... WN, SW, Threaded, Lap Joint, Ring Joint.4.JPI Standard: SO, WN, SW, Threaded, Lap Joint, Ring Joint.5.Nonstandard FlangesThe certificate of ... Engineers, and we also have a lot of high precision testing equipment. such as: three coordinate measuring system, spectrograph, Optical ... a lot of the high precise Machining equipment and high precision testing equipment, our manufactory also have a large number ...