# 1/2 inch Sch 40 pipe dimensions & weight

> 1/2" Sch 40 pipe (DN 15): OD 21.3 mm, wall 2.77 mm, ID 15.76 mm, weight 1.27 kg/m, water capacity and approximate pressure rating.

Source: https://pipingsupplyjournal.com/1-2-inch-schedule-40-pipe.html  
Publisher: Piping Supply Journal (Piping Supply Journal Editorial Team) · Published 2026-11-03 · Updated 2026-11-04

1/2 inch Sch 40 pipe (DN 15) — dimensions, weight and capacity per ASME B36.10M.

Nominal size| 1/2" (DN 15)  
---|---  
Schedule| Sch 40  
Outside diameter| 21.3 mm (0.839 in)  
Wall thickness| 2.77 mm (0.109 in)  
Inside diameter| 15.76 mm (0.620 in)  
Weight — carbon steel| 1.27 kg/m · 0.85 lb/ft  
Weight — SS 304 / SS 316| 1.28 / 1.29 kg/m  
6 m length (CS)| 7.6 kg  
20 ft length (CS)| 7.7 kg  
Flow area| 1.95 cm²  
Water capacity| 0.195 L/m  
Outer surface (painting)| 0.0669 m²/m  
Approx. max. working pressure*| 345 bar (5,008 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 1/2": [Sch 10S](https://pipingsupplyjournal.com/1-2-inch-schedule-10s-pipe.html) · [Sch 80](https://pipingsupplyjournal.com/1-2-inch-schedule-80-pipe.html) · [Sch 160](https://pipingsupplyjournal.com/1-2-inch-schedule-160-pipe.html) · [XXS](https://pipingsupplyjournal.com/1-2-inch-xxs-pipe.html) · [all 1/2" schedules](https://pipingsupplyjournal.com/1-2-inch-pipe-dimensions.html)

## Frequently asked questions

What is the ID of 1/2 inch Sch 40 pipe?

15.76 mm (0.620 in), with OD 21.3 mm and wall 2.77 mm.

What is the weight of 1/2 inch Sch 40 pipe?

1.27 kg/m (0.85 lb/ft) in carbon steel; 7.6 kg per 6 m length.

What pressure can 1/2 inch Sch 40 pipe take?

Roughly 345 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.

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Data is for reference; verify against the current edition of the governing standard. Quotations: https://pipingsupplyjournal.com/get-quote.html