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What size thread for 3/16 brake line?

When it comes to 316 stainless steel brake lines, selecting the appropriate thread size is crucial for ensuring a secure and reliable connection. The thread size you choose will depend on the specific application and the components you're working with. In this article, we'll provide a detailed guide on how to determine the right thread size for your 316 brake line.


Understanding Thread Sizes for 316 Brake Line


The most common thread sizes used for 316 stainless steel brake lines are 3/16-24, 1/4-20, and 5/16-24. These numbers refer to the diameter of the thread (in inches) and the number of threads per inch. For example, a 3/16-24 thread size has a diameter of 3/16 inches and 24 threads per inch.


The thread size you choose will depend on the specific components you're connecting, such as the fittings, adapters, or other hardware. It's important to ensure that the thread sizes of all the components match to create a secure and leak-free connection.


Factors to Consider When Choosing Thread Size



  • Brake Line Diameter: The diameter of your 316 stainless steel brake line will determine the appropriate thread size. Smaller diameter lines (3/16 inch) typically use a 3/16-24 thread, while larger diameter lines (1/4 inch or 5/16 inch) may require a 1/4-20 or 5/16-24 thread size.

  • Fitting and Adapter Compatibility: Make sure the thread size of your brake line fittings and adapters matches the thread size of the components you're connecting. This will ensure a proper fit and prevent leaks.

  • Application and Pressure Requirements: Consider the specific application and the pressure requirements of your brake system. Higher-pressure systems may require a larger thread size to ensure a secure and reliable connection.


By taking these factors into account, you can determine the appropriate thread size for your 316 stainless steel brake line and ensure a safe and effective installation.

What thread size are brake lines?


Normally, a 7/16 fine thread is 7/16-20. The threads for 1/4" brake lines where a rubber hose screws into a wheel cylinder with a copper gasket ARE the 7/16-20 standard fine thread. 3/16" lines use standard 3/8-24 threads for both the flare nuts and the gasketed fittings.



Should I use 3/16 or 1/4 in brake line?


When a replacement line is needed, the obvious question is what size brake line to get. The answer is really pretty easy. Almost every car or truck worldwide utilizes a 3/16-inch brake line, also referred to as a CNF-3.



Why are copper brake lines illegal?


The Society of Automotive Engineers determined the corrosive deterioration of the steel brake line was at fault. The industry switched to brake lines made from 100% copper. These lines burst from the pressure causing even more accidents. People demonized the copper brake lines.



What thread size is 3 16 flare?


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Inverted Flare Thread Specifications
Dash SizeTube O.D. (in)Male Thread O.D. (in)
21/85/16
33/163/8
41/47/16



What is bigger, 3 16 or 1/4?


But now with the same denominator. We're just going to compare the numerators. And 4 is larger than 3 so 4 16 that's larger than 3 16. And therefore one-fourth that is larger than 3 16..



What size are copper brake lines?


Brake Pipe Characteristics:
This product is constructed from soft copper tubing and is suitable for use in braking automotive systems. It has an outer diameter of 3/16" / 4.76mm and a wall thickness of 0.028" / 0.71mm.



How to measure 3/16 brake line?


You can also use a 1/4" open end wrench to gauge your lines. It will fit easily onto 1/4" line and will bang back and forth on 3/16" line. A stack of three pennies is about 3/16" thick and three pennies and a nickel are around 1/4" thick. On some late model GM and most European built cars the larger line will be 6mm (.



What size threads are on a 3/16 brake line?


Imperial Sizes:

Line SizeOuter Diameter (OD)Thread Pitch
3/16"0.1875"24 TPI
1/4"0.25"24 TPI
Mar 30, 2012



What type of fittings are used on brake lines?


Here are the most common types:

  • Double Flare Fittings: These are widely used in automotive brake systems.
  • Bubble Flare Fittings: Bubble flare fittings, also known as single flare fittings, are commonly found in European vehicles.
  • AN (Army-Navy) Fittings: AN fittings are used in racing and high-performance applications.



What is the wall thickness of a 3 16 brake line?


0.028 inches
Product specifications

Part Number‎LTSC325KIT
Nominal Wall Thickness0.028 inches
Outside Diameter‎0.19 Inches
Item Length‎300 Inches
UPC‎811701032753


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.