M10-1.0 Extra Fine Thread Hex Jam Nut ~ 0.5d High DIN 439B, Class 04, Plain Finish (no rust protection)
NCL691-500
https://www.fastenermart.com/mm5/graphics/00000001/DIN439B.gif
3.27
244.26
2
3.27
25.00
pcs
244.26
2500.00
pcs

DIN 439 B Specifications