Hydraulic connector types

Hydraulic connector types DEFAULT

Types of Hydraulic Fittings



Hydraulic fittings are components used in hydraulic systems to connect hoses, pipes, and tubes. In general, hydraulic equipment works under high pressure and is often not a fixed system. Therefore, to function safely and efficiently in their corresponding applications, hydraulic fittings must be durable, versatile, and reliable. Typically, these fittings comply with strict standards that dictate appropriate design, size, and pressure ratings.

Fittings Material

Adequate strength and corrosion resistance are the vital material characteristics of hydraulic fittings. These are crucial for handling the high pressures of hydraulic systems securely and for resisting rust and corrosion from the vessel's hydraulic fluid. Other variables involved in the choice of materials include costs and circumstances outside the environment. Material decisions include various plastic or metal types.

In most hydraulic systems, metals are used more frequently than plastics because the high pressures require higher resistance materials.

  • Aluminum
  • Brass
  • Cast Iron
  • Steel
  • Stainless Steel
  • Polypropylene
  • Polysulfone

Fitting Features

Hydraulic fittings can integrate many characteristics that provide the required additional functions for specific applications. 

  • Expansion joints and couplings connect pipe segments and allow movement due to service load, shock, or heat cycles.
  • Connect-under-pressure fittings - are designed to enable the fitting to be installed or connected while the system is under pressure.
  • Pre-insulated fittings - consist of insulating products or building jackets intended to isolate the vessel and media from outside temperatures.
  • Flexible fittings are capable of moving without damage.
  • Swivel - function makes it possible to rotate or swivel one or more suitable ends.
  • Lined fittings - are produced with an integral lining. The linings are made of polymers which are designed for use with process material or in food processing application where cleanliness of the media is crucial.
  • Bulkhead fittings are intended to be installed on either side of a barrier in a wall or bulkhead to permit pipe connections.

Types of Hydraulic Fittings

To connect tubes, pipes, hoses, valves, and other elements, almost every hydraulic system needs the use of fittings. Within the hydraulic system, these fittings seal fluid using either all-metal fittings that use metal-to-metal contact or compressed seal O-ring fittings. This way, all tube, valve, and hose fittings operate.

Compression fittings - include all kinds of fittings to connect the vessel to the fitting using compressive force.

  • Standard compression fittings - use metal gaskets, rings, or ferrules that form a compression seal on the vessel. Typically, compression is done by pressing a nut over the piping and ferrule onto the fitting, compressing and securing the inside vessel. No tools are required to assemble standard compression fittings, making them convenient for fast field facilities.
  • Bite-type fittings are compressive fittings with a sharp ferrule which, when compressed, "bites" the vessel and provides the seal. Bite-type fittings, such as conventional compressive fittings, do not involve unique assembly instruments but provide a stronger, higher pressure connection.
  • Flare fittings are made up of a flared or coned ended body. Special flaring tools are utilized for installation of the vessel inside the flare with a deep seal. Flare fittings than standard compression fittings can handle higher pressure and a more extensive range of operating parameters.  
  • Crimp fittings involve placing the hose on a tubular end and crimping a sleeve, ring or crimp socket against it. Typically, these fittings require crimping instruments or machines to connect.
  • End fittings provide specific surfaces in pneumatic systems for connecting vessels.  
  • Clamp Ends are fittings that enable the clamping of hoses or pipes on the portion.
  • Plain Ends are surface fittings that will allow adhesive, soldering, welding, or other continuous means to connect pipes or tubes.
  • Push-to-connect fittings have ends built by pressing it to the end to accept tubing. Usually, these fittings disconnect through some a retraction collar. For system segments that require frequent disconnection and reconnection, these connections are convenient.
  • Threaded fittings on their internal (female) or outer (male) surfaces have screw threads (built-in grooves) intended to accept connections with corresponding threads. Threads are called straight threads that provide an easy connection but no guaranteed seal. Tapered threads are designed to give a tight seal required for pneumatic applications. These precise threads generate a "dry fit," which means they seal without the need for additional sealant, which is essential in an application where added sealant may result in contamination or corrosion.


