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important work
Care to define that?
I don't pretend I can apply torque more repeatably than a cheap torque wrench. But I'm damn sure I can guess the friction component of the required torque to achieve a given tension better than a one size fits all assumption.
Kimmo-
Care to define that?
Aerospace, automotive, construction, pretty much any precision manufacturing.
I'm damn sure I can guess the friction component of the required torque
You really can't. Your calibrated hand is just guessing how much force you're applying, and like a torque wrench it can't diffentiate the components which make it up.
gbj_tester
Nearly everybody who is doing important work with threaded fasteners uses a torque wrench, based on known tribological conditions to convert the desired tension into a torque to be applied. The only exceptions are the people doing more direct tension measurement by observing strain. Nobody who knows anything thinks that they can apply torque by feel more repeatably than even a cheap torque wrench.