Aluminum alloy, mil-a-21180 comp a356 cl 10; anodized, mil-a-8625 cl 1 type 1 and painted finish; 0.500 in. Nom o/a lg; 10.18 in. Nom od external flange; 10 holes 0.220 in. Min, 0.230 in. Max diameter through external flange on 9.620 in. Nom bolt circle dia; 3.380 in. Nom od internal flange, 2.312 in. Min, 2.313 in. Max id internal flange; 3 thd holes through internal flange on 2.750 in. Nom bolt circle dia, 5/16 in.-18 unc series cl 2b thd; thd holes countersunk 0.323 in. Min, 0.333 in. Max diameter by 82 min, 100 max deg
