Stainless steel tee has three types:BW,SW,THD.These are threaded tees in the picture.Threaded fittings have pressures:CL2000,CL3000,CL6000.
Stainless steel sockolet is belong to forged pipe fittings,the most used pressure is Class3000.In addition,there are also class6000,class9000 for the stainless steel sockolet.