a325 low temperature service a320
 

a325 low temperature service / a320
i realize a325 hardware is not considered appropriate for low temperatures, however i was curious if anyone could point out the lowest service temperature for a325 bolts. i have not been able to locate the acceptable temperature range for a325, just that they should not be used in low temperatures. low temperatures is kind of a relative descripion. what point should i switch to a320 hardware.
thanks in advance.