# Schedule 40 pipe and PVC fittings, 1/2 to 2 inch

> What is the actual outside diameter of 1/2, 3/4 and 1 inch Schedule 40 pipe?

- Category: Hardware › Pipe & fittings
- Kind: Hardware
- Basis: ASME B36.10 / ASTM D1785; nominal pipe size (NPS)
- Page: https://xemstudio.com/objects/schedule-40-pipe/ · JSON: https://xemstudio.com/api/geometry?object=schedule-40-pipe · Plain text: https://xemstudio.com/objects/schedule-40-pipe/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Nominal size is not the OD. Fittings grip the OD listed below; a printed adapter that slips over the pipe uses OD + 0.3 mm; one that goes inside a fitting socket uses the same OD − 0.2 mm.
- Wall thickness is Schedule 40 PVC; steel Sch 40 shares the OD.

## Sizes

| nps | od_mm | od_in | wall_mm | id_mm |
|---|---|---|---|---|
| 1/2 | 21.34 | 0.84 | 2.77 | 15.8 |
| 3/4 | 26.67 | 1.05 | 2.87 | 20.9 |
| 1 | 33.4 | 1.315 | 3.38 | 26.6 |
| 1-1/4 | 42.16 | 1.66 | 3.56 | 35.1 |
| 1-1/2 | 48.26 | 1.9 | 3.68 | 40.9 |
| 2 | 60.33 | 2.375 | 3.91 | 52.5 |

## Where the files are

- McMaster-Carr: [Pipe fittings and pipe (free STEP/IGES/STL per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/pipe-fittings/) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Wikipedia: [Nominal Pipe Size](https://en.wikipedia.org/wiki/Nominal_Pipe_Size) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/schedule-40-pipe/index.json

- pipe-sch40-1-2in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-2in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-2in-50mm.stl) — NPS 1/2 Sch 40, 50 mm stub
- pipe-sch40-3-4in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-3-4in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-3-4in-50mm.stl) — NPS 3/4 Sch 40, 50 mm stub
- pipe-sch40-1in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1in-50mm.stl) — NPS 1 Sch 40, 50 mm stub
- pipe-sch40-1-1-4in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-1-4in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-1-4in-50mm.stl) — NPS 1-1-4 Sch 40, 50 mm stub
- pipe-sch40-1-1-2in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-1-2in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-1-1-2in-50mm.stl) — NPS 1-1-2 Sch 40, 50 mm stub
- pipe-sch40-2in-50mm: [STEP](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-2in-50mm.step) · [STL](https://xemstudio.com/files/hardware/schedule-40-pipe/pipe-sch40-2in-50mm.stl) — NPS 2 Sch 40, 50 mm stub

## Questions

**What is the outside diameter of 1/2 inch PVC pipe?**

21.34 mm (0.840 in). Nominal size is not the OD. 3/4 in is 26.67 mm, 1 in is 33.4 mm, 1-1/2 in is 48.26 mm, 2 in is 60.33 mm.

**What size should a 3D printed adapter be to fit over 3/4 inch PVC?**

Bore 26.97 mm (OD + 0.3 mm) for a slip fit; a part that goes inside a fitting socket is the pipe OD minus 0.2 mm.

**What is the inside diameter of Schedule 40 PVC?**

1/2 in 15.8 mm, 3/4 in 20.9 mm, 1 in 26.6 mm, 1-1/4 in 35.1 mm, 1-1/2 in 40.9 mm, 2 in 52.5 mm (wall 2.77–3.91 mm).

## Fits with

- [Tri-clamp (Tri-Clover) sanitary ferrule, 1/2 to 4 inch](https://xemstudio.com/objects/tri-clamp-ferrule/)
- [O-rings, common metric sizes (ISO 3601)](https://xemstudio.com/objects/o-rings-metric/)
- [Imperial machine screws: #4-40, #6-32, #8-32, 1/4-20](https://xemstudio.com/objects/imperial-machine-screws/)