I have a gov't project and need to locat some of both. We will machine to size for later use, then heat treat to 249 KSI to strengthen. then receive items back and install.
AMS61315 Steel 1.8Ni .25Mo (0.38 - 0.43C) Heat Treated (105,000 Tensile Strength) (Cancelled Aug 1946) has been cancelled, but can be purchased from SAE: