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The table below lists outside diameter (OD) and wall thickness in inches for NPS 1/2" through 12", per ASME B36.19M, covering the four most-used stainless schedules.
| NPS | OD (in) | SCH 5S (in) | SCH 10S (in) | SCH 40S (in) | SCH 80S (in) |
| 1/2" | 0.840 | 0.065 | 0.083 | 0.109 | 0.147 |
| 3/4" | 1.050 | 0.065 | 0.083 | 0.113 | 0.154 |
| 1" | 1.315 | 0.065 | 0.109 | 0.113 | 0.179 |
| 1-1/4" | 1.660 | 0.065 | 0.109 | 0.140 | 0.191 |
| 1-1/2" | 1.900 | 0.065 | 0.109 | 0.145 | 0.200 |
| 2" | 2.375 | 0.065 | 0.109 | 0.154 | 0.218 |
| 2-1/2" | 2.875 | 0.083 | 0.120 | 0.203 | 0.276 |
| 3" | 3.500 | 0.083 | 0.120 | 0.216 | 0.300 |
| 4" | 4.500 | 0.083 | 0.120 | 0.237 | 0.337 |
| 5" | 5.563 | 0.109 | 0.134 | 0.258 | 0.375 |
| 6" | 6.625 | 0.109 | 0.134 | 0.280 | 0.432 |
| 8" | 8.625 | 0.109 | 0.148 | 0.322 | 0.500 |
| 10" | 10.750 | 0.134 | 0.165 | 0.365 | 0.500 |
| 12" | 12.750 | 0.156 | 0.180 | 0.375 | 0.500 |
Data per ASME B36.19M. Three ranges diverge from the equivalent carbon-steel values under B36.10M: SCH 10S at NPS 14–22, SCH 40S at NPS 12, and SCH 80S at NPS 10 and 12 (visible in the 0.500" values above) — always confirm which standard applies before ordering. This chart is organized by schedule so you can look up wall thickness directly; for the complete dimension set — inside diameter, unit weight, and every schedule size beyond NPS 12
SCH 5S vs SCH 10S vs SCH 40S vs SCH 80S
Each schedule fits a different balance of weight, cost, and mechanical margin. The table below is a general guide to typical use — actual pressure suitability always needs to be verified against the applicable design code.
| Schedule | Wall Thickness | Typical Characteristics | Common Applications |
| SCH 5S | Thinnest | Lightest weight, lowest material cost, least corrosion/wear allowance | Sanitary piping, low-pressure fluid transfer, instrumentation lines |
| SCH 10S | Light-to-medium | Good balance of weight and strength for welded construction | General process piping, water and beverage lines, HVAC |
| SCH 40S | Standard | Most widely stocked and specified; solid general-purpose margin | Process piping, structural and mechanical piping, general industrial use |
| SCH 80S | Heavy | Extra wall thickness for higher pressure or added corrosion allowance | High-pressure lines, chemical processing, piping with long service-life requirements |
We're deliberately not attaching pressure ratings to these categories here, because actual allowable working pressure depends on the material grade, pipe size, operating temperature, joint efficiency, and the design standard you're working to (ASME B31.3, B31.1, etc.). Two pipes with the same schedule but different grades — say 304 vs. 316L — won't necessarily carry the same pressure rating.
Read a full guide: Stainless Steel Pipe Schedule Chart
Article source: https://article-realm.com/article/Business/84545-Stainless-Steel-Pipe-Schedule-Chart.html
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https://www.permanentsteel.com/Permanent Steel Manufacturing Co.,Ltd (PMC) have years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings.(Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube) Please refer to: https://www.permanentsteel.com
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