This article presented an understanding of the Types of Hydraulic Fittings. For more information on related products, consult our other guides or visit the Thomas Supplier Discovery Platform to locate potential sources of supply or view details on specific products.

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News & Events

If you’re new to the world of hydraulics, it can seem difficult to gain an understanding of the many hydraulic connectors available today.

In this series of articles, you’ll learn about the different types of hydraulic connectors and their key differences, which will assist in making some sense of this complex subject.

Factors affecting development of hydraulic connectors

Two factors have influenced the development of hydraulic connectors:

1: A reluctance to adopt industrial standards between countries
Many of these connector types were developed during the 20th century; a time of fierce industrial competition.

Co-operation between the major industrialised countries was limited for many years due to conflict.

2: The evolution of hydraulic systems
Hydraulic systems have changed a great deal in a short period of time.

Driving this change is the gradual increase of the desired machine output force, which is seen as a pressure increase.

In the previous series of articles introducing the three types of hydraulic connectors we discussed three principle types of connectors:

  1. Tapered threads
  2. Metal seal connectors
  3. Soft seal connectors

Each major industrial region has developed threads and connectors which fall into these categories.

How a thread is defined

There are three main elements that define a thread.

  1. The thread angle
  2. The thread pitch
  3. The thread size, or outside diameter

Other dimensions such as the depth of the thread and the minor diameter are calculated from the above sizes.

The following sections describe some basic fundamentals of threads.

Standards are used in engineering to ensure that parts from two manufacturers will fit together.

Most threads are made to a standard, and have set engineering dimensions.


The thread angle of a BSPP thread is 55 degrees.

Different threads have different thread angles.

For example NPT is 60 degrees.

Thread Anatomy Angle


The pitch of a thread is the length between two crests or two roots.

A ⅜” BSPP thread has a pitch of 19 threads per inch (TPI).

1” divided by 19 is 0.0526”.

Thread Anatomy Pitch

Outside Diameter

The outside diameter of a thread is nominated in the standard.

BSPP is a NOMINAL thread size.

(The diameter is the not the size as stated, but instead, suits the walls of a pipe of that bore size.)

Thread Anatomy Outside Diameter


The depth of a thread is based on a ratio of the pitch. (d = 0.61 x P).

In this case: 0.61 x 0.526 = 0.032”

Thread Anatomy Depth

Minor Diameter

The minor diameter of a thread is calculated as follows:
md = OD – (2 x depth)
md = 0.64” – (2 x 0.032”)
md = 0.64” – 0.064”
md = 0.576”

Thread Anatomy Minor Diameter

Tapered Pipe Threads

Tapered pipe threads have an outside diameter that is cut on a cone, and the sides are not parallel.

Tapered pipe thread types include BSPT, NPT, UNS, JIS, Metric Taper and NPTF.

Metal Seal Connectors

Metal seal hydraulic connectors use a profiled seat to form a seal.

Common types of metal seal connectors include JIC, DIN, BSPP, BSPP Flat Face, JIS, NSPM, 30 Degree Flare, Komatsu, Metric French GAZ, Metric French Millimetric and SAE (Automotive).

Soft Seal Connectors

Soft seal connectors use an elastomeric soft seal to ensure a leak-free joint, and may use O-rings, encapsulated seals and bonded washers.

Soft seal connector types include BSPP, UNO, DIN, ORFS, RYCOLOK, SAE Pilot O-Ring and SAE Flange.


The available hydraulic connectors can be defined by two sub groups: country of origin and sealing method.

The table below shows how each region has developed solutions for each of the sealing methods.

Thread Forms Sealing Methods by Country

For a quick introduction to hydraulic connectors check out our series on hydraulic connectors.

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Make sure you select the right hydraulic hose for your next project. Download our 15 Keys To Selecting The Right Hose guide today, or read about BSP Thread here.

