What I don't understand is, why did they stop it at 283 ft lbs? I think it's because it breaks soon after that, they just want you to think it could go well over 300.
283 ft-lbs = 3400 in-lbs
It seems that the tester stopped there because that is what they test them to i.e. what torque they are designed to carry. I don't think it was a test to failure.
