2 replies to this topic

[Fred.R]

Hi Guys dont know if this should go here or the nostalga forum but what grade aluminium is L72 having googled NS4 seems to be 5251 but cant find a referance to L72 these were materials used in the 60's and 70's for tub's i am assuming these are an older english standard or a manufactures codeing while i am at it what about HS30?

Cheers
Fred

[gordmac]

maybe these guys can help
http://www.alfed.org...site/alfed/home

[Engineguy]

Per NASA:

L72: 2014 T4
L73: 2014 T6
.