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Re: GR 55 Anchor Bolts

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It is possible  that your HD bolt is to a British Standard BS4360.  Steel grade 55 to this standard is generally used in the fabrication of rolled steel sections, flat bars and round and square bars.  It is not a bolt material specification but it is not unknown for contactors to manufacture long bolts from this material for specific uses, eg lattice tower holding down bolts.

Mechanical properties for round bars are:

Grade       Tensile                            Yield Strength
                 Strength     <=16mm     >16 to     >25 to    >40 to
                                                       25mm     40mm     63mm

55C         550/700        450               430         415        -           
55E         550/700        450               430         415       400

Units are MPa.

I hope this helps.