If you have to pay attention to the specifications of the USB base, there will be noticed that the solder wire TYPE USB base is almost all with a jacket, especially the USB-AF base, this is also a characteristic of the solder wire TYPE USB base is different from other USB-AF base, there are a lot of customers to consult, put forward not to this plastic or hardware shell, When the product is in trial production, they will come back to contact to install the sheath (plastic or hardware). Originally, they need to use the punching process in the trial production, while the traditional USB-AF socket hardware shell is with 6 stamped shrapnel, where there is shrapnel, there is an opening. In the process of glue will have plastic particles and powder into the solder wire TYPE USB socket internal (is commonly referred to as residual glue), light affect the USB socket plug performance, serious will affect the electrical performance of the product. And here, we can solder wire TYPE USB socket sheath function self-evident, yes, through plastic or hardware coat can effectively eliminate products in the process of glue residue into the USB socket inside, and the reason why solder wire TYPE USB socket use sheath more, Just because the use of solder wire type USB socket products are generally wire type, must be dealt with. But also not to say that only solder wire TYPE USB mother need jacket, other specifications such as sticking or splint TYPE USB mother sometimes also use the jacket (some products will also use the glue process), the above is the main reason for solder wire type USB mother to install the jacket.