M20-1.5 Extra Fine Thread Hex Jam Nut ~ 0.5d High DIN 439B, Class 04, Plain Finish (no rust protection)
NCL743-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN439B.gif
18.11
271.44
2
18.11
25.00
pcs
271.44
500.00
pcs

DIN 439 B Specifications