2004NF E48-054:2004 Hydraulic fluid power - Four-screw, one-piece square-flange connections for use at pressures of 25 MPa and 40 MPa (250 bar and 400 bar).
1998NF E48-054:1998 Hydraulic fluid power. One-piece square flanges with recessed flange head PN 250 and PN 400. Dimensions.