... /6 to 21-1/4 2.Welding Neck,Loose,Flat,Blind.Threaded Flange 3 ... .2000psi-15000psi 4.API6A Type B Flange Size1/2"-72"TypeWeld Neck, Slip-On, Blind, Socket Weld, ... 2566,2567,2568,2569Long neck welding flangesDin28115MaterialsCarbon SteelA105/RST37.2/C22.8Stainless Steel DIN 17440/1.4301 DIN 17440 ... better. Machine:Application:FBE Coated flanges for the drinking water pipeline as AWWA C210 & BS6920.