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What is a 45 degree versus a 37 degree flare?

April 26, 2017degree flare versus

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What is a 45 degree versus a 37 degree flare?

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All factory produced automobiles use the industry standard, which is a 45 deg. double flare using one flare fitting. The double flare is stronger and needs no support sleeve. 37 deg or AN, which stands for Army/Navy standard, is used on military equipment and for non-automotive uses. When using AN on automotive components (masters, wheel cylinders), each AN fitting must be used with an adapter, a sleeve and a nut with a single flare.