A socket weld and threaded cross is a type of pipe fitting that is used to connect four pipes in a plane with 90 degrees between each threading The fitting has a socket on one end that is welded to the pipe and a threaded end on the other end that is screwed into the pipe Socket weld and threaded crosses are typically made of carbon steel stainless steel or alloy steel Here are some of the product description and technical specifications of socket weld and threaded cross Material Carbon steel stainless steel alloy steel End connections Socket weld and threaded Class 150 300 600 900 Size 12 4 Inch Thread NPT BSP BSSP Pressure rating 150 psi 300 psi 600 psi 900 psi Temperature rating 20F to 450F 29C to 232C Dimensions Varies depending on the size and type of fitting