M12-1.5 Fine Thread Non-Serrated Hex Flange Nut DIN 6923, Class 8, Plain Finish (no rust protection)
NRC706-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN6923.gif
55.08
506.36
2
55.08
80.00
pcs
506.36
900.00
pcs

DIN 6923 Specifications