The right AN-to-hardline fitting depends on the tube’s outside diameter and whether the AN connection needs to be male or female. These five options cover 1/4-inch, 5/16-inch, and 3/8-inch hardline, with -6AN connections. The EVIL ENERGY 3/8-inch adapter suits a common single-size setup, while its mixed-size option can help when working with two tube diameters. Measure your hardline and verify the flare connection before ordering.
| Fitting | Hardline size | AN connection | Best for |
|---|---|---|---|
| EVIL ENERGY adapter | 3/8 inch | -6AN male | Standard 3/8-inch tube connections |
| EVIL ENERGY adapter | 5/16 inch | -6AN male | Smaller 5/16-inch hardline |
| EVIL ENERGY mixed-size adapter | 3/8 and 5/16 inch | -6AN male | Projects using either listed tube size |
| EVIL ENERGY adapter | 1/4 inch | -6AN male | Small-diameter hardline |
| Podavelle adapter | 3/8 inch | -6AN female | Setups requiring a female flare end |
EVIL ENERGY 3/8-Inch To -6AN Male Adapter
This two-piece EVIL ENERGY set connects 3/8-inch outside-diameter hardline to a -6AN male flare. The fitting is made from aluminum alloy and uses a brass ferrule. Its 6AN thread is listed as 9/16 UNF, and the flare connection seals at a 37-degree angle.
Best for: Buyers connecting 3/8-inch hardline to a matching -6AN female connection. It was selected as a direct option for this common tube size. Check first: The adapter is specified for 3/8-inch OD hardline, so measure the tube rather than relying on its nominal application.
EVIL ENERGY 5/16-Inch To -6AN Male Adapter
This two-piece fitting is designed for 5/16-inch OD hardline and has a -6AN male flare with a 9/16 UNF thread. EVIL ENERGY lists an aluminum alloy body, brass ferrule, and 37-degree flare sealing surface.
Best for: A hardline installation measured at 5/16 inch that needs a -6AN male end. It offers the same general construction and flare style as the 3/8-inch option, but for a smaller tube. Check first: It is not identified for 3/8-inch or other tube sizes; confirm the outside diameter before choosing it.
EVIL ENERGY Mixed-Size -6AN Male Adapter
This EVIL ENERGY adapter is listed for 3/8-inch and 5/16-inch hardline, with a -6AN male flare and 9/16-18 UNF thread. Its aluminum alloy fitting and brass ferrule provide the compression-style tube connection; the AN flare seals at 37 degrees.
Best for: Buyers comparing fittings for either of the two listed tube sizes or maintaining a parts selection for both. The two-size listing makes it more flexible than a single-diameter option. Check first: Verify which tube size the specific fitting accommodates and measure the hardline; do not assume one adapter fits both diameters at once.
EVIL ENERGY 1/4-Inch To -6AN Male Adapter
This adapter connects 1/4-inch OD hardline to a -6AN male flare. The listed construction is aluminum alloy with a brass ferrule, and the flare seals at a 37-degree angle. The 6AN thread is specified as 9/16 UNF.
Best for: Installations using measured 1/4-inch hardline that need a -6AN male connection. It fills a smaller-tube requirement not covered by the 5/16- or 3/8-inch choices. Check first: This product is specified for 1/4-inch OD tube, not larger hardline.
Podavelle 3/8-Inch To -6AN Female Adapter
Podavelle’s two-piece fitting connects 3/8-inch OD hardline to a -6AN female flare with a 9/16-18 UNF specification. It has an internal brass ferrule and a 6061-T6 billet aluminum body with an anodized finish. The listing describes use with fuel, oil, transmission, and power-steering systems.
Best for: Buyers whose connection specifically calls for a female -6AN flare rather than the male ends on the other choices. Check first: Confirm that your mating connection is male -6AN and that the hardline measures 3/8 inch OD.
Buying Guide: How To Choose An AN-To-Hardline Fitting
What hardline size should you choose?
Measure the tube’s outside diameter with a suitable measuring tool. These options specify 1/4-inch, 5/16-inch, or 3/8-inch hardline. Those sizes are not interchangeable: a compression fitting intended for one diameter should not be selected based only on appearance or the system’s general application.
Do you need a male or female AN end?
Match the fitting end to the component or hose connection it will join. The EVIL ENERGY options above have male -6AN flares. The Podavelle option has a female -6AN flare. Check both the AN size and the mating end before purchasing.
Why check the flare and thread details?
AN size and thread details identify the connection, while the flare surface provides the sealing interface. The listed -6AN male EVIL ENERGY fittings use a 37-degree flare and 9/16 UNF thread specifications. Confirm the corresponding fitting is designed to mate with the adapter; do not rely on thread diameter alone.
What should you verify before installation?
- Confirm hardline outside diameter and whether the tube is compatible with the compression-style fitting.
- Match the required AN size and male or female flare configuration.
- Review the material and ferrule details for the specific product.
- Follow the fitting maker’s installation instructions and check the assembled connection for leaks before use.
Frequently Asked Questions
Is -6AN the same as a 3/8-inch hardline?
No. The hardline measurement describes the tube’s outside diameter, while -6AN describes the flare connection size. A fitting can connect the two, but the measurements refer to different ends.
Can a 5/16-inch adapter fit 3/8-inch hardline?
The listed 5/16-inch adapter is specified for 5/16-inch OD hardline. Choose a fitting listed for the tube’s measured outside diameter instead.
Does every option here have a male AN end?
No. Four listed options have -6AN male connections, while the Podavelle 3/8-inch option has a -6AN female flare.
How does the AN flare seal?
The EVIL ENERGY male adapters specify a 37-degree flare sealing surface. Match that interface with a compatible mating connection and follow the product instructions.