Hi my Name is Joerg from north Germany.
I'm close to start my engine after complete rebuild and I'm wiring up my engine bay right now.
I lost one nut and nothing i have in stock will fit.
Please give me an advice what kind of nut it is an what kind size of thread.

Regards any many thanks
Joerg

 

What year vehicle is this? That will help determine if it's metric or SAE thread.

 

It is 1972 Cutlass Supreme

 

Metric is not fitting

 

Welcome aboaerd

That;s because it isn't metric, It's 7 /16

 

That looks like 1/4-20 USS thread .
A '72 Cutlass does not have metric fasteners .

 

If you don't have access to SAE nuts/bolts etc. I suggest that you purchase a SAE tap and die set. Some sizes will come very close to interchangeable and some that are close can be chased with a tap or die and still have 75%+ thread and therefore serviceable as class 2 by machinists standards. A machinists handbook would prove invaluable for you. I have in the U.S. been in the exact opposite of your situation.

 

Just wanted to reiterate that Charlie Jones above is correct. You will not find ONE nut or bolt or dimension given on a 72 Cutlass that is metric. Back then we built everything here and we didn't DO metric. LOL.

 

The US auto industry started to change over to metric fasteners in the mid seventies .
For a number of years cars were built with both metric and US standard fasteners .
By the mid eighties , everything was metric .

A good investment for you would be to get a small assortment of USS nuts and bolts .
https://www.ebay.com/sch/i.html?_fro...963+oldsmobile

 

I can mail you the correct nut from the UK if you like. 1/4"UNC I think. I have plenty and the correct washers too.

Roger.

 

Hi thank you very much, it was 1/4-20 USS have got it here.