... and so on for stainless steel Blind flange7Sealing surface:FF ,RF, LJ, FM ,R.T.J ,R.J and so on .8Production ... Neck, Blind, Socket Welding, Threaded, Lap Joint , Plate, etcFacingRF, FF, FM-M, T-G, RJ, etc.FinishTransparent oil, rust-proof oil ...