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Process of Elimination When Identifying Hydraulic Hose Fittings

Identifying Hydraulic Hose Fittings - Product group of hose and fitting connections - Parker Hose Products DivisionIndustrial machines and equipment are designed and manufactured in every corner of the world. The hydraulic systems alone use countless different types of fittings and adapters with different sealing methods and thread forms. While the sealing method can often be distinguished by appearance, thread forms all seem to look the same, making it difficult and time-consuming to identify them when equipment modifications or repairs are needed. Identifying a fitting can be easily done, however, through the process of elimination after uninstalling the fitting.


First, determine the type of fitting – is it permanent or reusable?

Hydraulic hose fittings can be one of two types – permanent or reusable. Permanent or crimped hydraulic fittings are widely used in the fluid power industry because they are easier and quicker to attach than reusable fittings. Crimped fittings are also more reliable. To attach a crimped fitting, you will need crimping or swaging equipment. These fittings are squeezed onto the hose at assembly and are discarded when the hose assembly fails. 


Reusable or field attachable hydraulic hose fittings are not commonly used today since they are considered "old technology."  A reusable fitting is easily identifiable because it fits right onto a hose by using only a wrench and a vise. Reusable fittings typically cost more than crimped fittings and are more time consuming during the assembly process.

Identify fitting ends and port connections

Accurate identification of ports and connectors in a hydraulic system is necessary before the correct hose or tube assembly can be assembled and installed.


Port ConnectionsTube/Hose Connections

Metric Taper
SAE Straight Thread
ISO 6149
DIN Metric
4-Bolt Flange


37⁰ Flare
30⁰ Flare (Metric)
45⁰ Flare
24⁰ Flareless (SAE)
24⁰ Flareless (DIN)
30⁰ Flare (BSPP)
O-Ring Face Seal (ORFS)
60⁰ NPSM Swivel
60⁰ Cone (BSPP)
60⁰ Cone (Metric)

Next, identify the sealing method

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. However, there are several more types of hydraulic hose fittings available.


Identifying Hydraulic Hose Fittings - Parker Hose Products Division - O-Ring SealsO-Ring: The three types of O-ring seal designs are O-ring boss, flat face O-ring seal and O-ring flange. With these types of couplings, there is an O-ring seal that is the main component in creating the seal.




Identifying Hydraulic Hose Fittings - Parker Hose Products Division - Mated Angle SealsMated Angle: An example of a mated angle is SAE 45° or JIC 37° but there are others as well. Fittings with an angle seat have straight or parallel threads for sealing. When the male and female counterparts are threaded together, the threads themselves do not actually form the seal. Instead, they function mechanically to bring the two mating angle seats together which ultimately forms the seal.


Tapered Threads: These types of fittings have two types of threads: male or female. Male fittings feature their threads on the outside and female fittings have threads on the inside. Identifying Hydraulic Hose Fittings - Parker Hose Products Division - Tapered ThreadsWhen the male and female counterparts are threaded together, the tapered threads deform which applies pressure on the couplings ultimately making a tight seal. Tapered threads can be imprecise but never use tape to ensure the seal. Tape is often banned in hydraulic and pneumatic systems because of its tendency to shred and contaminate sensitive areas. Its lubricity has also been known to induce over-torquing. 

Then, look at the fitting design

After you have determined the sealing method, visually look at the location of the O-ring, nose seat, seat angle and fitting termination. You can visually see the O-ring location as well as the type of nose seat. However, you will need to use a seat gauge to determine seat angle.  


