DN100 (4" NB) PN16 CHAMF. FF BACKING RING BORED 116mm ID 12.7mm THK SS 304

Flange inside diameter of: 116mm (B1)
Flange overall diameter: 220mm (D)
PCD: 180mm (K)
Bolt Holes: 8 off 18mm diameter (L)
Flange Thickness: 12.7mm (C1)
Material: Stainless Steel
Grade: 304/L
Standards: EN1092-1
Flange Face: Flat Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
Flat Face, Backing Ring, Backing Flange