Miq
Cruisin' on my Bluebird
@49autocycledeluxe The Unified Thread Standard did not get adopted until after 1949. It is more complicated than just specifying threads per inch. Actually I bet @FSH is intimate with this and could answer more accurately how New Departure's thread spec is not standard if he cared to divulge it .
"Problems with lack of interchangeability among American, Canadian, and British parts during World War II led to an effort to unify the inch-based standards among these closely allied nations, and the Unified Thread Standard was adopted by the Screw Thread Standardization Committees of Canada, the United Kingdom, and the United States on November 18, 1949 in Washington, D.C., with the hope that they would be adopted universally."
History of Standardization
"Problems with lack of interchangeability among American, Canadian, and British parts during World War II led to an effort to unify the inch-based standards among these closely allied nations, and the Unified Thread Standard was adopted by the Screw Thread Standardization Committees of Canada, the United Kingdom, and the United States on November 18, 1949 in Washington, D.C., with the hope that they would be adopted universally."
History of Standardization