Mated Angle Seat with O-ring:

O-Ring LocationNose SeatSeat AngleFitting Termination
InsideInverted60⁰ InclusiveBritish Standard Pipe Parallel
InsideInverted24⁰ InclusiveDIN 24⁰ Cone


O-Ring Face Seal:

O-Ring LocationNose SeatSeat AngleFitting Termination
In Flange GrooveFlat FaceN/ASAE O-Ring Flange (Code 61 or 62)
OutsideFlat FaceN/ASAE O-Ring Boss
At Nose SeatFlat FaceN/AO-Ring Face Seal


Mechanical Joint or Mated Angle:

O-Ring LocationNose SeatSeat AngleFitting Termination
NoneStandard37⁰JIC 37⁰ Flare
NoneStandard45⁰JIC / SAE 45⁰ Flare
NoneStandard30⁰Japanese Industrial Standard & Komatsu
NoneInvertedN/AMetric Stand Pipe
NoneInverted30⁰National Pipe Straight
NoneInverted45⁰SAE Inverted Flare
NoneInverted24⁰InclusiveFrench Gaz 24⁰ Cone
None, except -20Standard24⁰InclusiveFrench Gaz 24⁰ High-Pressure Flange


Thread Interface:

O-Ring LocationNose SeatSeat AngleFitting Termination
N/AN/AN/ANational Pipe Tapered
N/AN/AN/ABritish Standard Pipe Tapered


Identifying Hydraulic Hose Fittings - Parker Hose Products Division - Visual Fitting Index


Lastly, measure the thread

With the caliper, measure the thread diameter of the largest point (Outside Diameter (O.D.) of male threads; Inside Diameter (I.D.) of female threads). Using the thread gauge, determine the number of threads per inch. Comparison of gauge and coupling threads against a lighted background will ensure an accurate reading.
Parker’s Hose Products Division has shadow images to easily determine thread, cone and hex size. Click on these images to print out a useful guide to assist in identifying hydraulic fittings. 

Identifying Hydraulic Hose Fittings - Parker Hose Products Division - Male Pipe Thread Sizes Identifying Hydraulic Hose Fittings - Parker Hose Products Division - SAE Nut and Nipple Chart


After you have determined the hydraulic hose fitting you need to replace, Parker Hannifin is an ideal supplier of choice. Parker offers the largest selection of hydraulic hoses plus more hydraulic fitting sizes than any other manufacturer. Parker’s Hose Products Division offers steel, brass, and stainless steel fittings from 3/16" to 3". Styles include O-ring face seal, flare, male pipe, metric designs and much more. Custom tube and hose fittings are also available in various configurations including NPTF, JIC, SAE, GAZ, ISO, DIN, JIS and BSP. Many manufacturers offer fitting wall charts as well to assist in the identification process. 



Kyri McDonough, Hose Products Division, Parker HannifinArticle contributed by Kyri McDonough, marketing services manager at Hose Products Division, Parker Hannifin.





Other related topics on hydraulic hose, hose application, and selection criteria:

An Effective Way to Identify Hydraulic Fitting Orientation 
Decoding a Hydraulic Hose Layline
Five Most Important Factors You Need to Consider for Hydraulic Fittings
Hydraulic Hose 101: Fast Facts
Successful Hydraulic Hose Assembly Starts Here
Going to Extremes: A Closer Look at Hydraulic Hoses


Sours: http://blog.parker.com/process-of-elimination-when-identifying-hydraulic-hose-fittings

Basics of hydraulic hose fittings.

How to determine proper hydraulic hose fittings?  

Nowadays there are numerous types of tools and machinery that require a specific kind of sealing. Thread types also vary according to design characteristics and technical features of the equipment. Hydraulic hoses are used for the flexible connection of two fluid ports. 

Hydraulic hoses are easily installed and uninstalled if necessary. However, at first sight, thread shapes have certain similarities between each other. It complicates the process of identification of the most hydraulic hose fittings for purchase, repair works or modification of equipment. Here is a 5-step algorithm for the determination of the needed connection.

The simple 5-step procedure to identify hydraulic fittings:

Step 1: Define the fitting type

There are two fitting types: permanent (crimped) and reusable (re-usable / returnable). In most cases, the crimped type of hydraulic hose is used because the second one is considered as the old-school one. New equipment requires a permanent type of fitting that is installed with the help of the crimping tool. 

