M20 x1.5 HEX HALF/THIN NUT BRASS
The half nut (also known as a jam nut) is a thin nut, normally used under a full nut to develop locking action
Metric Fine Thread
Thread Pitch = 1.5mm
Hexagon Across the Flats ( AF ) = 30mm
Thickness = 10mm
Mild Steel
DIN Standard 439B
Material = Brass