DN400 PN25 RF BOSSED SLIP ON FLANGE CS S235JR

Flange outside diameter: 620mm (D)
Flange inside diameter: 411.0mm (B1)
Flange thickness (C2): 40mm
Pitch Circle Diameter (PCD): 550mm (K)
Hub height: 78mm (H1)
Neck diameter: 472mm (N2)
Raised Face Diameter: 505mm (d1)
Height of Raised Face: 4mm (f1)
Bolt Holes: 16 off 36mm diameter (L)
Material: Mild Steel
Grade: S235 JR
Standards: EN1092-1
Flange Face: Raised Face
Certification Available: 2.1 BS EN 10204 Material Certification

Alternative terminology:
Bossed Slip on Flange, Weld on, Mild Steel, Carbon Steel, Raised Faced, SOB