What is the outside diameter of 1 inch pipe?

33.4 mm (1.315 in), in any schedule: it is the DN 25 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.

What is the wall thickness of 1 inch schedule 40 pipe?

3.38 mm (0.133 in), with an inside diameter of 26.64 mm (1.049 in); carbon steel pipe weighs 2.50 kg/m (1.68 lb/ft).

What is the difference between schedule 40 and 80 in 1 inch pipe?

The wall: 3.38 mm (0.133 in) in schedule 40 and 4.55 mm (0.179 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 24.30 mm (0.957 in) against 26.64 mm (1.049 in) -- and weighs 3.24 kg/m (2.17 lb/ft) against 2.50 kg/m (1.68 lb/ft).

1 inch pipe (DN 25): outside diameter, wall thickness and weight by schedule

A 1 inch pipe (DN 25) has a 33.4 mm (1.315 in) outside diameter in every schedule: what changes is the wall, and with it the inside diameter and the weight. Designations that give the same wall share a row.

Schedule	Wall	ID	Weight
Sch 5 / 5S	1.65 mm (0.065 in)	30.10 mm (1.185 in)	1.29 kg/m (0.87 lb/ft)
Sch 10 / 10S	2.77 mm (0.109 in)	27.86 mm (1.097 in)	2.09 kg/m (1.41 lb/ft)
Sch 30	2.90 mm (0.114 in)	27.60 mm (1.087 in)	2.18 kg/m (1.46 lb/ft)
Sch 40 / STD / 40S	3.38 mm (0.133 in)	26.64 mm (1.049 in)	2.50 kg/m (1.68 lb/ft)
Sch 80 / XS / 80S	4.55 mm (0.179 in)	24.30 mm (0.957 in)	3.24 kg/m (2.17 lb/ft)
Sch 160	6.35 mm (0.250 in)	20.70 mm (0.815 in)	4.24 kg/m (2.85 lb/ft)
XXS	9.09 mm (0.358 in)	15.22 mm (0.599 in)	5.45 kg/m (3.66 lb/ft)

Plain-end weight of carbon steel pipe, by the standard's own formula: 10.69 × (D − t) × t in lb/ft, with D and t in inches (0.0246615 × (D − t) × t in kg/m, in mm). Austenitic stainless weighs about 2% more.

Lay out on 1 inch pipe

The outside diameter and the wall of the chosen schedule go to the calculator, which opens with them filled in and draws without an account.

Schedule Pipe saddle (90° tee) 90° lobster back bend

Questions

What is the outside diameter of 1 inch pipe?: 33.4 mm (1.315 in), in any schedule: it is the DN 25 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
What is the wall thickness of 1 inch schedule 40 pipe?: 3.38 mm (0.133 in), with an inside diameter of 26.64 mm (1.049 in); carbon steel pipe weighs 2.50 kg/m (1.68 lb/ft).
What is the difference between schedule 40 and 80 in 1 inch pipe?: The wall: 3.38 mm (0.133 in) in schedule 40 and 4.55 mm (0.179 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 24.30 mm (0.957 in) against 26.64 mm (1.049 in) -- and weighs 3.24 kg/m (2.17 lb/ft) against 2.50 kg/m (1.68 lb/ft).

1 inch pipe (DN 25): outside diameter, wall thickness and weight by schedule

Lay out on 1 inch pipe

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