AN to M Fittings

Q: What is an AN to metric adapter used for?

An AN to metric adapter connects an AN hose or fitting to a compatible component with a metric threaded port. It allows builders to retain an original metric fuel filter, transmission component or selected power steering connection while routing part of the system with AN lines. The adapter does not make unrelated threads interchangeable. The AN size, metric diameter, thread pitch, connection gender and sealing method must all match.

Q: Are AN and metric threads interchangeable?

No. AN fittings use standardized UNF threads together with a 37 degree flare sealing surface . Metric threads are identified by their nominal diameter and pitch in millimeters, such as M14×1.5. A metric fitting may appear close to an AN thread but still have a different diameter, pitch or sealing seat. Forcing the connection can damage the threads without producing a dependable seal.

Converting an original metric port to an AN line should not require replacing the entire fluid system. Evil Energy metric adapters create a direct transition between compatible metric ports and AN adapters for custom fuel lines, transmission oil cooler lines, fuel filters and selected power steering applications. Choose by the actual port specification and sealing method rather than vehicle make alone.

How Do You Choose the Correct AN to Metric Adapter?

Confirm five details before ordering: the AN size, metric thread diameter, thread pitch, male or female connection and seal type. This collection includes AN sizes from 3AN through 12AN and metric options spanning M6×1.0 through M24×1.5, including commonly searched M10, M12, M14, M16 and M18 options. Available pairings vary, so use the product selector to verify the exact AN and metric combination. If you still need to identify the AN side, review the AN hose and fitting size guide before choosing an adapter.

Match the Port Gender, O Ring Seal and Application

Evil Energy offers general male AN flare to male metric adapters, 6AN adapters with metric O ring connections, and dedicated fittings for listed 1987 to 1998 GM TBI and Vortec truck applications. The AN connection seals at its 37 degree flare, while the listed metric side uses the specified O ring sealing surface. Match the component port, inspect its sealing seat and confirm the selected product rating before installation. For the rest of the line, compare compatible AN fittings or complete the routing with the appropriate automotive hose and line.

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FAQs about AN to M Fittings

What is an AN to metric adapter used for?

An AN to metric adapter connects an AN hose or fitting to a compatible component with a metric threaded port. It allows builders to retain an original metric fuel filter, transmission component or selected power steering connection while routing part of the system with AN lines.

The adapter does not make unrelated threads interchangeable. The AN size, metric diameter, thread pitch, connection gender and sealing method must all match.

How do I choose the correct metric adapter for my AN line?

Identify the two sides separately.

Confirm the AN size already used by the hose end or mating fitting.
Measure or verify the metric port diameter and pitch, such as M12×1.5 or M14×1.5.
Confirm whether each connection is male or female.
Identify whether the metric port seals with an O ring, sealing washer or another specified seat.
Select the exact combination shown in the product selector.

Do not choose a metric thread adapter using diameter alone. M12×1.25 and M12×1.5 have the same nominal diameter but different thread pitches.

Are AN and metric threads interchangeable?

No. AN fittings use standardized UNF threads together with a 37 degree flare sealing surface. Metric threads are identified by their nominal diameter and pitch in millimeters, such as M14×1.5.

A metric fitting may appear close to an AN thread but still have a different diameter, pitch or sealing seat. Forcing the connection can damage the threads without producing a dependable seal.

Do AN to metric adapters need thread sealant or PTFE tape?

The AN to M Fittings in this collection are listed with a 37 degree flare seal on the AN side and an O ring sealing surface on the applicable metric side. These surfaces create the seal; the straight threads primarily hold the connection together.

Do not apply PTFE tape to an AN flare or O ring sealing surface. Inspect the flare and O ring, lubricate the O ring only with a fluid approved for the application, and follow the component manufacturer’s installation instructions. After assembly, test the system at controlled pressure and inspect every connection before operation.

Can the same AN to metric adapter be used for fuel, oil, transmission fluid and power steering?

Not automatically. A matching thread size does not confirm that an AN to metric adapter is suitable for every automotive fluid system. Before ordering, check the selected product’s published application, pressure and temperature ratings, sealing material and compatible fluids.

Evil Energy offers metric adapters for different applications. The general male AN flare to male metric adapters list fuel lines, fuel filters and transmission oil cooler applications, while the dedicated 6AN O ring models list fuel filter and power steering uses. Choose the adapter by both its thread specification and stated application rather than using one fitting across every system.

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AN to M Fittings

How Do You Choose the Correct AN to Metric Adapter?

Match the Port Gender, O Ring Seal and Application

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