Sealing rings for oil pressure adapter block - 1/2"?

[Jonny042]

PET lists these as part #90012310130, 12 x 18 sealing ring. I've got plenty of 12mm sealing rings, but they won't fit over the bolt. Next size up, 14mm, is too sloppy.

If I didn't know any better I'd say this was a half inch thread? What gives? I'm going to see if maybe I can ream out a 12mm to make it work before I start looking on the McMaster-Carr website......

[john walker's workshop]

The ones I get from Global Metrics are 12X16X1.5. Actual inside measurement is 12.3. I measured the same fitting here and it's 11.9mm/0.47".

[Jonny042]

Originally Posted by john walker's workshop

The ones I get from Global Metrics are 12X16X1.5. Actual inside measurement is 12.3. I measured the same fitting here and it's 11.9mm/0.47".

Thanks, John! - Really not sure what's up with this - my sealing rings are the same ID as yours, 12.30 or so, but that damn fittiing is 12.66 or so. (Late SC block) It won't thread into the other side of the block, and if I take the adapter fitting from the other side and test fit it in the threads it's a loose fit. Definitely not the same size thread. I guess it must be some odd metric pipe thread? Who knows.

Anyway, a few minutes with a round jewlers file to open up the id of some 12mm sealing rings did the trick and I'm on my way toward the next thing that doesn't fit, or is buggered up in some way. The latest is the 8mm banjo bolts at the tensioners, someone made sure they were tightened enough that the holes in the banjo bolt are oval!!

Thanks again - you've been a huge help over the years, if not to me directly, your thoughtful responses to other's questions along the way have helped many times.