... /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, Lap Joint ... flangesDin2565,2566,2567,2568,2569Long neck welding flangesDin28115MaterialsCarbon SteelA105/RST37.2/C22.8Stainless Steel DIN 17440/1.4301 DIN 17440/1 ...