DIN 71752 Fork Head, Steel
Size d1= 12 is supplied with a fine thread M12 x 1.5 according to DIN. In practice, however, M12 x 1.25 is preferred.
Size d1= 20 is available in addition to the DIN standard.
See also GN751.1, steel fork joint with rotating shaft.
Steel, zinc plated, blue passivated.