WNRFSORFSWRFWNRJ Flanges: Forged Carbon Steel Alloy Steel Stainless Steel; Studs: ASTMA193 Gr.B7A194 Gr.2H ( Other materials on request ); Gaskets: CAF, Spiral wound, Teflon, Graphite ( Other materials on request ) ISO 5167 BS EN ISO 5167-1 LK SPINK AGA3 ASME