What is the difference between UG-657/U(40), UG-657/U(41)(Scheduled to be discintinued) and UG-657/U(42)(Scheduled to be discontinued)?

Modified on Fri, Jun 26 at 12:47 PM

The difference is plating.
UG-657/U(40) : Silver plated contact, partial silver plating shell
UG-657/U(41) : Silver plated contact, nickel plated shell(Scheduled to be discontinued)
UG-657/U(42) : Gold plated contact, nickel plated shell(Scheduled to be discontinued)