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Old 12-31-2007, 09:42 PM   #2 (permalink)
jgarden
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Re: o-ring sizes, can we get a "sticky"

Here is some info (credit goes to Calico5 - from an old post he made):

The o-rings on the HPOP system are standard SAE straight-thread ORB (o-ring boss) type.

For the -6 fitting (the ones on the HPOP) the o-ring is a "-906" (.468" id x .078" wd).

For the -5 fitting (the ones in the heads), the o-ring is a "-905" (.414" id x .072" wd). The durometer (hardness) should be 90 for all ORB o-rings.

These o-ring numbers are specific to the SAE o-ring boss fittings. "Regular" o-ring numbers and dimensions are slightly different (although, in a pinch, a "regular" one will work!)

Viton is the prefered material, however BUNA-N will work, but the temp. rating is limited to about +230*F (viton's good to +400*F).

The ORB o-rings are generally available from any good hydraulic or industrial equipment supplier. HERE is one source (scroll down the page a bit!).


I was thinking of making up a www page with all the oring sizes. All I need is TIIIIIIIIIIIME.
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Jack
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