# 3/8 inch Sch 40 pipe dimensions & weight > 3/8" Sch 40 pipe (DN 10): OD 17.1 mm, wall 2.31 mm, ID 12.48 mm, weight 0.84 kg/m, water capacity and approximate pressure rating. Source: https://pipingsupplyjournal.com/3-8-inch-schedule-40-pipe.html Publisher: Piping Supply Journal (Piping Supply Journal Editorial Team) · Published 2026-11-03 · Updated 2026-11-04 3/8 inch Sch 40 pipe (DN 10) — dimensions, weight and capacity per ASME B36.10M. Nominal size| 3/8" (DN 10) ---|--- Schedule| Sch 40 Outside diameter| 17.1 mm (0.673 in) Wall thickness| 2.31 mm (0.091 in) Inside diameter| 12.48 mm (0.491 in) Weight — carbon steel| 0.84 kg/m · 0.56 lb/ft Weight — SS 304 / SS 316| 0.85 / 0.85 kg/m 6 m length (CS)| 5.0 kg 20 ft length (CS)| 5.1 kg Flow area| 1.22 cm² Water capacity| 0.122 L/m Outer surface (painting)| 0.0537 m²/m Approx. max. working pressure*| 360 bar (5,222 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](https://pipingsupplyjournal.com/pipe-wall-thickness-calculator.html) for your own design conditions. Other schedules for 3/8": [Sch 10S](https://pipingsupplyjournal.com/3-8-inch-schedule-10s-pipe.html) · [Sch 80](https://pipingsupplyjournal.com/3-8-inch-schedule-80-pipe.html) · [all 3/8" schedules](https://pipingsupplyjournal.com/3-8-inch-pipe-dimensions.html) ## Frequently asked questions What is the ID of 3/8 inch Sch 40 pipe? 12.48 mm (0.491 in), with OD 17.1 mm and wall 2.31 mm. What is the weight of 3/8 inch Sch 40 pipe? 0.84 kg/m (0.56 lb/ft) in carbon steel; 5.0 kg per 6 m length. What pressure can 3/8 inch Sch 40 pipe take? Roughly 360 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code. --- Data is for reference; verify against the current edition of the governing standard. Quotations: https://pipingsupplyjournal.com/get-quote.html