pretty sure any bolt that has a torque plus deg. is a tty bolt. if i need to do service to a part that has a tty bolt, i just try to find a grade 8 bolt / 10.8 bolt of the same size, and torque it to about double what they ask, before the deg. kinda like the brembo calipers i put on, i put some locktite and torqued them to around 125lb.
from the research i have done on tty bolts. the reason why they are not resued, or only can be tigthend a fixed number of times before it breaks. a tty bolt works kinda like a lock washer in an easy way to explain. a tty bolt changes shape when its tightened. the bolt stretches, then re-hardens at its new stretch. so to say. a regular bolt always wants to return to its original size, due to elasticity. thus a regular bolt is more likely to vibrate loose, because once a regular bolt becomes any tiny amount loose, due to vibraiton or anything else, it will ultimatly be almost finger tight after its first broken free. as with a tty bolt will act more as self locking bolt due to it stretching and reforming.
if you plan to reuse bolt, just buy high quality regular grade 8 bolt and use thread lock and tighten them to spec, and that will work.
