There is no set conversion, you can get AN to pipe thread adapters in a wide range of combinations. There is no one NPT size which corresponds to a given AN size and it varies vendor to vendor.
For instance, XRP makes NPT to -8AN adapters with 1/4, 3/8, 1/2, and 3/4" pipe NPT sides.
One issue to watch for though is usually for any given size AN adapter, the smallest NPT adapters will have less than optimal ID's because the pipe thread size is on the small side.
Case in point, take a 1/4" NPT to -8AN adapter. The nominal ID of -8AN is 1/2". However, 1/4" pipe thread is only .540" OD; by the time you subtract the wall thickness of the fitting from that .540" it is no longer a "full flow" adapter fitting.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
Last edited by Blown353; 11-29-2008 at 06:42 PM.
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