DIN 928 - Square Weld Nut

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. 

ISO 4035 / DIN 439B

Steel two pieces hex collar cap nut

Steel closed end cap nut two pieces brass color 

Carbon steel hex collar weld nut heat treated