07-04-2008, 08:10 AM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
Dividing the AN number by 16 only gives you a rough idea of the actual inner diameter size. An AN-12 hose is not EXACTLY 3/4" in diameter so don't try to push an AN-12 hose onto a 3/4" hose fitting. That's why you can also find actual 3/4" braided steel hose for heater use, etc. The two hoses are not interchangeable. Conversely, don't try to use 3/4" braided hose with an AN-12 fitting. As already posted, the AeroQuip site has a handy sizing guide to help you.
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AN sizing
following are some specifics. As was said, the dash number is pipe size in 1/16". ID for -10 and -12 AN hose is 9/16" and 11/16", respectively. I think Carroll Smith covered this subject in depth in his book on Racing Hardware.
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