# 3/4 inch Sch 40 pipe dimensions & weight

> 3/4" Sch 40 pipe (DN 20): OD 26.7 mm, wall 2.87 mm, ID 20.96 mm, weight 1.69 kg/m, water capacity and approximate pressure rating.

Source: https://pipingsupplyjournal.com/3-4-inch-schedule-40-pipe.html  
Publisher: Piping Supply Journal (Piping Supply Journal Editorial Team) · Published 2026-11-03 · Updated 2026-11-04

3/4 inch Sch 40 pipe (DN 20) — dimensions, weight and capacity per ASME B36.10M.

Nominal size| 3/4" (DN 20)  
---|---  
Schedule| Sch 40  
Outside diameter| 26.7 mm (1.051 in)  
Wall thickness| 2.87 mm (0.113 in)  
Inside diameter| 20.96 mm (0.825 in)  
Weight — carbon steel| 1.69 kg/m · 1.14 lb/ft  
Weight — SS 304 / SS 316| 1.71 / 1.72 kg/m  
6 m length (CS)| 10.1 kg  
20 ft length (CS)| 10.3 kg  
Flow area| 3.45 cm²  
Water capacity| 0.345 L/m  
Outer surface (painting)| 0.0839 m²/m  
Approx. max. working pressure*| 281 bar (4,068 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 3/4": [Sch 10S](https://pipingsupplyjournal.com/3-4-inch-schedule-10s-pipe.html) · [Sch 80](https://pipingsupplyjournal.com/3-4-inch-schedule-80-pipe.html) · [Sch 160](https://pipingsupplyjournal.com/3-4-inch-schedule-160-pipe.html) · [XXS](https://pipingsupplyjournal.com/3-4-inch-xxs-pipe.html) · [all 3/4" schedules](https://pipingsupplyjournal.com/3-4-inch-pipe-dimensions.html)

## Frequently asked questions

What is the ID of 3/4 inch Sch 40 pipe?

20.96 mm (0.825 in), with OD 26.7 mm and wall 2.87 mm.

What is the weight of 3/4 inch Sch 40 pipe?

1.69 kg/m (1.14 lb/ft) in carbon steel; 10.1 kg per 6 m length.

What pressure can 3/4 inch Sch 40 pipe take?

Roughly 281 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