[numpad0]

Fibers can be bent to a radius of an inch or so, that's the tolerated minimum bend radius.

I guess you could call it "the maximum sharpness tangency" or something like that, but that's not the standard verbiage.

[DannyBee]

G.657A1, which is basically the crappiest you would ever buy at this point, is not even half an inch bend radius.