8 UNF (18 tpi)

I got bored one day and measured & catalogued almost every nut, screw, bolt, washer on the 99.

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99 (not a T16 any more) in a special kind of brown


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PostPosted: Thu Oct 22, 2020 9:03 pm 
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Joined: Sat Jan 11, 2020 12:55 pm
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Car Models: 1972 99L 2 door
Excellent thank you!

You must have been bored to catalogue all that lot but it certainly pays in the end when you need to replace something and need the info to round up nuts and bolts.

I shall be placing an order for those nuts and associated washers in due course


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