M18-1.5 Extra Fine Thread Hex Jam Nut ~ 0.5d High DIN 439B, Class 04, Plain Finish (no rust protection)
NCL735-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN439B.gif
40.39
362.98
2
40.39
50.00
pcs
362.98
600.00
pcs

DIN 439 B Specifications