To Stabilize AS893D - issued 1-15-76 per MIL-F-18280 for O2 and GSE only; revised 4 times (12-1-83 to add O2 cleaning requirement and part id note, 1995-12 to reformat to SAE template and revised title, 2008-03 to add cad note, change proc spec to AS4842/2 and associated QML requirements, update matl inactive/can'd specs to active ones, revised wrench flat tolerances, and inactivated 'D' matl for new design, 2009-11 to update to current SAE template along with Table updates and add 'D' inactive effectivity date; reaffirmed twice; April 1983 & 2007-08. No other significant changes to the standard.