12 inch XXS pipe dimensions & weight
12 inch XXS pipe (DN 300) — dimensions, weight and capacity per ASME B36.19M.
| Nominal size | 12" (DN 300) |
| Schedule | XXS |
| Outside diameter | 323.9 mm (12.752 in) |
| Wall thickness | 25.40 mm (1.000 in) |
| Inside diameter | 273.10 mm (10.752 in) |
| Weight — carbon steel | 186.97 kg/m · 125.64 lb/ft |
| Weight — SS 304 / SS 316 | 188.88 / 190.07 kg/m |
| 6 m length (CS) | 1121.8 kg |
| 20 ft length (CS) | 1139.8 kg |
| Flow area | 585.78 cm² |
| Water capacity | 58.578 L/m |
| Outer surface (painting) | 1.0176 m²/m |
| Approx. max. working pressure* | 167 bar (2,422 psi) — A312 TP316L |
*Approximate ASME B31.3 straight-pipe rating at ≤ 38 °C for seamless A312 TP316L (S = 115.0 MPa, E = 1, 12.5% mill tolerance, no corrosion allowance). Use the wall thickness calculator for your own design conditions.
Other schedules for 12": Sch 10S · Sch 40 · Sch 80 · Sch 160 · all 12" schedules
Frequently asked questions
What is the ID of 12 inch XXS pipe?
273.10 mm (10.752 in), with OD 323.9 mm and wall 25.40 mm.
What is the weight of 12 inch XXS pipe?
186.97 kg/m (125.64 lb/ft) in carbon steel; 1121.8 kg per 6 m length.
What pressure can 12 inch XXS pipe take?
Roughly 167 bar at ambient for seamless A312 TP316L under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.
Last updated 2026-11-02