EVIL ENERGY Male to Metric Inverted Female Flare Thread Fitting Adapter Straight Silver 1PC/2PCS

About this item

The performance brake market in the United States runs on AN threads. Your car does not. Adjustable proportioning valves, hydraulic handbrake cylinders, braided lines and gauge blocks all arrive with 3/8-24 or 7/16-20, while the factory ports on a Japanese or European chassis are M10x1.0 or M10x1.25. This metric brake line adapter is the joint between those two worlds, and it lets the factory hardline stay exactly where it is.

Both ends in one view. The pointed end is the 37-degree AN male cone. The open end is the metric inverted flare female seat. Compare the female seat against your own line before installing.

AN male cone. This face is the entire seal on the AN side. It should reach you unmarked. Any nick across the cone is a leak path and the fitting should not be installed.

Metric female seat. A machined cone, not a flat shoulder. Your flared tube end presses directly against this surface. If your line has a raised ring rather than a folded funnel, you have a bubble flare and need a different part.

Wrench flats and overall length. Hex sized for a standard flare nut wrench. Length is kept short so the adapter adds minimal offset at a master cylinder or handbrake cylinder port where clearance is usually tight.

Metric Brake Line to AN Conversion: What M10x1.0 and M10x1.25 Actually Fit

Both M10x1.0 and M10x1.25 are used on 4.75mm metric brake line, which is dimensionally interchangeable with 3/16 inch line. The thread does not tell you the tube size. What separates the two is pitch, 1.0mm against 1.25mm between crests, and they are close enough to start cross-threading if forced.

On the AN side, 3AN is 3/8-24 UNF and 4AN is 7/16-20 UNF, both sealing on a 37-degree cone. Four combinations are available so the AN size can follow the line you are running rather than the port you are leaving.

Use a thread pitch gauge rather than judging by eye. On a metric brake system the two pitches look identical across the threads, and the difference only shows up as a joint that will not seat.

Bubble Flare vs Inverted Flare: How to Check Before You Order

Matching the thread is half the job. M10x1.0 exists in more than one seat geometry and they are not interchangeable, which is the single most common reason a metric brake adapter comes back.

A bubble flare, common on European systems and on many Bosch ABS units, forms a raised ring set back from the end of the tube. A double or inverted flare folds the tube end back into itself and reads as a small funnel. Both take the same M10 tube nut, so the nut tells you nothing. European standards name them directly: DIN 74234 Form E is the inverted flare, Form F is the bubble or convex flare.

Take a flashlight to the end of your line before ordering. Funnel means inverted flare. Raised ring means bubble flare. Ten seconds now, or a return later.

Hydraulic Handbrake, Proportioning Valve and Caliper Line Fitment

The most common use for a metric to AN brake adapter is a hydraulic handbrake install. Aftermarket handbrake cylinders ship with AN or SAE ports while the factory line feeding the rear circuit is M10, and interrupting that circuit creates a transition at each end. Plan for at least two.

Beyond that: master cylinder outlets, adjustable proportioning valves, distribution blocks, and the hardline to flexline transitions on a track brake conversion. Many metric calipers use a banjo port rather than a threaded port, and for those the metric stainless banjo bolt is the correct part instead.

ABS modules need a separate word. Many use M10x1.0, so the thread often matches, but a large share are bubble flare rather than inverted flare. Confirm the seat before ordering for an ABS port specifically.

Stainless Steel Metric Brake Fittings and Why the Seat Finish Matters

On a fitting that seals entirely on cone surfaces, surface finish is the seal. UNS S30300 is a free-machining stainless grade, chosen because it holds a cleaner finish and tighter concentricity on small-diameter cone work than tougher grades do. On a 4.75mm joint, that finish decides whether the seat mates across its full face or touches in three places.

Stainless matters more on a metric car than most people expect. Factory metric brake fittings are usually plated steel, and after a few winters they seize into whatever they thread into. A stainless steel brake fitting comes back out the next time the system does, which is the difference between removing a proportioning valve and destroying one.

How Many M10 to AN Brake Adapters Do You Need

Count the transitions in your plan, not the components.

One covers a single tap, such as a gauge feed or one end of a handbrake circuit. Two covers most real jobs, because brake transitions arrive in pairs: a master cylinder has two outlets, a circuit has two ends, and a left and right caliper feed are a pair by definition.

If you are unsure, take the two pack. A build stopped on a Saturday because one fitting is short costs more than the fitting, and an unopened stainless adapter has no shelf life.

What Is In The Box

• 1x or 2x AN Male to Metric Inverted Flare Female Adapter, depending on the pack you select

What You Will Also Need

• A correctly flared tube end and its matching M10 tube nut on the metric side. Not included, and a metric flare needs a metric-capable flaring tool
• An AN hose end or hardline sleeve on the AN side. See the full EVIL ENERGY AN fitting.
• Fresh brake fluid and bleeding equipment. Any joint opened must be bled
• If the line has to split to two circuits, the 3AN brake tee block with mounting tab handles the branch

Why Choose EVIL ENERGY M10 to AN Brake Adapters

• The Factory Hardline Stays: The component stays, the line stays, only the connection changes. The cheapest possible route to running AN hardware on a metric chassis.
• Two Geometries, One Body: A 37-degree AN cone and a metric inverted flare seat machined into a single piece, so there is no stacked adapter and no extra joint to bleed or inspect.
• Nothing to Get Wrong on Install: No tape, no sealant, no O-ring to source or replace. Both ends seal on metal. What ships is what installs.
• Four Thread Combinations: 3AN or 4AN paired with M10x1.0 or M10x1.25, all suiting 4.75mm or 3/16 inch line, so the AN size follows the line you are running.
• Built for Metric Chassis: Stainless throughout, for cars where every factory brake fitting is plated steel and every one of them is going to seize eventually.

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Effective from August 25, 2024. Price drops within 7 days of purchase can be claimed.

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