DN50 PN25/PN40 RF BOSSED SLIP ON FLANGE CS S235JR

Flange outside diameter: 165mm (D)
Flange inside diameter: 61.5mm (B1)
Flange thickness (C2): 20mm
Pitch Circle Diameter (PCD): 125mm (K)
Hub height: 34mm (H1)
Neck diameter: 84mm (N2)
Raised Face Diameter: 102mm (d1)
Height of Raised Face: 3mm (f1)
Bolt Holes: 4 off 18mm 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