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you torque all the bolts in sequence to 45ftlb then tighten them another 45 degrees (full sequence) then another 45 degrees (full sequence) if you know what i mean
but please bear in mind that this is with a 150mm long 12.9 rated m10 cap head bolt. i prefer to use these as they are re-usable as they are not stretch bolts but cost about the same as a stretch bolts
they normally cost about 12 quid a set up here in the north-east 1.50 a bolt