Hardware Grade Change

[rs-vic]

Can anyone tell me what year the hardware grade changed from 8G to 8.8, 10K to 10.9, etc.? Best I can find are two DIN papers, one from 1965 showing the old grade and one from 1979 showing the new grade. I have narrowed it down to late 60's to early 70's. Maybe some of you guys can look at your original cars and let me know. Thanks, Vic

[rs-vic]

I am restoring what is left of a 67 911. What looks to be still original has the early hardware. Today I looked at an all original 1974 VW Bus, it has the later style 8.8 hardware.

[rs-vic]

Ok, let's take it one step further. I was sorting through some hardware I recently had replated and came across three better bolts. Looks like it went from 8G to 8 8 to 8.8. So with the 8G on a 67 and the 8.8 on a 74, the 8 8 must have been for a very short time. Let's try to figure out what years this happened.

[Jon B]

Can anyone tell me what year the hardware grade changed from 8G to 8.8, 10K to 10.9, etc.?

Vic, hardware grades such as 8.8 and 10.9 are ISO metric property classes.
I don't think there was a specific date or year when all hardware grades changed to ISO, but instead a gradual phase-out of some DIN standards by German manufacturers.

Yes, DIN-graded hardware was still in use when your 67 was built. I have DIN-graded elastic bolts (KAMAX 8G) unique to Simplified Differentials, which weren't used prior to 68.

Jon B.
Vista, CA

[Jon B]

Let's see what Pelicans have to say about this...

http://forums.pelicanparts.com/porsc...de-change.html

Jon B.
Vista, CA

[ejboyd5]

Jon B. is correct in that the change from DIN to IOS nomenclature was a gradual thing with no enforced implementation date - so much depended upon the country and the particular standard that was involved. I recommend an internet search for DIN and ISO. There is much information available on the history of the ISO movement and, as always with the internet, I leave it to you as to which items to trust and which to discard.

[72targa]

We'll get to Bloomington Gold level of Concours judging yet!...

[gled49]

I recently finished a 68 911R, it was all DIN, 8G, 10K, 12K etc. G.Led

[rs-vic]

Thanks guys. A friend of mine has an unrestored 68L that is all 8G style. So that confirms what G.Led stated. My friend also has one of the last 914/6's, it is a 72 model year and has a mix of early and late, or better, DIN and ISO.

The gradual phase in makes sense. I was also thinking that it could have to do with inventory vs. demand. A small company like Porsche at the time might need much longer to deplete inventory than VW.

So now maybe someone with a 69, 70 and 71 can chime in on what is on their cars.

Vic

[Jon B]

Here's another car for reference.

I looked over my 72 BMW, which has had one exterior repaint but has never been restored, and all the hardware I could see is ISO graded.
It was the German hardware industry that gradually changed their products to ISO metric standards, not the German car manufacturers that purchased their products.



Jon B.
Vista, CA