It is worth noting that the hydraulic hose fitting becomes discarded right after the assembly was damaged or something went wrong. To sum up, much more likely you will define the permanent fitting type. If you face old equipment and are doubtful of its origin, check the following signs of reusable fittings:

  1. No crimping tools are used for its installation.
  2. The returnable type of fittings is installed on the hose with the help of screwing.

Step 2: Match port connections

Fitting ends can vary. According to their connection type and the specified end, the proper hose is selected. For example, a 4-bolt flange is one of the connection types. It is suitable for both metric and BSPP (British standard pipe parallel thread) 60⁰ cone tube coupling (hose connection). 

Other possible variants of correct installations are presented in the table below:

Step 3: Identify the sealing type

To find an appropriate fitting, it is necessary to take into consideration prime technical characteristics and their physical dimensions (diameter, size, etc.). Let’s take a look at the main types of hose fittings that have sub-variants.

O-Ring seal designs:

The main purpose of the O-ring sealing technique is to provide the seal itself. Speaking about sub-sorts of O-ring couplings, it is worth mentioning the following three types:

O-ring boss

Flat face O-ring seal (Female)

O-ring flange

Mated Angle:

The sealing technique is based on two types of threads: straight and parallel. There are male and female units that form the thread itself. Here are the graphics that describes all the possible variants of the mated-angle type of threads.

 Seat AngleCoupling Termination




Tapered Threads

This technique is notable with inside-thread female items and outside-thread male ones. The graphical description of the NPT (National Pipe Tapered) and BSPT (British Standard Pipe Tapered) models are presented below:

Step 4: Detect the fitting design with the help of visual analysis

There are various combinations of actual dimensions, O-ring position, seat angle degrees, etc. All aspects should be taken into account. Note that one of the prime features is seat angle determination. This procedure can be done with the help of a seat gauge. The most common fitting terminations were performed in the tables below. Showings are brought up to the sealing type and other characteristics.

O-Ring Face Seal

We take a look at three fitting terminations with flat-faced seats. Seat angle measuring is not required as well. The most necessary factor is the O-ring location:

Mated Angle Seat with O-ring

In this case, the nose seat is inverted. Both fitting designs are notable with the inside location of the O-ring. The seat angle should be measured.

Mechanical Joint / Mated Angle

These sealing techniques do not require O-ring availability. We divided all fitting terminations according to the type of nose seats. Two tables are presented below.

For the standard nose seat

Define the seat angle degree first.

For the inverted nose seat

Define the seat angle degree first.

Thread Interface

There are two types of fitting terminations to take into account: NPT (National Pipe Tapered) and BSPT (British Standard Pipe Tapered). The visual estimation takes place. Additionally to tables and short descriptions of available fitting designs, there is a table with visual examples for more information.

Graphical Presentation

Step 5: Identify the Tread Size

You need a thread gauge to initiate the measuring. Note that thread is determined in inches. In the following pictures, both cone and hex showings are presented. Use these diagrams for an easy determination process. 

Male Pipe Thread Sizes 

Flat Nose (Cone) Sizes

Nut and Nipple Hex Sizes

Sours: https://www.magisterhyd.com/faq/basics-of-hydraulic-hose-fittings/

Connector types hydraulic

News & Events

This article is an overview of the theory of hydraulic connectors, the three main types of connectors and the two key functions that all hydraulic connectors must fulfil.

Three Main Types of Hydraulic Connectors

It provides basic information about the three main classes of hydraulic connectors:

  • Tapered Threads
  • Metal seal connectors
  • Soft seal connectors

Two Key Functions of Hydraulic Connectors

It’s important to understand that there are two functions that a hydraulic connector must fulfil:

Sometimes the holding and sealing functions are provided by the same mechanism, and sometimes by two different parts.

Hose connectors may seem very confusing because of the many different types available.

However, when looking objectively, connectors will always simply do two things. Hold, and seal under pressure.

Development of Hydraulic Connectors

Hydraulic connectors were developed in this order:

  • Tapered threads
  • Metal seal connectors
  • Soft seal connectors

Tapered Threads

Tapered pipe threads were one of the first ways to connect pipes together.

