# 1/16 — Plumbing fitting and pipe thread standards

For 1/16, thread standard is BSP; threads per inch (tpi) is 28; thread pitch (mm) is 0.907; major (outside) diameter (mm) is 7.723; minor diameter (mm) is 6.561, recorded from its source on 2026-08-12.

- **Thread standard:** BSP _(our reading, not quoted from the source)_
- **Nominal size:** 1/16 _(verified: appears in the quote below)_
- **Threads per inch (TPI):** 28 _(verified: appears in the quote below)_
- **Thread pitch (mm):** 0.907 _(verified: appears in the quote below)_
- **Major (outside) diameter (mm):** 7.723 _(verified: appears in the quote below)_
- **Minor diameter (mm):** 6.561 _(verified: appears in the quote below)_
- **Thread angle (degrees):** 55 _(our reading, not quoted from the source)_
- **Governing standard:** ISO 228-1 _(our reading, not quoted from the source)_

## What the source says

> 1/16 | 28 | 0.907 | 0.581 | 7.723 | 7.142 | 6.561 |

## Source

- https://amesweb.info/Screws/BSP-Thread-Chart.aspx

Last verified: 2026-08-12. Review by: 2028-08-11.
Part of [Plumbing fitting and pipe thread standards](https://referencesource.org/plumbing-fitting-thread-standards/).