A Guide to Automotive Fluid Lines, Connections, and Fittings (2024)

Consider the fact that there are more than 30 quarts of fluid pumping or pressing throughout your vehicle at any given time – and that’s not even including the fuel system. That is a lot of fluids to keep sealed in their respective circuits, and it’s extremely important as some of those fluids are flammable while others could cause system issues or failures on the road if left unchecked. Not to mention just the annoyance of a puddle on the garage floor.

To keep all of these different fluids sealed tight, every hose, fitting and connection must be prepared and used correctly, and there are a lot of different clamps, flares, adapters, and fittings to consider. We decided to take a look at the tools and products available to help you plumb and seal the brakes, fuel systems, fluid lines, and other hoses on your car or truck to keep each system functioning properly and safely.

Most automotive hard line connections revolve around two style of flares, a 45-degree or a 37-degree. The 45-degree inverted flare is an SAE (Society of Automotive Engineers) standard found on hard lines for brakes, transmission lines and older fuel systems. These are double flared (a two-step process) and use an inverted flare fitting. The 37-degree flare derived from use in the Army and Navy, hence its name – the AN fitting – and it has a single flare. Obviously, these two flare styles and their fittings shan’t be intermixed.

To create hydraulic pressure, the brake system must be 100-percent sealed tight, which is why it is so important to use the correct fittings when building brake lines. Wilwood offers a number of fittings and adapters to help you complete your custom brake lines correctly, including chassis adapters, banjo fittings, flex lines and NTP-to-AN adapters. Learn more at wilwood.com/LineKits.

The great thing is that with a little effort on your part, you can produce both style of connections at home to fix a pesky connection or build an entirely new brake system, fuel system, or oil cooler lines. At first, shopping for fittings or flares may seem intimidating, but each manufacturer can break it down to the parts you’ll need for your application. Once you set about the bending, flaring, fittings and routing of one fluid system, you may find yourself looking to update another part of your car!


Flex and Fittings

For obvious reasons, one can never underestimate the need for proper connections throughout the brake system – and there are a lot of connections! When it comes to getting brake fluid to the caliper, Wilwood recommends running new stainless steel hoses for the best hydraulic fluid connection.

Whether you’ve stepped up to one of Wilwood’s disc brake setups or not, the company offers a variety of vehicle-specific braided stainless steel brake line kits. These premium-grade flex lines are durable and provide an improved brake pedal feel compared to original rubber lines. The -3AN lines are terminated with various inverted flares, metric, banjo, or AN ends to mate factory hard lines with Wilwood calipers or adapter fittings. Each line kit is supplied with all the required fittings to complete the installation on a specific vehicle – check out wilwood.com/Linekits for all the details.


Summit Racing Equipment

Flare Like a Pro

If you’re going to custom plumb your fuel system hard lines or perhaps a complete brake system, do yourself a favor and invest in a professional flaring tool. The consistency and quality of each flare will make it worthwhile knowing everything will fit and seal properly.

Summit Racing Equipment offers a couple different Pro Flaring Tools to form either 37- or 45-degree single-, double-, or bubble flares on 3/16-, ¼-, 5/16-, and 3/8-inch diameter OE steel, stainless steel, and soft metal tubing. The ‘turret-style’ design allows you to make precision flares and the T-handle screw clamp secures the line in place while forming. The dies are mounted right on the turret—no fumbling around for small parts or worrying about missing dies and the tools come in a sturdy storage case to keep everything together when not in use.


Sidebar – Fittings

Here are some different fittings and their common uses that you’ll find within high pressure fuel systems, transmission cooler lines or other oils (left to right):

A – AN 90-degree hose fitting. This fitting is used on the end of a stainless high pressure line. The fitting pointing down is installed to the hose, the female fitting pointing right connect to male AN fitting. All AN fittings are 37-degrees

B – NPT to male AN on top, NPT to a hose nipple below. Both are common on fuel systems and oil coolers in order to adapt NPT female ports to accept an AN fitting or hose end.