They involve cutting the pipe thread in a tapered manner, so that the diameter of the pipe changes over the length of the fitting.

Tapered Pipe Thread

These kinds of connectors require some form of sealant, either a tape sealant, which can block the pipes, or a chemical sealant, which is preferred.

Tapered pipe threads can also be difficult to orient correctly, leading to poor sealing and leakage.

Tapered threads can also cause damage to other components, including deformation of aluminium and cracking of cast iron, due to the pressure of the steel pipe thread within the component.

They also can’t be connected to hydraulic tubes without soldering or welding of the tube to the part.

Metal Seal Connectors

Metal seal connectors were developed to address some of the limitations of the tapered pipe threads.


A metal seal connector is basically a tapered pipe thread with the addition of a 30 degree machined face, to form a seal.

This feature is generally only in hydraulic systems, because of the high pressures that need to be dealt with.

The addition of the “chamfer” on the face of the thread split the holding and sealing features of the connector.

The thread does the holding and the machined face does the sealing.

This modification also makes the connector easier to orient, better sealing, and eliminates the need for a sealant.

However, metal seal connectors still can’t accept hydraulic tube unless the tube is soldered or welded to it, and they can also have issues with vibration.

The JIC connector is a further development. It has a 37º metal seal and can accept hydraulic hose and tube. BSP Thread, BSPT, BSPP and NPT are common types of threads used in metal seal connectors.

Soft Seal Connectors

Soft seal connectors are the most recent development in the evolution of hydraulic connectors.

They make use of an elastomeric seal – natural or synthetic – to prevent leakage.

Soft Seal Hydraulic Connector

The soft seal also helps connectors resist the effects of vibration, as well as the high-pressures used in many hydraulic systems today.

The seal in a soft seal connector usually takes the form of an O-ring.

Another advantage of soft seal connectors is their rapid assembly, which can be important in high-volume production environments.

The main limitation of soft seal connectors comes from the fact that performance of the o-ring can be affected by temperature and the system fluids, if they’re not compatible with the elastic substance.

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Intro to hydraulic fitting

How to Identify the Correct Hydraulic Hose Fittings

Sapphire Hydraulics | July 14, 2020How To Identify The Hydraulic Hose Fitting You Need

When you have a worn hydraulic hose fitting, you’ll have to identify exactly which type you have so you know what to order from your supplier. If you’ve written all these connectors down somewhere, you’ll be ahead of the game, and won’t have any difficulty. If you aren’t really sure what type of connector you need, you’ll just have to determine it the old-fashioned way, and that involves some observation and some measuring.

Why are There so Many Different Types of Hydraulic Fittings?

While there might be hundreds if not thousands of hydraulic fittings and connectors, they all boil down to three basic types. These three types are either metal seal, soft seal, or tapered thread connectors. No matter which of these types of fittings yours belongs to, it will be required to satisfy two conditions: it must seal and it must hold.

In some cases, the same mechanism can fulfill both functions, and in other cases, two different parts of the same mechanism will handle the necessary functions. Tapered pipe connectors are cut on a taper with a pipe’s diameter, and it changes along the entire threaded portion of a pipe, in order to make the connection tighter. These types of fittings require a sealer, so you can be sure there will be no leakage around the fitting, and this is usually accomplished with a chemical sealant or a tape sealant.

While it might be difficult to orient the tapered pipe threads correctly, it’s very important to do so, because a poor seal might result in leakage when pressure is applied. If there is a disadvantage to tapered pipe connections, it’s that they must be either soldered or welded to tubes when making a connection.

Metal seal connectors were invented largely to provide an alternative to tapered pipe thread varieties. This type uses a tapered thread combined with a machined face, to provide a seal capable of handling the typical high pressure associated with hydraulics. The thread helps to accomplish the holding power, while the sealing is managed by the machined face.

