Matl aluminum alloy per ams 4135; hardness per rockwell b70; 0.65 in. Long; 4.0 in. Od plus 3 tabs with 1 hole 0.342 in. Min and 0.354 in. Max diameter ea; bore 3.21 in. Dia; counterbore 3.40 in. Min and 3.41 in. Max diameter by 0.59 in. Min and 0.60 in. Max deep