17-04-2016, 11:22 PM
A very informative ( boring unless you're into tools ) and well prepared guide by Dundee uni in spanner/ nut/ torque/ socket/ max lever length table designed to keep you your tools and parts safe!
http://www.sat.dundee.ac.uk/psc/spanner_jaw.html
http://www.sat.dundee.ac.uk/psc/spanner_jaw.html