C – O-Ring Boss to AN. The O-Ring Boss fitting shares the same straight threads of an AN fitting but seals against a flat, machined surface with an O-ring to produce the seal. Installation is simple and effective. Common uses include performance fuel rails, water or fuel pumps and fuel tank modules.

D – OEM fuel rail to AN adapter. When using a factory fuel rail on an engine swap, you’ll likely need an adapter to go from the OE quick-connect fuel rail to an AN fitting.


Vintage Air

EZ AC Hoses

One thing that slows a lot of people down when installing an A/C system is when it comes to crimping the hose fittings in place. In most cases, special dies are required to crimp the lines in place to seal in the refrigerant and high pressures. Vintage Air developed a connection and crimp design that not only seals the hose and fitting, but also made it so you can build custom hoses in your garage.

The E-Z Clip refrigerant hoses are 30-percent smaller in outside diameter than traditional rubber hoses and feature an extremely durable textured finish. The nickel-plated steel O-ring fittings incorporate stainless steel cages and clips that effectively crimp in place with a simple hand tool. This combination delivers a positive, leak-free seal that can even be completed inside the car or under, or even after the hoses have been routed through the firewall or core support. The E-Z Clips will keep the cool in!



AN Prep Kit

When it comes down to securing high-pressure hoses, AN fittings are a solid choice. There is a bit more to assembling an AN fitting and it may take a couple practice runs to get it right, but once they’re done, you’ll be happy you did the extra work.

You can get away with typical hand tools to assemble AN fittings, but if you’re plumbing your whole car, do yourself a favor and invest in the tools to do the job right while making it easier. Speedway Motors offers a kit that comes with everything you’ll need including wrenches for AN -3 through -20 fittings, a heavy-duty cutting tool for crisp, clean cuts, and three assembly dies from Koul Tools to help easily assemble -4, -6 and -8 lines. Speedway also includes their reference template to match AN or NPT fittings to AN hose and specs on brake or fuel lines.


How many different fluid connectors are in this one pic? There’s a metal radiator tube with two small hoses and clamps, A/C lines that have been crimped and two hoses with shrink clamps, plus down on the bottom there are two push-lock style fittings going into the oil breather catch can.


Complete Fuel Lines

Whenever you make a fuel line system, it’s almost guaranteed that you will at some point need another fitting, which stops all progress until you run to your local speed shop. FiTech set out to solve this dilemma with their new Stainless Steel Hose Kits.

The kits are available with 20- or 40-feet of high-pressure stainless hose in natural or black finishes so you’ll have plenty to plumb a complete feed and return fuel system. Each kit is supplied with three 90-degree and 45-degree fittings along with six straight fittings (all -6AN size). They even include a 40-micron fuel filter and inline check valve to complete the job at hand! The fuel line is safe for pump gas, ethanol, or alcohol and has a chemical-resistant braid that will look good for miles to come.


Champion Cooling Systems

Filtering Coolant

Fuel filters and oil filters get all the glory and attention, but have you ever thought about a coolant filter? Debris can find a lot of hiding places in an engine block and when that crud finally breaks free, it can cause serious issues, including overheating.

Champion Cooling Systems has developed an effective filter that will protect your radiator and heater core from debris. The filters are made of an impact-resistant glass tube for easy coolant inspection at a glance along with a washable filter element. The filters are available in 1.25-, 1.5- and 1.75-inch sizes in black, chrome or gray.


Quality flares start with a quality cut. Tubing cutters are designed to deliver a clean slice that is ready for flaring.

If you’re doing a repair to a standard brake or fuel line, an economical handheld flare tool like this will suffice. This tool produces a 45-degree double flare, but if you plan on a fabricating a complete plumbing system, there are professional tools available that will save time and produce a more consistent crimp.

Koul Tools

Barbs Made Easy

If you’ve ever installed an EFI system, you’ve likely encountered the barbed fittings and heavy-duty fuel hose needed to handle the higher fuel pressure. Without a special tool, you’ll build up your biceps like Popeye before you’re done with half the fuel system. The lines and fittings work great, but they can be a chore to build. Thankfully, Koul Tools has a handy solution.

