"MATERIAL IS CARBON STEEL PER AMS 6370 TYPE 4130 OR AMS 6382 TYPE 4140, HARDENED PER SAE AS4841, FINNISH IS CADMIUM PLATE PER QQ-P-416 TYPE II CLASS 2 DYE BLACK AND COAT WITH LIGHT FILM OF OIL PER SAE AS4841, DESIGNED FOR USE IN SYSTEMS WITH MAX OPERATING PRESSURE OF 3000 PSI."