5 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 5 inch pipe, NPS 5 or DN 125, has an outside diameter of 141.3 mm (5.563 inches) in every schedule. The nominal size is a name, not a measurement: the outside diameter is larger than 5 inch. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 5 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 141.3 mm (5.563 in), the same for every schedule.
- Schedule 40: 6.55 mm wall, 128.2 mm inside diameter.
- Schedule 80: 9.53 mm wall, 122.2 mm inside diameter.
- Metric equivalent: DN 125.
5 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 5S | 2.77 (0.109) | 135.76 (5.345) | 9.46 (6.36) |
| Schedule 10S | 3.40 (0.134) | 134.50 (5.295) | 11.56 (7.77) |
| STD (standard) | 6.55 (0.258) | 128.20 (5.047) | 21.77 (14.63) |
| Schedule 40 | 6.55 (0.258) | 128.20 (5.047) | 21.77 (14.63) |
| XS (extra strong) | 9.53 (0.375) | 122.24 (4.813) | 30.97 (20.81) |
| Schedule 80 | 9.53 (0.375) | 122.24 (4.813) | 30.97 (20.81) |
| Schedule 120 | 12.70 (0.500) | 115.90 (4.563) | 40.28 (27.07) |
| Schedule 160 | 15.88 (0.625) | 109.54 (4.313) | 49.12 (33.01) |
| XXS (double extra strong) | 19.05 (0.750) | 103.20 (4.063) | 57.43 (38.59) |
Nominal dimensions. Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier. Mill tolerances apply, and your project pipe specification takes precedence.
5 inch pipe outside diameter
The outside diameter of NPS 5 pipe is 141.3 mm, or 5.563 inches, whatever the schedule, so 5 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 125.
It is larger than 5 inch because, below NPS 14, the nominal size is a traditional name that once roughly matched the bore, not the outside.
Nearby sizes
- 4 inch pipe dimensions: OD 114.3 mm
- 6 inch pipe dimensions: OD 168.3 mm
Every size and schedule in one table: the pipe schedule chart.
The Deskely products for this
Frequently asked questions
What is the OD of 5 inch pipe?
141.3 mm (5.563 inches), the same for every schedule.
What is the wall thickness of 5 inch schedule 40 pipe?
6.55 mm (0.258 in), giving an inside diameter of 128.2 mm (5.047 in).
What is the wall thickness of 5 inch schedule 80 pipe?
9.53 mm (0.375 in), giving an inside diameter of 122.2 mm (4.813 in).
What is 5 inch pipe in DN?
DN 125.
How much does 5 inch schedule 40 pipe weigh?
21.77 kg/m (14.63 lb/ft) for plain-end carbon steel.
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