fasteners

Hi, while moving house and disassembling my Baumhaus mobel oak dining table, 2 of the bolt fasteners disintegrated. Can anyone please tell me what these are called and where I can find them? See picture. They slot into a circle and hold the bolt in place to grip against the nut...

I'm aiming to replace the hinge on the door of a Bosch WAQ283S1GB/01 washing machine, with the hinge carrying a part number 9000463344. I have found an equivalent part on eBay, but when I removed the door I found these little plastic fasteners instead of screws. I thought they might be pop...