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You can produce anything you want, and call it whatever you like, but if there is no standard to back it up, it may as well have come from a sweat shop in China.

Again, there is no ASTM or ANSI standard for L9. It is a trademark. As to the referenced ANSI (A574) standard, yes it has a higher ield and tensile strength han grade 8, but is strictly referencing socket head cap screws, not hex bolts. Kastein has the right idea, in that he is trying to...

The problem with those "Stronger than Grade 8" bolts is there is no standard to back it up. ANSI and ASTM have only specified for a Grade 8. and I quote "Engineer's Edge" "Grade 12" is not a valid material condition or 'call out' to SAE, ASTM, or ASME specifications.Grade 8 is the highest...

9 or 10? Umm, 8 is as good as it gets, SAE & ASTM Bolt Grade ID Marks & Properties Reference Table - Engineer's Handbook