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GR 55 Anchor Bolts

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I have an anchor bolt in stock that is marked GR 55 that I may be able to use 
on a project. I don't have an ASTM number or any other markings aside from GR 
55. I would appreciate any info from anyone who is familiar with these "GR 
55" anchor bolts. 

Thank you!

Rainier C. Catubig, P.E.
San Diego, California