The company’s EZ-ON Hose Press, PN 409B, makes installing ¼- to 1-inch barbed fittings a breeze! The unique tool features a patented lead screw system that requires only a ratchet or small impact gun to assemble hoses quickly and safely. Simply secure the fitting in the vice side of the tool, clamp the hose in the traveling carriage, and turn the drive screw system to install the hose. No heating or uneven hose installations – and no muscle aches.


Master Power Brakes

Finding Fittings

Whether you’re repairing a single brake line or fabricating a complete brake line system, you can bet that your local parts shop is not going to have the right fittings and adapters you’ll need. Instead, you should turn to experts who live and breathe brake systems every day, like the team at Master Power Brakes.

MPB offers a handy 60-piece Deluxe Brake Fitting Kit that provides many of the normal fittings and several of the odd fittings you may need for your brake system. It’s loaded with fittings, couplers, adapters, a couple plugs, and even a couple T-fittings. You may not use them all, but it will definitely save a trip (or two) to the store. If this kit is a little overkill, they also offer a 22-piece kit ideal for front disc swaps and smaller jobs.


Sidebar – AN Assembly

AN fittings are commonly used on high pressure fuel lines but can also be used for any fluid system under the hood. They take a little more work to build, but are worth the extra effort, especially for connections you take on and off.

We stopped by Teegarden Motorsport Specialties in Rancho Cordova, California, to get some pro tips when it comes to assembling AN fittings. Their most important tip is to stick with one brand of fittings to finish your project and always use the hose recommended for the fittings.

There are two different types of AN fittings – Compression and Cutter. The Phenix Industries fitting on the left is a compression-style fitting where the hose slips over the male end of the AN fitting and the nut tightens against the hose to compress the connection. The XRP fitting on the right is a cutter-style fitting which cuts into the internal rubber hose on its beveled edge as it slips over the male end of the AN fitting before being compressed by the nut.

Just like a flare, a straight cut is key to a proper hose seal and Teegarden recommended to use a sharpened stainless hose cutoff blade. To prevent fraying on a stainless line, wrap masking tape on the cutting area. For nylon braided line, apply a little heat to tame the frays and ease the fitting installation.

Press the female part of the AN fitting onto the hose until the threads touch the hose. Apply a touch of assembly lube onto the threads of the male connection and start the threads by hand. In this example, we added a fitting to help with leverage to turn the male part of the fitting into the hose assembly.

You’ll need a couple wrenches or use a bench vise with a pair of soft jaws to secure the fitting without scratching it. Note that there can be a small gap on your assembled fitting but for style points, be sure to align the flats on each fitting.


Mr. Gasket

AN Wrenching

If you’re using a lot of AN fittings on your car, it’s best to have a complete set of AN-specific wrenches handy such as this seven-piece set from Mr. Gasket. The kit includes wrench sizes from -3 to -20 that are CNC machined from billet 6061-T6 aluminum then stamped and anodized different colors to help when selecting a tool for the job at hand.

Each wrench has contoured edges for a comfortable grip and a precise, wide surface to keep from scratching your fittings. The wrenches are also short to ease working in tight spots and to reduce the chance of over-tightening the fittings (a common mistake!). A quality set of AN wrenches should always be used rather than standard wrenches to do the job right.



Fuel Hose Upgrade

Whether you’re stepping up to an EFI system or sticking with your tried and true carburetor, it may be time to consider new fuel hose. Today’s blended fuels are absolutely brutal on older rubber hoses, especially standard old replacement lines. Earl’s Performance Plumbing offers Vapor Guard hose that is designed for high fuel pressure and to withstand the corrosive properties of modern fuels including E-85, 100-percent methanol, diesel, and bio diesel.

