I dislike them because I have ran into them failing more times than I can count. It always seems like the fail when used in blind applications making the job of removal and repair a giant task.
I suppose you have a better way of putting threads in sheet metal for blind applications? If so, please share with the class so we can all benefit from your superior methodology.
To me there is no reason to use them because the bolt will rust to the nut and the nut will spin.
And like every other bit of mechanical understanding on the face of this planet, be smarter than what you're working on. Use an anti-galling agent or sealer to prevent rust in the threaded connection.
It is not a question of IF, it will fail at what seems like the most inopportune time.
Only if you want it to be so.
If you took a poll of how many people had the nut spin on the removal of their fuel tank, pretty sure you will get a lopsided score card.
My apologies, you have managed to confuse me, not hard most days, but still. The gas tank skid is held in place to retain the gas tank by 7 of the same fasteners, none of which are nutserts or rivnuts. The 4 across the back are the same as the 3 across the front, low shoulder grade 5 carriage bolts with push retainers and captive washer hex nuts.
What are problematic are the frame nutserts. We all know it, we deal with it and yet no one does any prevention. How hard would it be to remove them while they are still viable, slather on some good anti-seize and pop them back in so they stay viable? Nope, we'd rather wait until the barrel rusts to the threads so we twist off the barrel from the flange or break the bolt. No different than folks dealing with bumper bolts twisted off in the weld nuts in the frame. Or stuck unit bearings in knuckles, or, or, or any of the myriad of problems that would be much easier to deal with if we just planned ahead a smidgen. How many bolts would come out of hinges and windshield frames if the owners would pull them when they still can, put a little anti-seize on the countersink and then reinstall.
You may like them and use them for your customers and that is fine.
Has nothing to do with liking them. I understand them, know how to set, use, and install them and fully understand that there is not a better option, or that is until you bless us with what you consider to be the superior method.
You can feel free to recommend them and I will continue to advise otherwise.
It isn't an issue of recommending. It is one of understanding and fully knowing there isn't another better option. (same caveat as above)
