Aluminum alloy, qq-a-200/3, composition 2024, temper t3511, 2.249 in. Min, 2.250 in. Max od, 2.000 in. Min, 2.005 in. Max id, 0.510 in. Min, 0.515 in. Max o/a w, hard anodize per mil-a-8625, type 3, cl 1, 33 internal spline teeth, penetrant inspect permil-i-6866, , type 1, method-a