steel alloy 1020 per astm a108; phosphate coat per dod-p-16232; 7.946 in. min to 7.948 in. max od; 7.203 in. min to 7.205 in. max id; 2.250 in. l; od slotted in middle 0.250 in. w,0.250 in. deep; two threads per inch on od general characteristics item description