M14-1.25 Extra Fine Thread Hex Jam Nut ~ 0.5d High DIN 439B, Class 04, Plain Finish (no rust protection)
NCL713-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN439B.gif
21.1
820.05
2
21.1
25.00
pcs
820.05
1300.00
pcs

DIN 439 B Specifications