What is this hose fitting?

[Dave Sherman]

Trying to find an elbow fitting that mates with this. It's a hydraulic hose that goes on a 1947 Lincoln power window pump. Is it NPT?

 

[mk378]

That looks like inverted flare (male threads on the tube side, like brake lines have). The nut spins on the tube, right?

 

[Dave Sherman]

Yes, the threaded part turns, and the tubing it turns on is flared.

 

[clinebarger]

SAE Inverted Flare, You can find charts online to figure out the size.

 

[Dave Sherman]

Many thanks! Long story, but the elbow that came with the hose left with the pump that was to be rebuilt. The pump became a core. Oops.

 

[grasscutter]

Looks like 5/8"-18.

 

[mk378]

The threads on flare fittings are typically standard bolt sizes, but that is not how they catalog the fittings. They are specified by the OD of the tube (before flaring).

 

[50yr Street Mech]

Imagine that in a 2026 model of any vehicle. Hydraulic power windows. Bet they would outlast an electric motor power window any day !