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Aeromotive Fuel Systems - AN vs NPT vs ORB – what's the difference? AN (army/navy) fittings have straight threads and seal using a SAE 37-degree flare. NPT (national pipe thread) means it
AN & NPT Thread Sizes Chart | Rorty
Thread And Tube End Size Chart - ACS
Tech Tip: Thread Size Chart for AN Fittings
What are AN Fittings and Adapters?
10AN AN10 Male to 7/8"-14 UNF (10AN Thread) O-Ring Boss Alloy Fittings Adapter | eBay