ACS-MRS-1204 is a Northrop Grumman specification for 6Al-4V calling for “TITANIUM ALLOY FORGING”
Northrop Grumman is an Aerospace and Defense company famous for the B-2 Spirit Bomber, and more recently its unmanned aircraft RQ-4.
Like other Major Tier 1 Aerospace companies, Northrop Grumman has special quality approvals for the procurement of Titanium. ACS-MRS-1204 is a quality specification for 6Al-4V for TITANIUM ALLOY FORGING. Some engineers will omit ACS when calling out MRS-1204 or MRS1204 altogether.