The Vapor Guard rubber hose is a multi-layer design with the innermost primary barrier providing resistance to heat and aggressive fuels. The middle barrier is a thermoplastic layer that provides superior fuel isolation and virtually eliminates vapors from escaping through the hose, while the exterior layer provides extreme tolerance to heat and ozone. The hose is available in 5/16- and 3/8-inch diameters in different lengths. When running a rubber hose, always use the correct clamps that grip the hose, not cut into it.


If you’re running the factory fuel rails of a late model engine, you’ll need an adapter to fit them to an AN-style fitting. This is example is available from Earl’s.


Smooth Bends

There is nothing stock about most hot rods, so when it comes to routing brake lines, fuel, or transmission lines, you’re likely going to be bending your own. The best way to keep from kinking a line is with the aid of a quality tubing bender such as the ones offered by Snap-on.

A couple different models are available, with the model shown easily working ¼-, 5/16- and 3/8-inch OD soft copper or aluminum tubing. The tool is lightweight yet very durable, with cushioned handles and an offset lever to ease making up to 180-degree bends. There are also 15-degree increments marked off to help create consistent forms. You’ll be amazed at just how handy a small tubing bender will be to have in your toolbox.


About the author Related posts

Todd Ryden

Todd Ryden is first and foremost a car guy and admits to how lucky he is to have been able to build a career out of a hobby that he enjoys so much. He’s owned muscle cars and classics, raced a bit and has cruised across the country. With over 25 years in the industry from the manufacturing and marketing side to writing books and articles, he just gets it.

A Guide to Automotive Fluid Lines, Connections, and Fittings (2024)


What is an AN type fitting? ›

AN fittings are a particular type of fitting used to connect flexible hoses and fluid-carrying metal tubing together. The name is derived from a standardized joint agreement between the Army and Navy during World War II regarding the size specification of the fitting. A-N, therefore, stands for Army-Navy.

What is a 6AN fitting? ›

Note that AN threads are different for bolts and fittings. In bolts the number refers to the diameter of the bolt whereas in a fitting it refers to the OD of the tube and thereby have different threads. For example, AN6 bolt has a 3⁄8-24 thread whereas an -6 AN fitting has a 9⁄16-18 thread.

Can you use rubber fuel line with an fittings? ›

Rubber Hose

Rubber fuel hose is easy to install. It is typically connected using standard barbed fittings and Fuel Line Hose Clamps.

What does JIC stand for? ›

JIC (or Joint Industry Council) fittings, defined by SAE J514, are compression fittings machined with a 37 degree flare seating surface and parallel threads. They are commonly manufactured in nickel alloys, brass, carbon & stainless steel. JIC Fitting hydraulic connections are common in most fluid power systems.

What's the difference between an and JIC fittings? ›

JIC fittings are dimensionally identical to AN (Army-Navy) fittings, but are produced to less exacting tolerances and are generally less costly. SAE 45-degree flare fittings are similar in appearance, but are not interchangeable, though dash sizes 2, 3, 4, 5, 8, and 10 share the same thread size.

What are the 3 hoses on a fuel pump? ›

The inline fuel filter has 3 lines all combined in the area. The supply hose is connected to the fuel filter. The return hose is connected to the top of the fuel tank. The vapor return hose is connected to the charcoal canister.

Can you use brass fittings on fuel lines? ›

It is common to find brass fittings in the air brake systems, cab controls, fuel systems, engine, transmission, cooling and air tanks on a heavy-duty truck and they meet DOT and SAE requirements. Let's take a deeper look into why brass is an ideal material for this market.

Can vinyl tubing be used for fuel line? ›

No - unless specially made for this purpose do not use plain ordinary vinyl tubing for gasoline and other hydrocarbons.

What size is JIC 8? ›

JIC 37° Flare (SAE J514)
Inch sizeDash sizeMale Thread O.D. (in)
9 more rows

Why are an fittings red and blue? ›

Traditionally, AN Fittings are produced in a red/blue color combination, which served as a nod to the origin in army and navy applications for many years.

How do you determine your fitting size? ›

As mentioned earlier, you can always identify AN fittings based on the male thread size (outside diameter). These sizes are constant regardless of brand, hose type, or fitting configuration. If your fitting has a convex 37 degree flare at the end, the threads will tell you the AN size (and vice-versa).

