Qq-s-766 fed spec single material response or mil-s-5059 mil spec single material response
Mil-s-5059,ty 302,1/2 hard mil spec 1st material response overall or mil-s-18729 mil spec 2nd material response overall
Mil-s-5059 mil spec 1st material response or mil-s-5059 mil spec 2nd material response or aisi assn std 3rd material response