DS EN 1514-4:1997 Flanges And Their Joints - Dimensions Of Gaskets For Pn-Designated Flanges - Part 4: Corrugated, Flat Or Grooved Metallic And Filled Metallic Gaskets For Use With Steel Flanges Defines the dimensions and marking of IBC (inside bolt circle) corrugated, flat or grooved metallic and filled metallic gaskets for use in conjunction with flanges complying with EN 1092: part 1 for P