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1/4 bsp x 19 threads come in tapered and parallel. I was given 2 petcocks from a Matchless Mattisse for an aluminum fuel tank i built and my thread gages didn't have 19 tpi. Had to do some research on that. . FWIW, I just looked in my Aeroquip- How To Identify Fluid Ports And Connectors booklet and...

robtg wrote:
BSPP ---- British standard parallel pipe threads used on petcocks and bulkhead fittings use nuts.

I did not know those were BPP.

I'm not familiar with 5x.9 metric bolts. The ones I've seen are 5x.8. Is there really a .9 or is that a typo? Chuey There really is a 5X.9. That is just a sick joke to play on mechanics. At least now I know. Who thought of making two thread pitches with the difference being just one tenth of a mill...

Maybe they make one size fits all, cut to fit?

Oooo, that seems like a very good idea . . . BUT, you mean "solid-core," don't you? you wouldn't want flux getting squeezed out in there. :shock: Does sound a bit messsie, doesn't it? I have tried solid core for mesureing squish and it just doesn't work very well. Actually I have had no m...

If you use used thrust bearings, make sure they are flat flat. Sometimes they are a close fit on the locating pins. If care isn't taken removing them, that is: working them off each pin a little at a time, they will bend very slightly. This can make make the measurement misleading. I found this out ...

Chuey wrote:I'm not familiar with 5x.9 metric bolts. The ones I've seen are 5x.8. Is there really a .9 or is that a typo?

Chuey

There really is a 5X.9.

My factory /7 manual calls for .00059"-.00102'. So basically a half to one thousanth. Can you feel a thousanth? I think if you can feel play, they are loose.
A good automotive machine shop, will be one that re-sizes rods and will be able to take care of your needs.

A good automotive machine shop can press the bushings in and fit them to your pins.

The size of the pin hole diameter only needs to be increased a few thousanths of an inch to be the right size for a 5mm .90 tap hole. The threads can be removed from the end of a 5mm bolt, making it 4mm like the original pin to engage the bearing. The only other thing is to flatten out an area surro...