Bkl sma adaptors sma and rp sma gold plated contacts gold or nickel finish bkl 0419119 bkl electronics 0419119 this is an inline adaptor with a female reverse polarity sma connector to a reverse tnc socket rp tnc or rtnc gold plated brass body with gold plated contacts reverse polarity refers to the mechanical arrangment rather than the electrical signals these connectors have a central pin instead of a socket but still have an external thread bkl 0419119 sma adaptor sma reverse female