A Guide to Identify Hydraulic Hose Fittings

A Guide to Identify Hydraulic Hose Fittings

Hydraulic hoses, pipes, tubes, and cylinders rely on fittings to work properly. Hence, the importance of using the appropriate hydraulic hose fittings is undeniable.

These fittings are of several types. They vary depending on thread types, sizes, and configurations, among other factors. All of them appear so similar, it is often difficult to spot the variations between them at first glance.

As a result, getting the right hose fittings for hydraulic hoses is not always easy for some people. Nevertheless, getting the most suitable hose fittings is easy with the correct information. Here, we cover everything you need to know about identifying hydraulic hose fittings.

How To Identify Hydraulic Hose Fittings

identify hydraulic hose fittings

Here are some quick, simple tips to follow to identify any hydraulic hose fittings:

Check the fittings ends and port connections

Different hydraulic fittings come with varying connection ports and ends. Most of the time, these connections depend on the type of hose or tube they connect to.

The table below gives a quick rundown of some hose fitting types and their connections:

Fitting TypeHose/Tube Connections
1.JIS-B235130° Flare (BSPP)
2.NPT/NPTF37° Flare
3.BSPT(JIS-PT)30° Flare(Metric)
4.DIN MetricO-Ring Face Seal (ORFS)
5.SAE Straight Thread24° Flareless(SAE)
6.Metric Taper45° Flare

Find out if it is reusable or not

Another easy way to differentiate between hydraulic hose fittings is by checking their intended use case. Some fittings are meant to work on a particular hydraulic system, while others are reusable on other hydraulic systems.

Most of the hydraulic hose fittings you’ll find are permanent hose fittings. Such fittings require a crimping tool to attach them to the hydraulic hose. Due to this, detaching them from the hose involves work.

On the other hand, reusable hose fittings only need a wrench and a vice to install. Removing them to use on other systems is relatively way easier.

hydraulic fittings

Look at the sealing method

The sealing methods of hydraulic hose fittings vary. Among the most popular are tapered threads, O-ring seals, and mated angles. It is easy to identify a hydraulic fitting by simply checking its sealing type.

For O-ring seals, it is simpler as they feature an “O” design. However, there are other O-ring seals types as well, including the O-ring boss, flat face O-ring seal and O-ring flange.

Tapered threads have male and female types. You know it is a male tapered thread hydraulic hose fitting if the threads are on the exterior. If the threads are on the interior, it is a female tapered thread hydraulic hose fitting.

For mated angle hydraulic hose fittings, identification is easy from their straight or parallel sealing threads. Note that mated angle fittings mainly depend on industry standards. Hence, the angle varies if it is an NPT, BSP, or JIC fitting, to name a few.

Examine the design

Depending on the sealing method, the design of the hose fitting differs. Based on the different seal methods, the following table shows the different designs:

Fitting TerminationO-Ring PlacementSeat AngleNose Seat
O-Ring Face Seal
1.O-Ring Face SealNose seatUnavailableFlat Face
2.SAE O-Ring BossOutsideUnavailableFlat Face
3.SAE O-Ring FlangeFlange grooveUnavailableFlat Face
Mated Angle (Seat with O-ring)
1.British Standard Pipe ParralelInside60°Inverted
2.DIN 24° ConeInside24°Inverted
Mated Angle (Mechanical Joint)
1.JIC 37 Degree FlareUnavailable37°Standard
2.SAE / JIC 45 Degree FlareUnavailable45°Standard
3.JSI & KomatsuUnavailable30°Standard
4.Metric Stand PipeUnavailableN/AInverted
5.NPSUnavailable30°Inverted
6.SAE Inverted FlareUnavailable45°Inverted
7.Inclusive French Gaz 24 Degree ConeUnavailable24°Inverted
8.French Gaz 24 Degree High-Pressure FlangeAvailable for 2024°Standard

What Are the Different Types of Hydraulic Fittings?

Aside from design and seal types, hydraulic hose fittings differ depending on manufacturing standards. In that regard, here are the most common hydraulic fittings types you’ll find in various market:

  1. NPT/NPTF Fittings: These are threaded fittings widely used in North America. They are also known as NPS and NPSC fittings. Most NPT hydraulic fittings feature tapered or straight threads.
  2. BSP/BSPT Fittings: these hydraulic hose fittings are manufactured according to British technical standards. They are not popular in the UK alone, but also in some European countries. BSP/BSPT fittings typical feature parallel or tapered threads.
  3. SAE Fittings: SAE fittings are another popular hydraulic hose fitting type in the US and North America. They are popular as reusable O-ring fittings.
  4. Metric Taper Fittings: this fitting type is unarguably the most used in Europe. The accuracy of both its inner and outside cylindrical diameters makes it easy to identify.
  5. JIS Fittings: JIS fittings are the standard in Japan, although they often come with British standard pipe threads. They are the go-to for all made-in-Japan equipment and some Korean equipment also. 
  6. DIN Metric Fittings: DIN is short for “Deutsches Institut für Normung,” so DIN metric fittings are typical with German equipment. This fitting type is majorly found across Europe.

How Do I Know if My Hydraulic Fittings Are JIC?

JIC fittings are one of the easiest to identify. These fittings feature parallel threads with a 37-degree flare seating surface. The 37-degree flare seating surface applies to both the male and female types.

Most people often confuse JIC fittings and AN fittings. In truth, it is difficult to differentiate between both by simply looking at them.

JIC fittings follow Joint industry council by SAE J514 and MIL-DTL-18866 standards. On the other hand, AN fittings follow the United States Air Force – Navy Aeronautical Design Standards.

Also, if the fitting is made of copper-nickel, titanium, or aluminum, it’s not a JIC but aAN fitting.

How Do I Know if My Hydraulic Fittings Are NPT?

If you’re in the US or nearby countries like Canada, you most likely use NPT fittings. These fittings are suitable for a number of applications.

To know if your hydraulic fittings are NPT, first consider the tapered angle. NPT threads typically feature a 1° 47′ 24” tapered angle, measured from the center axis.

Furthermore, the male and female threads of NPT fittings usually have the same 60-degree angle, flat peak and valley, and pitch. However, they come in different threads per inch and trade sizes.

How Do I Know if My Hydraulic Fittings Are BSP?

BSP hydraulic fittings are available in tapered and parallel threads. Both the tapered and parallel thread types come with a 55o flank angle.

In appearance, BSP tapered fittings are similar to NPT fittings. However, the key difference is that NPT fittings have a 60° thread flank angle. When you spot this difference, identifying a BSP tapered fittings becomes easy.

For BSP parallel thread fittings, identifying them is easy by checking the sealing method. Male threads usually have a 30° chamfer, while female threads have a 30° recessed cone.

Another unique characteristic of BSP fittings is that the male BSP tapered fittings seal with female BSP parallel fittings. However, note that this is only possible if it is a non-swivel and flexible female thread.

Get Your Premium QUALITY Hydraulic FITTINGS AND CONNECTIONS From Strongflex

Now that you know the different types of hydraulic fittings and how to identify them, you now have all you need to make your selection. When it comes to hydraulic hoses, fittings, and connections, it’s critical to stick with quality products for optimal performance.

This is why at StrongFlex, we strive to manufacture nothing but premium-quality hydraulic hoses and fittings applicable to any industry. Contact us today and get the right hydraulic fitting and connections you need.

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