Are braided fuel lines better? ›

Braided Lines

Braided hose provides better heat dissipation and better flow, which is important when choosing performance car parts. Additionally, braided lines are able to withstand more pressure than rubber lines.

What is the best material for fuel lines? ›

The best fuel line material depends on your needs. However, the best material for fuel lines is polytetrafluoroethylene or PTFE. PTFE fuel line is made of plastic material specifically known as Teflon. This fuel line material is impervious is resistant to the degenerative fuel effects which could form vapor barriers.

Can you use radiator hose for fuel filler neck? ›

Most auto parts reps will try to talk you into using radiator hose for fuel tank hose. This is not something you want to do. This radiator hose will deteriorate quickly. Another option is to use metal tubing sections and elbows and use a short section of fuel filler hose to connect the tubing using hose clamps.

What is the difference between JIS and JIC? ›

Usage difference: JIS hydraulic fttings mainly used in Japanese and Korean heavy equipment such as Komatsu, Kobelco, Hitachi, Kubota etc, often used as hose adaptors. JIC hydraulic fittings mainly used in North America market, also popular in the worldwides.

What is the difference between JIC and NPT? ›

JIC fittings come with a 37O flare angle, while the NPT fittings rely on just their tapered threads for sealing. As a result, JIC fittings offer better sealing capabilities and can withstand higher working pressures.

What is an orb fitting? ›

What are ORB Fittings? ORB, or (SAE Straight Thread O-ring Boss) fittings, incorporate a port connection as recommended by the National Fire Protection Association (N.F.P.A.) for leak prevention in medium and high pressure hydraulic systems.

What is 37 degree flare used for? ›

Defined by MIL-F-18866 and SAE J514 standards, these flare fittings have been machined to have a 37° flare seating surface. These fittings are most commonly used in fluid power and fuel delivery applications, especially those using high pressure.

How do I know if my hydraulic fittings are JIC? ›

Determine the flare angle by using a calipers.

The most obvious future of JIC fittings is 37 degree flare seat. Taking the fittings along with the caliper,and put the 37° point to the flare,if you get 90°angle. Then it is a 37° JIC(SAE)fitting.

Can you use JIC fittings on an fittings? ›

JIC Steps In

The majority of the hydraulic population agrees, the JIC (or SAE) 37 degree fittings are generally interchangeable with AN fittings.

Which fuel line is the return line? ›

The vapor-return line normally runs from the fuel pump or the fuel filter to the fuel tank. This vapor-return line is connected to a special outlet in the fuel pump. Any vapor that forms in the fuel pump returns to the fuel tank through this line.

What lines or pipes connect the engine to the fuel tank? ›

The fuel line typically consists of rigid metal pipes, with flexible rubber or plastic hoses running from the pipes to the tank and the fuel pump , and from the pump to the carburettor . The flexibility of the hoses allows some movement between these different components.

Why does the fuel pump have 2 hoses? ›

There are only two hoses running from the pump. One is the high pressure line, which sends fuel to the injectors. The other is the return line, which dumps fuel that the injectors don't use back into the tank.

Should you use teflon tape on fuel line fittings? ›

To choose the appropriate thread sealant, look for its chemical resistance to fuel (diesel or gasoline) or oil running through the line. Backyard mechanics will tell you they've used regular old gas resistant teflon tape (yellow stuff) with success. This is not recommended because it risks breaking free.

Can you use teflon tape on fuel oil lines? ›

Due to its chemical inertness, PTFE tape is resistant to both petrol and oil. Therefore, it is often used in automotive applications to seal and lubricate fuel line joints.

Is copper OK for fuel line? ›

Copper tubing makes an attractive and permanent oil or fuel line and connections. Here are a few hints that might be helpful in working with copper tubing. To begin with, new copper tubing is much easier to work with than old tubing. This is because it is softer.

