A hot runner system comprising a side gate nozzle assembly, and the side gate nozzle assembly 108 comprising a nozzle body and at least one side gate nozzle tip assembly; the hot runner system including a manifold defining a melt channel and being received and supported between a backing plate and a manifold plate, a manifold locating insulator located between the manifold plate and the manifold, a back up insulator located between manifold and the backing plate to position the nozzle body longitudinally, a connector used to connect the back up insulator with the manifold; the side gate nozzle assembly including a nozzle aligner for orienting the nozzle body relative to a cavity member, a locating insulator received in a pocket defined by the manifold plate, and receiving the nozzle body and maintaining its position relative to the manifold plate, and a spring member placed between the locating insulator and the nozzle aligner or the locating insulator and an outer extended flanged portion of the nozzle body; the nozzle body having a melt channel communicating with the melt channel of the manifold; the nozzle body having a head interfacing with the manifold at a manifold-nozzle interface; the nozzle body having a distal end interfacing with the at least one side gate nozzle tip assembly in an engagement state at a nozzle-tip interface; the at least one side gate nozzle tip assembly having a melt channel in fluid communication with the melt channel of the nozzle body, and being retained by the cavity member, the nozzle body and the at least one side gate nozzle tip assembly being slidably engaged to each other, and the at least one nozzle side gate tip assembly including at least one compliant member for operably sealing the at least one side gate nozzle tip assembly to the nozzle body; wherein, when the at least one side gate nozzle tip assembly becomes disengaged from the nozzle body, the at least one side gate nozzle tip assembly remains retained to the cavity member and the nozzle body remains retained to the manifold of the hot runner system. the hot runner system including a manifold defining a melt channel and being received and supported between a backing plate and a manifold plate, a manifold locating insulator located between the manifold plate and the manifold, a back up insulator located between manifold and the backing plate to position the nozzle body longitudinally, a connector used to connect the back up insulator with the manifold; the side gate nozzle assembly including a nozzle aligner for orienting the nozzle body relative to a cavity member, a locating insulator received in a pocket defined by the manifold plate, and receiving the nozzle body and maintaining its position relative to the manifold plate, and a spring member placed between the locating insulator and the nozzle aligner or the locating insulator and an outer extended flanged portion of the nozzle body; the nozzle body having a melt channel communicating with the melt channel of the manifold; the nozzle body having a head interfacing with the manifold at a manifold-nozzle interface; the nozzle body having a distal end interfacing with the at least one side gate nozzle tip assembly in an engagement state at a nozzle-tip interface; the at least one side gate nozzle tip assembly having a melt channel in fluid communication with the melt channel of the nozzle body, and being retained by the cavity member, the nozzle body and the at least one side gate nozzle tip assembly being slidably engaged to each other, and the at least one nozzle side gate tip assembly including at least one compliant member for operably sealing the at least one side gate nozzle tip assembly to the nozzle body; wherein, when the at least one side gate nozzle tip assembly becomes disengaged from the nozzle body, the at least one side gate nozzle tip assembly remains retained to the cavity member and the nozzle body remains retained to the manifold of the hot runner system.