ALLOY STEEL 4340 (UNS G-0) PER AMS6415, E4340 (UNS G43406) PER MIL-S-5000 OR
AMs5737 OR AMS5853.
OR 8740 (UNS G87400) PER MlL-S-6049.
TITANIUM ALLOY - 6AL-4V-2Sn (UNS R6620) PER AMS4971.
CRES - A286 (UNS -86) CONFORMING TO THE CHEMISTRY OF AMS5731, AMS5732,