Can you use rubber hose for high pressure fuel line? ›

Standard rubber vacuum or heater hose should never be used in fuel applications. The hose will deteriorate from the inside out and can plug fuel filters and carburetors with rubber debris, long before it springs an external leak.

Will silicone hose hold up to gasoline? ›

The simple answer is no, standard silicone hoses are porous and therefore not suitable for oil or fuel.

Does ethanol eat fuel lines? ›

Because it is an alcohol, ethanol dries out the rubber components in a fuel system. This leads to cracking and brittle fuel lines, floats, seals and diaphragms.

Are JIC and UNF the same? ›

The only effective difference is that JIC (also known as SAE 37 degree) has a conical seating face (37 degree or 74 degree total angle) and UNF Straight has a flat seat - sealing being effected by use of a washer. Male JIC fittings have a convex cone, female fittings a concave cone.

What is #6 JIC? ›


The PD series plugs are designed for use on flared JIC fittings and will seal low-pressure requirements with light finger tightening. May be used on 37° flare fittings without gaskets.

What thread does JIC use? ›

JIC - Joint Industry Council Thread - SAE JIC 37°

Commonly referred to as just JIC fittings these metal to metal sealing type fittings have a 37° flare (sealing surface angle) and straight United National Fine straight Threads (UNF).

How tight should an fittings be? ›

Note: These torque values are a general guide that covers most fittings.
Tightening Method 1: Torque.
AN Fitting SizeAluminum FittingsSteel Fittings
3 more rows
22 Jan 2020

What is 6AN hose? ›

AN Fitting and Hose Sizes
Male Thread SizeAN Size*Hose ID**
3 more rows

What is a MS fitting? ›


An MS-type fitting replaces the need for flaring the tube and still provides a safe and dependable connection. An MS fitting is made up of a body, a sleeve and a nut. The internal design of the body causes the sleeve to crimp into the OD of the tube as the body and nut are joined.

What does SAE stand for in fittings? ›

What is SAE thread? SAE stands for the Society of Automotive Engineers. SAE fittings are mostly used in refrigeration, automotive piping systems and other low-pressure applications. It's common for copper tubes to be used with SAE threads.

How do I know what size pipe I have? ›

Measure the Outside Diameter (OD) of your pipe or pipe fitting: Wrap a string around the pipe. Mark the point where the string touches together. Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference)

How do you read an fitting? ›

The numbers used for sizing refer to the outside diameters of the tubing in 1/16” increments. So, for example, a -2 fitting is equivalent to 2/16 of an inch or 1/8”. That means, a -3 fitting equals 3/16”, a -4 equals 4/16” (i.e. 1/4”) and so on.

Can brake line be used for fuel? ›

You can use the Brake line material to run a Fuel Line, but I don't think that the 5/16" is actual Bundy Tubing.

Is clear vinyl tubing gas proof? ›

Vinyl tubing is clear, durable, and lightweight. Use flexible vinyl tubing to transport liquids, gases, and some solids. Chemically resistant to alkalies, alcohol, caliphate, hydrocarbons, oils, and some acids.

How long do nylon fuel lines last? ›

Each time the car cranks and runs, the fuel hoses will have transport the fuel to the combustion chamber. These hoses can last anywhere from 10,000 to 50,000 miles depending on what they are made of.

What are the types of fuel line connections? ›

Fuel Hose Types
  • Push-On Rubber hose. Low cost and easy to fit in place, this type of hose can be used on standard parts with no modification. ...
  • Reusable / Cutter / Compression type hose. ...
  • PFTE / Teflon type hose. ...
  • Alloy Hardline. ...
  • In Tank Hose. ...
  • Fuel Tank. ...
  • Fuel Pump. ...
  • Filter / Swirl Pot / Fuel Rail.
30 May 2019

What temp is fuel hose good for? ›

It may also be used for brake lines, clutch lines, nitrous lines, hydraulics, transmission lines, power steering and vacuum lines. It is good for temperatures from -31 degrees Fahrenheit to 482 degrees Fahrenheit.

