That is interesting. I do know that nylon straps used in construction are checked for condition and have a red stripe embedded in the woven material. When the wear gets to the red stripe the straps are removed from service and cut in half to prevent them from being used elsewhere. But there is no time limit on the life of the nylon straps, just a wear limit. There is not weight check required either, just the wear limits.

So if your nylon bolts are in good condition keep on using them.

Question, do you change out the wooden blocks that the screws go into? Do you recycle the glue joints that hold the piece of wood that has the blind nuts or even the wood threads in some applications? If you cycle out the bolts maybe you should check those out too. Shouldn't you remove the mounting piece and install a new one? Do your replace all the control horns and clevis made of nylon too? Do you replace the nylon fibre glass filled motor mounts?

Think about it.

Cheers,

Chip

OOPs a repeat, sorry.