MIL-T-6845D (NOTICE 2), MILITARY SPECIFICATION: TUBING, STEEL, CORROSION-RESISTANT (S30400), AEROSPACE VEHICLE HYDRAULIC SYSTEM 1/8 HARD CONDITION (12 DEC 1994) [S/S BY SAE-AMS-T-6845]., MIL-T-6845D, is inactive for new design and is no longer used by the Air Force except for replacement purposes.