# SAE J1926 Straight Thread O-Ring Boss (ORB) — Hydraulic and pipe connection type identification

For SAE J1926 Straight Thread O-Ring Boss (ORB), governing standard is SAE J1926; region of origin is American Connections; thread type (tapered or parallel) is straight thread; seat or flare angle is flat surface; seal method is The male connection is a straight thread with an O-ring. The female port has a straight thread and a machined surface to provide a smooth, flat surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection, recorded from its source on 2026-08-13.

- **Connection type:** SAE J1926 Straight Thread O-Ring Boss (ORB) _(verified: appears in the quote below)_
- **Governing standard:** SAE J1926 _(verified: appears in the quote below)_
- **Region of origin:** American Connections _(our reading, not quoted from the source)_
- **Thread type (tapered or parallel):** straight thread _(verified: appears in the quote below)_
- **Seat or flare angle:** flat surface _(verified: appears in the quote below)_
- **Seal method:** The male connection is a straight thread with an O-ring. The female port has a straight thread and a machined surface to provide a smooth, flat surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection. _(verified: appears in the quote below)_

## What the source says

> SAE J1926 Straight Thread O-Ring Boss (ORB) is recommended by the National Fire Protection Association (N.F.P.A.) for leak prevention in medium and high pressure hydraulic systems. The male connection is a straight thread with an O-ring. The female port has a straight thread and a machined surface to provide a smooth, flat surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection. This is also considered a mechanical connection.

## 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/).