"Dom" wrote in message
...
Grade 10.9

Ultimate Tensile Strength 10MPa
Carbon Content 0.9%

This is a very strong bolt. If your application calls for a high
tensile bolt then this is a good choice. You could go for a Grade 12,
but this might be overkill. If the nuts are old, you should think
about getting new ones.

HTH Dom.

I agree! My nuts are getting old and I'm thinking about getting new ones...