The difference is plating of center contact and shell.
Center contact / Shell
UM-R-PC-1(40): Gold plating / Nickel plating
UM-R-PC-1(41): Gold plating / Gold plating
UM-R-PC-1(40) is our standard.
Center contact / Shell
UM-R-PC-1(40): Gold plating / Nickel plating
UM-R-PC-1(41): Gold plating / Gold plating
UM-R-PC-1(40) is our standard.
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