Anyone ID this missing bolt size

[Last Flight Out]

Have a very basic question for anyone who knows off the top of their head out there. See pictures below, but I’m trying to identify the correct bolt sizes for both of these mounting points from the old Emissions/EGR that was on my 40. I’m trying to make a mounting bracket for something else and the bolts that I thought were the correct size are getting very tight after two turns - even with anti-seas on them.

Just want make sure that I don’t start to stir out the threads on the engine block. Many thanks in advance.

 

[charliemeyer007]

2 turns its the wrong thread pitch. Any hardware store will have a nice assortment of metric stuff. Buy a nut and bolt in each size and mark the size on the bag. Or you can buy a checker kit.
https://www.amazon.com/Stalye-Nut-Bolt-Thread-Checker/dp/B098NGLX5W?tag=ihco-20

 

[mattressking]

M8x1.25. These are Japanese trucks so they use standard JIS, so nearly everything will be fine thread pitch.

Nearly every bolt will fall into the following category:

M5x0.9
M6x1.00
M8x1.25
M10x1.25
M12x1.25

There are some variations for driveshafts depending on year (M10 vs M11). But for all intensive purposes, above usually hits it all. Try to skip store bought hardware, buying direct from Toyota is usually the same or cheaper and 10x better hardware (i.e., captured flat/lock washer and JIS head bolt).

 

[Last Flight Out]

M8x1.25. These are Japanese trucks so they use standard JIS, so nearly everything will be fine thread pitch.

Nearly every bolt will fall into the following category:

M5x0.9
M6x1.00
M8x1.25
M10x1.25
M12x1.25

There are some variations for driveshafts depending on year (M10 vs M11). But for all intents and purposes, above usually hits it all. Try to skip store bought hardware, buying direct from Toyota is usually the same or cheaper and 10x better hardware (i.e., captured flat/lock washer and JIS head bolt).

Thanks ma! Saving this post for future wrench turning!

 

[Howl]

Check em... on my '76 FJ40 those are M10x1.25

 

[B y r o n]

The question about bolt and nut size comes up quite a bit around here. We're also working on repairing/replacing different items requiring nuts and bolts that require cleaning. My suggestion is to find a decent set of thread chasers and kill two birds with one stone. Not only do you get a tool to clean the threads of the nuts, bolts, or tapped holes you're dealing with but you also get a tool that can help you identify what thread/pitch of a fastener or tapped hole you're unsure of.

 

[charliemeyer007]

$40 thread chaser https://www.amazon.com/VEVOR-Thread-Chaser-Set-Rethreading/dp/B0DJ8D4K8D?tag=ihco-20
$20 thread checker https://www.amazon.com/Nut-Bolt-Thread-Checker-44/dp/B0CSKBMD76/?tag=ihco-20