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Bolt Hardness


idreamidrive
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Galant VR-4 org Post #: 1247597 posted 10/28/19 04:13 PM     Remind Me!  Send Private Message   Edit Post      
I think I know that the hardness of the bolt is stamped on the top of the head, but can't find the answer to what the "7" stands for. Snapped the head off the transmission case bolt and trying to figure out if 8.8 hardness will work just fine, or if I need to special order a 10.9 hardness bolt. I am pretty sure the torque spec is 29 ft-lb and I would think an 8.8 m10 bolt would be fine, but want to make sure. I searched, it keeps coming up as "whats the difference between a 6 bolt and 7 bolt....", but maybe my google skills could use some help.

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iceman69510 Galant VR4.org Moderator
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Galant VR-4 org Post #: 1247604 posted 10/29/19 07:41 AM     Remind Me!  Send Private Message   Edit Post      
No, it's tough to find JIS bolt information. Everything out there is ISO. The 7 is the tensile strength rating, in Megapascals.

I talked to the fastener guy at work for you this morning, and he said to use the 8.8, not higher.



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idreamidrive
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Galant VR-4 org Post #: 1247614 posted 10/30/19 01:02 PM     Remind Me!  Send Private Message   Edit Post   
Thank you

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