Thought I'd repost this wrench strength test. It's in German but pretty self-explanatory. Maul is the open end. Hazet did best among the premium brands but clearly price is not a determinant of strength. The 1 euro Indian wrench was as strong as the 2 Snap-on.
http://wiesemann.eu/_UPLOAD/files/Oldtimermarkt.pdf
The Japanese test results elsewhere had Nepros ahead of all of the premium western brands although obviously strength is only one measure of a tools worth.
To be honest you're going to have a hard time putting 100Nm on a normal length 13mm wrench by hand, unless it happens to be a really long. For example the Hazet 600N-13 is 193mm long (which is already longer than a lot of others in the test): so if you get a good grip on the wrench with one hand you have an arm of maybe 15cm with respect to fastener, meaning that you have to put a force of about 666N (145lbs) on it to reach a torque of 100Nm. That's already going to be painful on your hand, let alone going to 200Nm or above.
No didn´t know that










