MIL-P-13924 Spec. Parts

Mil-p-13924, class 4 mil spec single treatment response overall

Black overall

Mil-p-13924 class 4 mil spec single treatment response overall

Black bearing surface of head

Qq-p-416 ty 2 cl 2 fed spec 1st treatment response overall or aa-p-416 t7 2 cl 2 mil spec 2nd treatment response overall or mil-p-13924 cl 1 mil spec 3rd treatment response overall