in practical applications, the air shaft is convenient to operate, quickly, no damage for ... filling gas for the nozzle jet, to make the shaft of off-axle apperance uniform expansion, thereby lock ... to deflated, then nitrogen-treated barrel can be unloaded.4.Performance and advantages: in practical applications, it is ... Ø126mm6 "Ø150mmØ155 – Ø158mm8 "Ø200mmØ205 – Ø208mm machine parts key type air shaft