M2.5 Square Weld Nut

六角焊接螺帽

六角法蘭尼龍螺帽 

a) This metallic nut features a flanged base with serrated grooves encircling its body.

b) This part is used for secure fastening in mechanical assemblies, with features designed to resist loosening under vibration.

c) The external structure, the serrated grooves or knurls, enhances grip for improved stability. 

Steel two pieces hex collar cap nut

Steel closed end cap nut two pieces brass color 

Carbon steel hexagon thin nut zinc finish