Schedule 5S Pipe Dimensions
ASME B36.19M stainless steel pipe in 5S, NPS 1/2 through NPS 30 — with the B36.10M Schedule 5 wall alongside, because the two are routinely swapped by mistake.
- Schedule
- 5S
- Standard
- ASME B36.19M
- Material
- Stainless steel
- Sizes published
- 21 (NPS 1/2 to NPS 30)
- Thinnest wall
- 0.065 in (1.7 mm) at NPS 1/2
- Thickest wall
- 0.250 in (6.3 mm) at NPS 30
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Size | DN | Outside diameter | 5S wall | Inside diameter | Weight, empty | vs Schedule 5 |
|---|---|---|---|---|---|---|
| NPS 1/2 | DN 15 | 0.84021.34 mm | 0.0651.65 mm | 0.71018.03 mm | 0.550.81 kg/m | same as Sch 5 |
| NPS 3/4 | DN 20 | 1.05026.67 mm | 0.0651.65 mm | 0.92023.37 mm | 0.691.03 kg/m | same as Sch 5 |
| NPS 1 | DN 25 | 1.31533.40 mm | 0.0651.65 mm | 1.18530.10 mm | 0.881.31 kg/m | same as Sch 5 |
| NPS 1 1/4 | DN 32 | 1.66042.16 mm | 0.0651.65 mm | 1.53038.86 mm | 1.121.67 kg/m | same as Sch 5 |
| NPS 1 1/2 | DN 40 | 1.90048.26 mm | 0.0651.65 mm | 1.77044.96 mm | 1.291.92 kg/m | same as Sch 5 |
| NPS 2 | DN 50 | 2.37560.32 mm | 0.0651.65 mm | 2.24557.02 mm | 1.632.42 kg/m | same as Sch 5 |
| NPS 2 1/2 | DN 65 | 2.87573.02 mm | 0.0832.11 mm | 2.70968.81 mm | 2.513.74 kg/m | same as Sch 5 |
| NPS 3 | DN 80 | 3.50088.90 mm | 0.0832.11 mm | 3.33484.68 mm | 3.074.58 kg/m | same as Sch 5 |
| NPS 3 1/2 | DN 90 | 4.000101.60 mm | 0.0832.11 mm | 3.83497.38 mm | 3.525.24 kg/m | same as Sch 5 |
| NPS 4 | DN 100 | 4.500114.30 mm | 0.0832.11 mm | 4.334110.08 mm | 3.975.91 kg/m | same as Sch 5 |
| NPS 5 | DN 125 | 5.563141.30 mm | 0.1092.77 mm | 5.345135.76 mm | 6.449.59 kg/m | same as Sch 5 |
| NPS 6 | DN 150 | 6.625168.27 mm | 0.1092.77 mm | 6.407162.74 mm | 7.7011.46 kg/m | same as Sch 5 |
| NPS 8 | DN 200 | 8.625219.07 mm | 0.1092.77 mm | 8.407213.54 mm | 10.0614.97 kg/m | same as Sch 5 |
| NPS 10 | DN 250 | 10.750273.05 mm | 0.1343.40 mm | 10.482266.24 mm | 15.4222.95 kg/m | same as Sch 5 |
| NPS 12 | DN 300 | 12.750323.85 mm | 0.1563.96 mm | 12.438315.93 mm | 21.3031.69 kg/m | same as Sch 5 |
| NPS 14 | DN 350 | 14.000355.60 mm | 0.1563.96 mm | 13.688347.68 mm | 23.4134.84 kg/m | same as Sch 5 |
| NPS 16 | DN 400 | 16.000406.40 mm | 0.1654.19 mm | 15.670398.02 mm | 28.3242.15 kg/m | same as Sch 5 |
| NPS 18 | DN 450 | 18.000457.20 mm | 0.1654.19 mm | 17.670448.82 mm | 31.9047.47 kg/m | same as Sch 5 |
| NPS 20 | DN 500 | 20.000508.00 mm | 0.1884.78 mm | 19.624498.45 mm | 40.3860.09 kg/m | same as Sch 5 |
| NPS 24 | DN 600 | 24.000609.60 mm | 0.2185.54 mm | 23.564598.53 mm | 56.2083.64 kg/m | same as Sch 5 |
| NPS 30 | DN 750 | 30.000762.00 mm | 0.2506.35 mm | 29.500749.30 mm | 80.63119.98 kg/m | same as Sch 5 |
Weight is plain-end austenitic stainless, taken as 1.5% heavier than the carbon steel formula w = 10.6802 × t × (OD − t) lb/ft.
Across every size B36.19M publishes in 5S, the wall thickness is identical to B36.10M Schedule 5. The difference between them is the material, the permitted tolerances and the size range — not the wall.
Common questions
Is 5S the same as Schedule 5?
In wall thickness, yes. Every size B36.19M publishes in 5S carries the same wall as Schedule 5. The S suffix always signals stainless pipe to ASME B36.19M, which also stops at NPS 30 in this schedule where B36.10M continues.
What sizes does 5S come in?
NPS 1/2 through NPS 30 — 21 sizes. B36.19M is a shorter standard than B36.10M: it publishes 40S and 80S only through NPS 12, and 5S and 10S only through NPS 30. Beyond that, stainless pipe is ordered to a B36.10M schedule.
Why is 5S pipe used?
Stainless costs several times what carbon steel does, so stainless lines are run as thin as the pressure allows. The S-schedules exist to give that thin end of the range a designation — 10S in particular is the workhorse wall for low-pressure stainless process and sanitary piping.