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Diameter Pitch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress Area Max Min Max Min Max Min in² No 1 64 2A No 2 56 2A No 3 48 2A 009 005EN Pipe threads where pressure tight joints are made on the threads Dimensions Pipe threads where pressure tight joints are made on the threads Part 1 Taper external threads and parallel internal threadsWire Diameters Diameter of the wires used to measure the dimension close to the pitch diameter the external screw thread Tolerances Allowance Fundamental deviation of the basic size, applies only to 1A and 2A external classes Major/Pitch/Minor diameters The difference between the maximum and minimum diameters Ekstromcarlson Com Wp Content Uploads 16 09 Technical Threading Chart 15 Pdf 3/8-24 unf-2a pitch diameter