These kinds are easier to orient than a tapered connector, and they generally provide a better seal, without the need for any kind of additional sealant. However, they do still require welding or soldering to the tube. Soft seal are probably the most popular type used today, and these have an elastomeric seal that prevents leakage even under high-pressure situations.

One of the big advantages to using soft seal connectors is that they can be installed very quickly, and this is highly advantageous in industrial applications. They are also capable of resisting heavy vibrations which many systems are subject to, so they don’t break down nearly as frequently.

How To Identify The Hydraulic Hose Fitting You Need

What are the Most Common Fitting Types?

The most common types of fittings are listed below, along with a brief description of each:

  • NPT/NPTF – the most commonly used type of thread in North America, these are recognizable by the tapered inner diameter and the tapered outer diameter, making the fitting self-sealing.
  • BSPT (JIS-PT) – commonly known as the British Thread Type, these are standard fittings which have been internationally adopted for sealing pipe ends and making connections.
  • Metric Taper – the most commonly used thread type in Europe, it is well known for its precise cylindrical inner and outer diameters.
  • SAE Straight Thread – a very reliable and reusable thread type, these have excellent sealing because of the 90-durometer O-Rings.
  • ISO 6149 – has a metric straight thread O-Ring port, which is very useful for diagnostic port applications.
  • JIS-B2351 – largely used as hose adapters for equipment designed in Japan or Korea, these usually have BSP threads
  • DIN Metric – DIN is the German Industrial Standard, and these are popular throughout Germany and much of Europe
  • BSPP (JIS-PF) – JIS stands for Japanese Industrial Standards, and these BSPP connectors follow the standard British thread dimensions
  • 4-Bolt Flange – there are a number of different types of 4-bolt flange options, either for normal duty or heavy duty

What are the Most Common Hydraulic Connections?

Given the fact that industrial equipment and machines are designed and produced by manufacturers all over the world, it’s not surprising that there are countless different types of fittings and adapters. This enormous array of fittings makes use of a number of different sealing methods and thread forms, and while many of these would appear to look the same or at least very similar, it’s not that difficult to accurately identify exactly which type it really is. The most common types of fittings are shown below, and these may be used in particular countries of the world, or by manufacturers everywhere on an individual continent.

  • 37 degree flare
  • 30 degree flare (metric)
  • 45 degree flare
  • 24 degree flareless (SAE)
  • 24 degree flareless (DIN)
  • 30 degree flare (BSPP)
  • O-Ring Face Seal (ORFS)
  • 60 degree NPSM Swivel
  • 60 degree Cone (BSPP)
  • 60 degree Cone (Metric)

To determine the type you’re actually working with, there’s a simple four-step process involved. First of all, you need to figure out whether it’s a permanent or reusable type, and the permanent fittings will be those which are crimped. These are easier and quicker to attach than reusable fittings are, and that makes them ideal for applications in the fluid power industry.

Next you need to identify the port connections before you attempt to install a hose or tube assembly, and those port connections are the ones listed above. Then you need to identify the particular sealing method, and this will generally be an automated angle, tapered threads, or an O-ring. After having determined the sealing method, you have to use a seat gauge in order to determine the seat angle.

The last thing you need to do is measure the thread, and this will call for the use of calipers. By determining the number of threads per inch on both the outside diameter and the inside diameter, you’ll be able to get an accurate reading of the thread size. Now that you know exactly which kind you’re working with, it will be fairly easy for you to call a supplier and order that precise connector.

How To Identify The Hydraulic Hose Fitting You Need High Quality Fittings And Connections

High-Quality Fittings and Connections From Sapphire Hydraulics

If you’re still not sure of which kind of fittings and connections you need for your equipment, we can help you. Contact us at Sapphire Hydraulics so we can provide you with the precise fitting for your needs. Keep us in mind for any customized equipment you might need to have designed and manufactured, as well as whenever you might need repairs to your hydraulic hoses or hydraulic cylinders.

Sours: https://sapphirehydraulics.com/how-to-identify-the-hydraulic-hose-fitting-you-need/

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