Originally Posted by Bryan Lawrence
Funny enough, the only thing I could find was my flare nut wrench that was 5/8, the thing was so tight that I just ended up using the vise grips with lots of heat though.
Not sure if it had 8.8 or anything like that, what does that mean?


The numbers or symbols indicate the grade of the bolt. The higher the grade, the higher the strength of the bolt.

Metric bolts use numbers, SAE bolts use lines/symbols.

Here are some examples:

http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx

http://www.engineeringtoolbox.com/steel-bolts-sae-grades-d_1426.html

'92 Talon TSi AWD - 5 Speed/E16G/12.385s @ 115.13mph