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Brief:Flange Nuts Standards: DIN 6923 ASME/ANSI B 18.2.2-1986 ASME/ANSI B 18.16.4-2008 IFI 145 – 2002 ASME/ANSI B 18.2.4.4M-1999 JIS B1190-2005 DIN 6927-1983 ( Prevailing torque type all-metal hexagon flange nut)