# 1/4 inch Sch 40 pipe dimensions & weight > 1/4" Sch 40 pipe (DN 8): OD 13.7 mm, wall 2.24 mm, ID 9.22 mm, weight 0.63 kg/m, water capacity and approximate pressure rating. Source: https://pipingsupplyjournal.com/1-4-inch-schedule-40-pipe.html Publisher: Piping Supply Journal (Piping Supply Journal Editorial Team) · Published 2026-11-03 · Updated 2026-11-04 1/4 inch Sch 40 pipe (DN 8) — dimensions, weight and capacity per ASME B36.10M. Nominal size| 1/4" (DN 8) ---|--- Schedule| Sch 40 Outside diameter| 13.7 mm (0.539 in) Wall thickness| 2.24 mm (0.088 in) Inside diameter| 9.22 mm (0.363 in) Weight — carbon steel| 0.63 kg/m · 0.42 lb/ft Weight — SS 304 / SS 316| 0.64 / 0.64 kg/m 6 m length (CS)| 3.8 kg 20 ft length (CS)| 3.8 kg Flow area| 0.67 cm² Water capacity| 0.067 L/m Outer surface (painting)| 0.0430 m²/m Approx. max. working pressure*| 446 bar (6,462 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 1/4": [Sch 10S](https://pipingsupplyjournal.com/1-4-inch-schedule-10s-pipe.html) · [Sch 80](https://pipingsupplyjournal.com/1-4-inch-schedule-80-pipe.html) · [all 1/4" schedules](https://pipingsupplyjournal.com/1-4-inch-pipe-dimensions.html) ## Frequently asked questions What is the ID of 1/4 inch Sch 40 pipe? 9.22 mm (0.363 in), with OD 13.7 mm and wall 2.24 mm. What is the weight of 1/4 inch Sch 40 pipe? 0.63 kg/m (0.42 lb/ft) in carbon steel; 3.8 kg per 6 m length. What pressure can 1/4 inch Sch 40 pipe take? Roughly 446 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