M16-1.5 Fine Thread Non-Serrated Hex Flange Nut DIN 6923, Class 8, Plain Finish (no rust protection)
NRC724-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN6923.gif
23.53
230.95
2
23.53
25.00
pcs
230.95
300.00
pcs

DIN 6923 Specifications