Checking 067880 against the Stainless Bits list http://stainlessbits.com/link12a.html it comes up as: "??? 1/2" x 20" however NM24303 is listed as "CEI 1/2" x20" and in fact that number goes right back to the early Atlas, so it is probably 1/2 x 20 CEI Cycle thread although there's very little difference between Cycle and UNF as both are 60° angle threads.
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