Slip-on flange is the full name of necked flat welding steel pipe flange. It is a flange that connects steel pipes, pipe fittings, etc. to equipment or pipelines through fillet welds. Slip-on flange is also a plate flange with a neck. The short neck improves the strength of the flange and improves the bearing capacity of the flange. Therefore, it can be used on pipelines with higher pressure.