The A4** series refer to all AE441, AE443, AE445 et AE448 series

Downloadable technical specifications below

AE441 serie ( according to D38999/41 )

Hermetic receptacle - square flange mounting with screws

AE443 serie  ( according to D38999/43 )

Hermetic receptacle - jam nut

AE445 serie  ( according to D38999/45 )

Hermetic receptacle - circular solder mount

AE448 serie  ( according to D38999/48 )

Hermetic receptacle - circular weld mount