A weld nut is a special type of nut specifically designed to be welded to another object. There are various types for different applications.

Size:  M4-M16      

Width across flat: as per size

Thread type: metric corse/fine right-hand thread

                     imperial thread is available upon request

                     left-hand thread is available upon request

Material: steel

Grade: 4.8/6.8/8.8/10.9/12.9

Finish: plain

Technical info: DIN 928