Is vinyl tubing OK for diesel fuel? ›

Use only fuel rated hose for everything between the tank and the IP. Tygon hose is fine for return lines, and you could even get away with vinyl hose for the returns just temporarily for testing purposes.

Can you use air hose for fuel line? ›

Although hoses for water spraying, air and chemicals are made out of many different materials, those for fuel gas and kerosene are almost all made out of rubber. Can PVC and other plastic hoses be used for fuels and gas? In short, the answer is no, they cannot.

What size fuel line do I need? ›

Recommended Size, Based on Horsepower
Recommended Fuel Line Size (from the tank to the pump)
Engine OutputSize (inches)Size (AN)
350 hp or less5/16 in.-5
350-450 hp3/8 in.-6
450-650 hp1/2 in.-8
1 more row
16 Sept 2017

How do you fix braided fuel lines? ›

Steel Braided Fuel Line Repair - YouTube

What size is a an fitting? ›

AN Fittings and Hose Sizes Chart
AN SizeHose / Tube O.D.SAE Thread Size
-81/2 in.3/4 in.-16
-105/8 in.7/8 in.-14
-123/4 in.1 1/16 in.-12
-161 in.1 5/16 in.-12
9 more rows
25 Feb 2020

What are the three types of fittings? ›

Tees, Wyes and Crosses

All three designs come in standard designs (in which all outlets/inlets are the same diameter) and reducing designs (in which one or more is a different size).

What size is 6AN fitting? ›

AN Fitting Size Guide
Male Thread SizeAN Size*Hose ID**
3 more rows

What are the common types of fitting? ›

The main and most commonly sought are: elbows, tees, reducers, unions, couplings, crosses, caps, swage nipples, plugs, bushings, adapters, outlets, valves & flanges. These pipe fittings can be found in various pressure classes ranging from 150 PSI to 3000 LB.

What is the difference between a fitting & A valve? ›

Pipe fittings are components used to join pipe sections to each other or other fluid control components (e.g., pumps and valves) to construct pipelines. Pipe valves are a type of pipe fitting designed to control the flow of fluid through a pipeline.

How do I know my fitting size? ›

To find the correct fitting size, measure the outer diameter of the threads. For a male thread, measure the outer diameter (OD) of the thread. For a female thread, measure the top diameter of the opening (OD).

What size is JIC? ›

JIC 37° Flare (SAE J514)
Inch sizeDash sizeMale Thread O.D. (in)
78-141 316
9 more rows

How do you read an fitting? ›

The numbers used for sizing refer to the outside diameters of the tubing in 1/16” increments. So, for example, a -2 fitting is equivalent to 2/16 of an inch or 1/8”. That means, a -3 fitting equals 3/16”, a -4 equals 4/16” (i.e. 1/4”) and so on.

What are the types of hydraulic fittings? ›

Types of hydraulic fittings vary depending on their sizes, configuration, and thread types. The three most common types of hose fittings are O-ring, mated angle and threaded.

What are classification for pipes and fittings? ›

According to different processing methods,it is divided into four categories,namely butt welding pipe fitting(both welded and non-welded),socket welding pipe fitting,threaded pipe fitting and flanged pipe fitting.

How do I identify a pipe fitting? ›

How to measure NPT Fittings and pipe sizes - YouTube

Is hose measured by ID or OD? ›

Hoses are measured by inside diameter, unlike tubes which are measured by outside diameter. As a matter of fact, that is how the hoses and tubes are differentiated.

What are three popular sizes of tubing used on automobiles? ›

Brake tubing as used in passenger vehicle applications is most commonly 3/16”, 1/4". Infrequently you'll see 6mm diameter. Many vehicles will use a combination of 3/16” and 1/4" tubing.

What size is an16 hose? ›

AN16 200 Series Stainless Steel Braided Hose - 1m
Inside Diameter (I.D)22.2mm7/8"
Outside Diameter (O.D)30.5mm1 13/64"
Min Temperature-40 °c-40 °F
Max Temperature150 °c302 °F
8 more rows

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