MIL-T-6845D (NOTICE 3), MILITARY SPECIFICATION: TUBING, STEEL, CORROSION-RESISTANT (S30400), AEROSPACE VEHICLE HYDRAULIC SYSTEM 1/8 HARD CONDITION (25 NOV 1998) [S/S BY SAE-AMS-T-6845]., MIL-T-6845D remains inactive for new design; however, the document is valid for acquisitionwhen needed.