The typical rule of thumb on these is try and only use a ratchet as large as the bolt/stud. In this case, a 1/4" ratchet is about right, and could probably be tightened pretty hard and not get over 20 ft/lbs. With a larger rachet then the bolt, you have to be real careful on torques. It is pretty easy to put 30-40 or event 50 ft/lbs on a 3/8" ratchet. That will stretch/snap all but he strongest 4-6mm bolt/stud
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