Battery clamp nut size (photo)

[markeaton]

For the life of me I just can't seem to get the right size nut on the bolt that holds the battery clamp in place. 1973 standard beetle.

Any idea?

Thank you
-Mark

[slalombuggy]

M8x1.25 is the factory thread size

[markeaton]

Thanks... I tried that, but didn't work. I'm guessing the PO must have swapped something out. I ran out of a few different M sises and will buy more. I'll try some Standard sizes too.

Thanks

[vamram]

[markeaton]

Hi Vamram-... i did the unthinkable... I went to Lowes. Bought 15 bags of all kinds. Took the time to try one of each. Nada.

So I did put on a M8 x 1.25 as slalombuggy suggested. Came very close, but not perfect, so I did in fact tighten on.

I put some anti-seize lube on there so when my new battery dies in 4-5 years (I'm in cold NH), I can remove again.

[Cusser]

On one of my VWs, the stud broke off, over 35 years ago. I drilled a hole and inserted a bolt through from underneath, secured that in place on the pan with a nut, and then used a nut to hold down the battery mount.

I can't remember whether I stayed 8mm or did 5/16 inch, it's been so long.

I also didn't remember to retrieve the Vise-Grips I had locked onto the bolt head underneath the pan while tightening the securing nut, "found" it still there a month later.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[markeaton]

Hi cusser , I never even thought about looking underneath to see any evidence of a drilling or different bolt put in. Now I’m curious.

[Cusser]