GB/T 9114 PN2.5 Threaded flanges

　　Threaded flanges look very similar to Slip-On flanges but the main difference is that thethreaded flange has been was bored out to match a specific pipe inside diameter. The backside of this center opening is then threaded with the relevant-sized tapered pipe thread.

　　Threaded Flanges can be used in very high pressure services and their major advantage is that they can be assembled without welding.