STAINLESS STEEL FORGED FLANGES OIL SERIES Types Welding Neck Slip on Blind Lap-joint Orifice Welding Neck Standards/Grades NFE 29-203 / 29-204 BF Z3 CN 19-09 and BF Z3 CND 17-11-02 ASTM A 182 F 304 L, F316 L ANSI B 16.5 Dimensions / Tolerances / Testing (according to Standard) Outside Diameter: ND 15 to 600 / NPS 1/2" to 24" Class: 150, 300, 600, 900, 1500, 2500 Finishing - Certification 3.1 B according to EN 10 204 Accessories - Applications For use with "oil series" pipe and fittings