SCREW-THREAD STANDARDS FOR FEDERAL SERVICES 1957

(e) Gage dimensions_ 27 . Section XIV. National Buttress threads_ 27 . 1. Historical_ 27 . 2. General_ 28 . 3. Specifications_ 28 . 4. Thread designations_ 32 . 5. Gaging- 33 . 6. British standard Buttress . thread_ 34 . Section threads_ XV. American Standard rolled threads for screw shells of electric lamp holders and for screw shells of ... ................
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