At least not in carry-on. You can, however, check your cattle prod. (Not kidding; check out the link at the bottom.)
I totally get why the TSA has banned most items. There are times, however, that a multi-tool would be very handy when traveling.
- Knife to cut tags from purchase or plastic packaging
- Corkscrew for a wine bottle
- Screwdriver to fix sunglasses or open battery compartments
- Poking device to clear mud from shoe treads
But, they still aren’t allowed in your carry-on. Trust me. I have had a key chain Swiss knife and a corkscrew (that little blade to cut the foil got me on the return trip, but not the outbound) confiscated. In both instances, I was not trying to get away with sneaking something banned on board. I either didn’t realize it was in my bag, or in the case of the corkscrew, naively thought it would be fine.
There is one simple multi-tool that I have always, unwittingly (I swear), managed to get through security. Probably because it would only be good for #1 & #3 above. (I’m still working on the pocket corkscrew without the foil cutter.)