6 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 6 inch pipe, NPS 6 or DN 150, has an outside diameter of 168.3 mm (6.625 inches) in every schedule. The nominal size is a name, not a measurement: the outside diameter is larger than 6 inch. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 6 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 168.3 mm (6.625 in), the same for every schedule.
- Schedule 40: 7.11 mm wall, 154.1 mm inside diameter.
- Schedule 80: 10.97 mm wall, 146.4 mm inside diameter.
- Metric equivalent: DN 150.
6 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 5S | 2.77 (0.109) | 162.76 (6.408) | 11.31 (7.60) |
| Schedule 10S | 3.40 (0.134) | 161.50 (6.358) | 13.83 (9.29) |
| STD (standard) | 7.11 (0.280) | 154.08 (6.066) | 28.26 (18.99) |
| Schedule 40 | 7.11 (0.280) | 154.08 (6.066) | 28.26 (18.99) |
| XS (extra strong) | 10.97 (0.432) | 146.36 (5.762) | 42.56 (28.60) |
| Schedule 80 | 10.97 (0.432) | 146.36 (5.762) | 42.56 (28.60) |
| Schedule 120 | 14.27 (0.562) | 139.76 (5.502) | 54.21 (36.42) |
| Schedule 160 | 18.26 (0.719) | 131.78 (5.188) | 67.57 (45.40) |
| XXS (double extra strong) | 21.95 (0.864) | 124.40 (4.898) | 79.22 (53.23) |
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.
6 inch pipe outside diameter
The outside diameter of NPS 6 pipe is 168.3 mm, or 6.625 inches, whatever the schedule, so 6 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 150.
It is larger than 6 inch because, below NPS 14, the nominal size is a traditional name that once roughly matched the bore, not the outside.
Nearby sizes
- 5 inch pipe dimensions: OD 141.3 mm
- 8 inch pipe dimensions: OD 219.1 mm
Every size and schedule in one table: the pipe schedule chart.
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Frequently asked questions
What is the OD of 6 inch pipe?
168.3 mm (6.625 inches), the same for every schedule.
What is the wall thickness of 6 inch schedule 40 pipe?
7.11 mm (0.280 in), giving an inside diameter of 154.1 mm (6.066 in).
What is the wall thickness of 6 inch schedule 80 pipe?
10.97 mm (0.432 in), giving an inside diameter of 146.4 mm (5.762 in).
What is 6 inch pipe in DN?
DN 150.
How much does 6 inch schedule 40 pipe weigh?
28.26 kg/m (18.99 lb/ft) for plain-end carbon steel.
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