1-1/4 inch Sch 40 pipe dimensions & weight
1-1/4 inch Sch 40 pipe (DN 32) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 1-1/4" (DN 32) |
| Schedule | Sch 40 |
| Outside diameter | 42.2 mm (1.661 in) |
| Wall thickness | 3.56 mm (0.140 in) |
| Inside diameter | 35.08 mm (1.381 in) |
| Weight — carbon steel | 3.39 kg/m · 2.28 lb/ft |
| Weight — SS 304 / SS 316 | 3.42 / 3.45 kg/m |
| 6 m length (CS) | 20.3 kg |
| 20 ft length (CS) | 20.7 kg |
| Flow area | 9.67 cm² |
| Water capacity | 0.967 L/m |
| Outer surface (painting) | 0.1326 m²/m |
| Approx. max. working pressure* | 216 bar (3,138 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 80 · Sch 160 · XXS · all 1-1/4" schedules
Frequently asked questions
What is the ID of 1-1/4 inch Sch 40 pipe?
35.08 mm (1.381 in), with OD 42.2 mm and wall 3.56 mm.
What is the weight of 1-1/4 inch Sch 40 pipe?
3.39 kg/m (2.28 lb/ft) in carbon steel; 20.3 kg per 6 m length.
What pressure can 1-1/4 inch Sch 40 pipe take?
Roughly 216 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