# SAE J512 45° — Hydraulic and pipe connection type identification

For SAE J512 45°, governing standard is SAE J512; region of origin is American Connections; thread type (tapered or parallel) is straight thread; seat or flare angle is 45°; seal method is The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet, recorded from its source on 2026-08-13.

- **Connection type:** SAE J512 45° _(verified: appears in the quote below)_
- **Governing standard:** SAE J512 _(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
- **Seat or flare angle:** 45° _(verified: appears in the quote below)_
- **Seal method:** The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet. _(verified: appears in the quote below)_
- **Interchangeability notes:** dash sizes: -02, -03, -04, -05, -08, and -10 of SAE 37° and SAE 45° have the same threads, but NOT the same seat angles. Intermixing the two different types of fittings will result in leakage

## What the source says

> SAE J512 45° connections are used in automotive, refrigeration and truck pipe systems. These connectors are typically brass material. The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet. This is a mechanical connection also.

## 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/industrial-cross-reference-bearings-seals-fittings/).