Thread Identification: 管道尺寸不直接反映物理尺寸，需要测量管的外部直径 (OD) 来确定。例如，一个3/4" NPT的管子OD为1.050英寸。每个螺纹规格都有固定的TPI和OD，例如3/4" NPT的TPI为14。TPI和OD结合使用是确定螺纹尺寸的必要条件，因为有些尺寸可能具有相同的TPI。NPT vs. NPS: NPT与NPS（美...
Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is ...
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As mentioned above, NPT threading has a tapered design that helps form a connection that prevents leaks in fluid/gas systems. NPS threads (or sometimes called parallel) fittings, on the other hand, are straight threads that are typically used for quick connections that do not require a tight ...