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AN hoses are the gold standard in reliable sealing and sheer function, and nearly faultless when assembled and installed correctly. Gentle arcs of stainless steel routing life-giving fluids about an engine bay between red-and-blue terminals of exquisitely finished aluminum make for a beautiful sight. However, assembling the damned things requires the patience of a Shaolin monk, and every so often, a razor-tipped barb sticks out of the housing, slips under your nail into nerves and blood vessels, and makes you cuss like a sailor. And stainless braid is heavy stuff, not something ounce-conscious users are likely to approve of.

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Gordon’s recent post about the strange and elusive numbering scheme for machine screws brought another one to mind, gleaned from Carroll Smith’s Nuts, Bolts, Fasteners and Plumbing Handbook. 37° AN lines are a pretty common sight for lots of high-performance and show vehicles these days, courtesy of their excellent sealing performance and reusability. But how do you plan line sizes without really knowing the dimensions of a given fitting and its hoses?

Turns out, it’s pretty simple. The lines are sized with labels like -3AN up to around -20AN (standards up to -32AN exist, but the fittings are very rare). To determine the hose inner diameter for a specific AN size, just multiply the prefix by 1/16″. For instance, -10AN:

10(1/16″) = 10/16″ = 5/8″ inner diameter.

Thread sizes and hex dimensions are also standardized, as Wikipedia and Powerhouse’s AN wrench selection show us.

AN Thread Specs [Wikipedia]
AN Hex Wrenches [Powerhouse]

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