D-Sub Solder Cup Female Socket Connectors MHDB and MHDM Series. A range of MHDB and MHDM Series D-Sub Solder Cup Socket Connectors with Nickel plated front shells and Tin plated back shells with Ø3 mm holes. Insulator material used for these MHDB and MHDM Series D-Sub Solder Cup Socket Connectors is a UL94 V-0 Black Glass filled PBT. The Brass Tin-Gold plated terminals of these D-Sub Solder Cup Socket Connectors are manufactured as follows: MHDB Series: ; 787-3852 787-3852