ordepths. However, there is a subtle difference in the root and crest diameters of the threads. NPT / NPTF Thread size Major Diameter (mm) TPI 1/16” – 27 NPT 7,938 27 1/8” – 27 NPT 10,287 27 1/4” – 18 NPT 13,716 18 3/8” – 18 NPT 17,145 18 1/2” – 14 NPT 21,336 14 3/4” – 14 NPT 26,670 14 1” – 11 ½ NPT 33,401 11,5
Althoughsome BSP and NPT threads might tighten and engage reasonably well, pitch and thread angle differences between them can cause spiral leakage. At 1/16, 1/8, ¼, and 3/8 sizes, pitch difference results in misalignment of the threads. This misalignment might result in the threads partially fastening. However, at 1/2 and 3/4
18-27 NPT - Internal (Fitting) Basic Thread Dimensions. For interpertations of the terms scroll down to the drawings below the table. Property. Inch. mm. Nominal Pipe Size (Ø) 1/8".
NPTMale Threaded Pipe Inlet × Schrader Male Threaded Hose Outlet. Outlet. Inlet Pipe Size. Thread Size. Connection Lg. Some couplers meet SAE AS4395, an automotive industry standard for flared fitting dimensions. 70 mm: Thread Size. Connection Length: Maximum Pressure, psi: Temperature Range, °F: Overall Length, mm: Hex Size, mm:
NationalPipe Threads (NPT) profile, dimension and tolerance. NPT 1/8, NPT 1/4, NPT 3/8, NPT 1/2, NPT 3/4, NPT 1, NPT 1 1/4, NPT 1 1/2, NPT 2, NPT 2 1/2, NPT 3, NPT 3 1/2,
ThreadChart – BSPT & NPT 3 NPT 8 TPI 82.55 mm 3 BSPT 11 TPI 82.50 mm 3 1/2 NPT 8 TPI 95.25 mm 4 BSPT 11 TPI 108.00 mm 4 NPT 8 TPI 107.95 mm 5 BSPT 11 TPI 134.00 mm 4 1/2 NPT 8 TPI 120.65 mm 6 BSPT 11 TPI 161.00 mm 5 NPT 8 TPI 134.15 mm 6 NPT 8 TPI 161.15 mm
qErX. 113 814 344 828 376 29 456 121
3 8 npt thread dimensions in mm
