Sorry, I don't know the specific answer for that model. I have the UN55TU8000FXZA. But Samsung's specs say 55-inch models take M8 x 1.25 x 20-22mm screws. I had four extra M8 x 1.25 x 25mm screws from the Rocketfish mount for my old TV. I was able to get close enough to the 22mm specs by adding washers. Here is a link to Samsung's help page that might be useful. I'll copy and paste the relevant info, in case the link doesn't work. I hope this helps.

"If you ever need replacement wall mounting screws this information should help. The length of the screws you need will vary depending on the thickness of the wall mounting bracket, if spacers are being used, or if washers are being used. The thread pitch, regardless of TV size, is always 1.25 millimeters. The wall mount you buy will come with all the screws you need to get it successfully installed, and you should be able to contact the manufacturer of the mount to obtain additional screws if needed. You can also purchase wall mounting screws from Samsung Parts and there is always a universal TV mounting screw kit available as well.

For TVs 19 - 22 inches, the screw size is M4.
For TVs 30 - 40 inches, the screw size is M6.
For TVs 43 - 88 inches, the screw size is M8."

https://www.samsung.com/us/support/answer/ANS00038091/