As of 2016, CNCExpo.com and MachineToolHelp.com list tables of metric torque bolt specifications. Both sites list torque specs for grades 8.8 and 10.9 hex bolts and a grade 12.9 socket head cap screw.
CNCExpo.com's metric torque bolt specs table lists torques for selected thread sizes and thread pitches from M5 to M36. The table shows torques in foot/pounds or inch/pounds and for dry or lubed application for each fastener, with lubed meaning clean bolts oiled with a medium thickness machine oil. MachineToolHelp.com lists some torque specs in foot/pounds for selected thread sizes between M4 and M30 and bases the figures on different factory bolt specification settings.