What is the outside diameter of 1-1/4 inch pipe?

42.2 mm (1.660 in), in any schedule: it is the DN 32 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.

What is the wall thickness of 1-1/4 inch schedule 40 pipe?

3.56 mm (0.140 in), with an inside diameter of 35.08 mm (1.380 in); carbon steel pipe weighs 3.39 kg/m (2.27 lb/ft).

What is the difference between schedule 40 and 80 in 1-1/4 inch pipe?

The wall: 3.56 mm (0.140 in) in schedule 40 and 4.85 mm (0.191 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 32.50 mm (1.278 in) against 35.08 mm (1.380 in) -- and weighs 4.47 kg/m (3.00 lb/ft) against 3.39 kg/m (2.27 lb/ft).

1-1/4 inch pipe (DN 32): outside diameter, wall thickness and weight by schedule

A 1-1/4 inch pipe (DN 32) has a 42.2 mm (1.660 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)	38.90 mm (1.530 in)	1.65 kg/m (1.11 lb/ft)
Sch 10 / 10S	2.77 mm (0.109 in)	36.66 mm (1.442 in)	2.69 kg/m (1.81 lb/ft)
Sch 30	2.97 mm (0.117 in)	36.26 mm (1.426 in)	2.87 kg/m (1.93 lb/ft)
Sch 40 / STD / 40S	3.56 mm (0.140 in)	35.08 mm (1.380 in)	3.39 kg/m (2.27 lb/ft)
Sch 80 / XS / 80S	4.85 mm (0.191 in)	32.50 mm (1.278 in)	4.47 kg/m (3.00 lb/ft)
Sch 160	6.35 mm (0.250 in)	29.50 mm (1.160 in)	5.61 kg/m (3.77 lb/ft)
XXS	9.70 mm (0.382 in)	22.80 mm (0.896 in)	7.77 kg/m (5.22 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 1-1/4 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 1-1/4 inch pipe?: 42.2 mm (1.660 in), in any schedule: it is the DN 32 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
What is the wall thickness of 1-1/4 inch schedule 40 pipe?: 3.56 mm (0.140 in), with an inside diameter of 35.08 mm (1.380 in); carbon steel pipe weighs 3.39 kg/m (2.27 lb/ft).
What is the difference between schedule 40 and 80 in 1-1/4 inch pipe?: The wall: 3.56 mm (0.140 in) in schedule 40 and 4.85 mm (0.191 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 32.50 mm (1.278 in) against 35.08 mm (1.380 in) -- and weighs 4.47 kg/m (3.00 lb/ft) against 3.39 kg/m (2.27 lb/ft).

1-1/4 inch pipe (DN 32): outside diameter, wall thickness and weight by schedule

Lay out on 1-1/4 inch pipe

Questions

Printable template

Flanges for 1-1/4 inch pipe

By schedule

Other sizes