How much torque should be used when tightening bolted connections?

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You should use bright galvanized screws and nuts with a strength grade of at least 8.8 or a performance grade of 70 (ISO 3506) (for stainless steel screws and nuts).

screw	FZB, (8.8) Nm	- Stainless steel grade 70 nm	Stainless steel grade 80 nm
M5	5	4	5
M6	9	7	9
M8	21	17	22
M10	41	33	44
M12	70	57	75
M16	170	140	180
M20	340	270	350