... weld neck flange1.specificationStandards: ANSI(ASME), AWWA, DIN, EN1092, GOST, JIS, BS, UNI, SABSType: welding neck, slip on, bind, threaded, lap-joint ... type: FF(flat face), RF(raised face), RTJ( ring type joint)Coating: anti-rust oil, black paint, transparent yellow ... WN 1/2"--24" 150-2500LBS Long welding-neck A105, A350LF2,A182 F304/F304L,F316/F316L 3 ... .picture ansi b16.5 class 150 weld neck flange