Holset H1C oil feed size ?

[joeuser528e]

I've got a 16cm^2 holset H1C here, with an unknown oil inlet size.

From my internet research it appears that it's a 12mm x 1, 12mm x 1.25, or a 12mm x 1.5. Does anybody know for sure?

I've also got a pair of different M > F inlet adapters (also of unknown sizes) that screw right in, but I'm not sure how to measure the other dimension (or what it means honestly).
http://img.photobucket.com/albums/v204/JoeUser11/m20turbo/HPIM0616.jpg
(Gold adapters in the picture). If I could measure whether they are 1, 1.25 or 1.5 that would also solve my problem.

[Def]

First number is the diameter of the tip of the threads in the female part I believe(the male parts will usually be just under this - like 11.9mm). The second number is the spacing between threads. So M12 x 1.0 mm will be about 12mm in diameter, and each thread will be 1mm from the other one. M12 x 1.5mm is a coarser thread of the same diameter, with each thread being 1.5mm from the next one.

Wikipedia has more I'm sure if you're still lost.

[Pinepig]

12x1.5 FTW ( and the correct answer )

[joeuser528e]

Ah great! Thanks for the help!

[matt325is]

My H1C has a metric striaght o-ring thread. I didn't have the necessary adaptors, so I had an awesome welder braze two fittings together, no leaks.

matt

[Def]

Oh yea, forgot to mention that - use an o-ring on the part of the adapter that screws into the Holset. I don't know if you can deform a copper washer with that fitting enough to get it to seal, but an o-ring should be fine.