Brithish Bolt Head Meaning


This picture is of the 3/4-16 bolts head which fastens the lower carage to the frame of my XJS.
Asking if anyone here knows the equivalent strength of this bolt. Have found source for a grade 5 but not a grade 8. Thanks for your help.

R O is Rubery Owen, the manufacturer. S is the strength but I can’t find a conversion chart that definitively says the modern equivelent is 5 or 8. Maybe you can. It’s in the suspension, it’s gotta be an 8. McMaster Carr, Fastenall, or SNG Barratt for weird stuff, and prepare to pay up!

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Better safe than sorry as they say so ordered two each of Grade 8 bolts and grade 8 lock nuts from McMaster Carr today out of Atlanta Georgia. Bolts are $9.55 each and a bag of five fiber lock nuts where $8.16 plus about $13 in freight. Part Numbers are 91257A884 for bolts and 97135A285 for bag of five nuts. Hope this helps some down the line.
Thanks again for all your help.