Sockolet A Sockolet is the same basic design as a "weldolet" or "threadolet" where the major difference is that a Sockolet has a socket for welding versus a buttweld connection that a Weldolet has. This makes a 90° branch and comes in full size or reducing for a straight piece of pipe. Sockolets are available in Class 3000, 6000 and 9000 for high pressures. Design as per MSS SP-97, BW as per ASME B16.11.