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Bolt Specs

     Can someone help me understand the bolt, nut and washer descriptions 
     in the Audi fiche's. Here are a couple of examples:-
     Designation                        Remarks
     Bolt, hex, HD                      M12x1 5x35
     Bolt, with hex, socket HD          M10x1, 25x20
     Washer                             R10 5x21x2
     I understand the Mxx is the metric size and the number following this 
     is the thread pitch. How about the "HD" is this equivalent to the 
     strength HD=10.9? How about the 5x35 is this the length of the 
     threading on the bolt? 
     Thanks and regards, Mike