Body: Steel, European material property class 5.8 grade,
zinc-plated, nano-passivated finish (silver/yellowish), ultrasonically checked, tensile strength class 5.8 (500 N/mm2)
Type A - without sealing washer
Type AC - with copper sealing washer
Type AA - with aluminum sealing washer
The sealing washers in types AC and AA correspond to DIN 7603 sealing washer, type A (flat sealing washers).