1-1/4 inch Sch 80 pipe dimensions & weight
1-1/4 inch Sch 80 pipe (DN 32) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 1-1/4" (DN 32) |
| Schedule | Sch 80 |
| Outside diameter | 42.2 mm (1.661 in) |
| Wall thickness | 4.85 mm (0.191 in) |
| Inside diameter | 32.50 mm (1.280 in) |
| Weight — carbon steel | 4.47 kg/m · 3.00 lb/ft |
| Weight — SS 304 / SS 316 | 4.52 / 4.54 kg/m |
| 6 m length (CS) | 26.8 kg |
| 20 ft length (CS) | 27.2 kg |
| Flow area | 8.30 cm² |
| Water capacity | 0.830 L/m |
| Outer surface (painting) | 0.1326 m²/m |
| Approx. max. working pressure* | 302 bar (4,375 psi) — A106 Gr B |
*Approximate ASME B31.3 straight-pipe rating at ≤ 38 °C for seamless A106 Gr B (S = 137.9 MPa, E = 1, 12.5% mill tolerance, no corrosion allowance). Use the wall thickness calculator for your own design conditions.
Other schedules for 1-1/4": Sch 10S · Sch 40 · Sch 160 · XXS · all 1-1/4" schedules
Frequently asked questions
What is the ID of 1-1/4 inch Sch 80 pipe?
32.50 mm (1.280 in), with OD 42.2 mm and wall 4.85 mm.
What is the weight of 1-1/4 inch Sch 80 pipe?
4.47 kg/m (3.00 lb/ft) in carbon steel; 26.8 kg per 6 m length.
What pressure can 1-1/4 inch Sch 80 pipe take?
Roughly 302 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.
Last updated 2026-11-02