The set consisting of 8 bolts – 8 nuts – 16 washers is used for joining the backing flange sliding on the HDPE flange end with the gate valve or ball valve flange. The bolt length does not allow joining with wafer-type butterfly valves. Technical characteristics: galvanized hex head bolt: Class 8.8, DIN 933, ISO 4017, STAS 4845. Galvanized hex nut: Class 8, DIN 934, ISO 4032, STAS 4071. Galvanized flat washer: DIN 125, ISO 7089, STAS 5200/4.