![]() ![]() As examples, -3 AN line is 3/16 inch, -8 is ½ inch. Called dash numbers, they equate to 1/16 inch. ![]() The AN system uses a number to identify the various sizes of metal tubing and the corresponding fittings, and the same numbers are also assigned to the hose and their ends. Again, sealant should only be used on the pipe thread portion. Commonly found on AN plumbing is a 37-degree-to-pipe thread adapter. (The reference “AN” stands for Army/Navy and it’s a system that was developed by the government to ensure interchangeability and compatibility of parts made by various manufacturers.) AN fittings use tubing with 37-degree single flares with reinforcement sleeves (37-degree flares will also be found on JIC hydraulic fittings). ![]() While they aren’t used on production automobiles, AN fittings are often found on hot rods and race cars. If used, sealant should only be applied to the pipe threads. The tube’s flare is clamped between the nut and the seat in the fitting when screwed together so when the assembly is tightened, a leak proof metal-to-metal joint is created and no sealer or Teflon tape is necessary.įound on virtually every brake system with 45-degree flares is an inverted seat to pipe thread adapter. That means the tubing is flared and then folded back on itself for increased strength and resistance to cracking. The most common type of hydraulic connections found on automobiles is the SAE 45-degree double-inverted flare. Read More: Everything You Need To Know About Brake Fluid For Your Hot Rod The combination of the nut, tapered tubing, and the seat in the fitting provide a leak-free seal. This is the seat in an inverted flare fitting. It is true that some stainless steel tubing will crack when forming double flares, however it can be done if the appropriately annealed tubing is used. The second misconception is that stainless steel brake lines cannot be double flared. These types of fittings do not require thread sealer. SAE-inverted flare fittings have a sealing surface that matches the 45-degree angle of the tubing. The bigger tubing will carry more volume, so 1/4-inch line may be preferable in some instances, disc brake calipers with large piston displacements, as an example. Brake lines are most often 3/16 or 1/4 inch in diameter and the only difference is the amount of fluid delivered. Pressure in the brake system is created by the master cylinder and the brake lines deliver it. The first is that there is a relationship between brake line size and hydraulic pressure-not true. There are two common misconceptions about brake lines. The angle of the sealing surface is 45 degrees. ![]() The tubing is folded back onto itself to make a thick seat that is unlikely to crack. This is an example of an inverted double flared brake line. NiCopp is unique as it has the strength and structural integrity of steel lines but with the added benefit of being much more corrosion-resistant, and it bends easier. There are only three choices when it comes to brake lines-steel (usually with a tin coating to prevent rust), stainless steel (that is often polished), or nickel/copper (NiCopp) tubing that meets SAE Standard J1047 and ISO 4038, meeting all international and U.S. It includes a 25-foot roll of tubing, 3/8-24 inverted flare threaded tube nuts, and a Titan flaring tool.Ī brake system may produce well over 1,000 psi in operation, which requires brake lines, hoses, and fittings that can withstand pressure reliably-that means no copper or aluminum tubing. Now available from Speedway Motors is this nickel/copper (NiCopp) inverted flare brake line kit. ![]()
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