# NPT — Hydraulic and pipe connection type identification

For NPT, region of origin is American Connections; thread type (tapered or parallel) is tapered; seal method is NPT is a U.S. standard for tapered threads used on pipes and fittings. They are used to effectively seal pipes for fluid and gas transfer, recorded from its source on 2026-08-13.

- **Connection type:** NPT _(verified: appears in the quote below)_
- **Governing standard:** NPT _(verified: appears in the quote below)_
- **Region of origin:** American Connections _(our reading, not quoted from the source)_
- **Thread type (tapered or parallel):** tapered _(verified: appears in the quote below)_
- **Seal method:** NPT is a U.S. standard for tapered threads used on pipes and fittings. They are used to effectively seal pipes for fluid and gas transfer. _(verified: appears in the quote below)_

## What the source says

> NPT (National Pipe Tapered) -style pipe threads have been widely used for over 100 years. NPT is a U.S. standard for tapered threads used on pipes and fittings. They are used to effectively seal pipes for fluid and gas transfer. The nominal pipe size can be identified by physically measuring the thread diameter, then subtracting 1/4".

## Source

- https://brennaninc.com/connection-types/

Last verified: 2026-08-13. Review by: 2028-08-12.
Part of [Hydraulic and pipe connection type identification](https://referencesource.org/hydraulic-pipe-connection-types/).