... ETC. 3.Standard:DIN JIS BS UNI EN1092-1KS Flanges of welding neck, socket welding, threaded, blind, slip on, ... 2500 (complete range). Flanges from 26" to 48" and classes 150 to 900 lbs are in accordance with MSS ... long welding neck are from classes 150 to 2500 lbs and sizes from 1/2" to 24". Orifice flanges from 1 ... Depending on special purposes, flanges can be manufactured in different shapes and sizes