Nominal Size: M12
Thread: 1.75mm Pitch (Coarse)
Width Across Flats: 18mm
Height: 12mm
Flange Diameter: 20mm
Material: Steel
Finish: Zinc
Hardness: Class 8
Style: Serrated
Type: Flange Nut
Specifications: DIN 6923

Box of 6.

A flange nut has a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.