Sorry... I'm an idiot... Grade 8 is not the same as Grade 8.8

[XraytecH]

Bought these because the Grimm Off-Road Kit has been on back order since forever. But I over looked that all these bolts are Grade 8 while the factory bolts are Grade 10.9. The max torque values are significantly lower on these Grade 8 bolts.

Is it safe to assume that, if I followed Grade 8 torque values I would be way below factory spec. If I followed factory spec, I break these bolts.

What should I do?

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[mx5red]

I believe SAE (or imperial or whatever you want to call it) grade 8 is roughly equivalent to metric 10.9.
Might have to buy some new wrenches

 

[XraytecH]

I believe SAE (or imperial or whatever you want to call it) grade 8 is roughly equivalent to metric 10.9.
Might have to buy some new wrenches

DAMN YOU SAE... DAMN YOU TO HELL!!!

 

[whiteglad]

Some metric sizes are close to SAE sizes, but many times you won't get a good, snug fit if you change from one to the other. Also, torque values are very dependent on the lubricant type (or lack thereof) on the threads.

 

[Escape.idiocracy]

Mark the nut/bolt with a paint pen…. ???
Super extra paranoid after the paint pen…. Buy flexloc nuts. ? $10-12 a piece but hands down best nuts out there.

 

[chorky]

https://www.aftfasteners.com/grades-of-bolts-bolt-grade-markings-bolt-strength-chart/

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