Pipe Size Chart in mm and Inches

Quick answer: nominal pipe size is not the same as outside diameter. For example, 1/2 in NPS pipe has a 0.840 in outside diameter, which is about 21.3 mm. DN is a metric designator, not a direct inside-diameter measurement.

NPS To DN Pipe Size Chart

[gs_table id=”9435″]

Pipe Size Terms

  • NPS: nominal pipe size, used for inch pipe names.
  • DN: metric nominal designation paired with NPS sizes.
  • OD: outside diameter, the dimension you can measure across the pipe.
  • Schedule: wall thickness family, such as Schedule 40 or Schedule 80.

Related references: PVC pipe sizes chart, PEX tubing size chart, and EMT conduit sizes chart.

Source Notes

Dimensions were checked against ASME B36.10/B36.19 style pipe dimension references including Octal Steel’s ANSI pipe dimension chart and Ferrobend’s ASME B36.10M dimension chart. Confirm material and schedule before ordering fittings.

Related posts:

Pvc Pipe Sizes ChartPVC Pipe Sizes Chart: Schedule 40, Schedule 80, and Thinwall Dimensions Compressed Air Pipe Size CFM Chart: Pipe Diameter and Pressure Drop Propane Gas Pipe Sizing Chart: Low Pressure LP Capacity Guide Natural Gas Pipe Sizing Chart 5 PSI: Capacity, Pressure Drop, and Safety Notes
See also  Straight-Shank Rose Chucking Reamers: Selected Fractional Dimensions