Hydraulic Fittings & Adapters

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Hydraulic Fittings for industrial applications

Common Hydraulic Fittings type and applications

All types of hydraulic hose fittings are connected to tube, hose or port. A port connection is equipment such as a manifold or a pump. All types of hydraulic hose fittings are designed for industry standards, typically:

  • DIN: Deutsches Institut für Normung, German Institute for standardization
  • ISO: International Organization for Standardization
  • JIC: Joint Industry Council
  • MIL-STD: Military; Standard practice of the Ministry of Defense
  • SAE: Society of Automotive Engineers

The Most Popular Gitting Style is:

SAE J514 / J1453 37 ° Flare and 24 ° Flareless fittings

Hydraulic tube fittings made from J514 / MIL-DTL-18866 include 37 ° flare face joints and 24 ° flare-free type fittings. O-ring fittings (ORFS) meet SAE J1453 and ISO 8434-3 standards. This specification also includes adapter fittings, plugs, pipe fittings and adapter fittings. J514 fittings and adapters are typically steel for applications ranging from 1500 to 6000

These vacuum tight connection fittings are used in a wide range of hydraulic system applications such as oil and gas power applications in industry, construction, agriculture and equipment. SAE J514 fittings are also available in high pressure applications (up to 10,000 PSI) in stainless steel or other exotic alloys.

Applications may include:

37 ° flare fittings:

  • The most popular 37 ° flare fittings and available in a variety of configurations, sizes, and materials. To accommodate, the ends of the coupling tube are flared at an angle of 37 ° and the coupling nuts are tightened to fit the seat of the nozzle and sleeve. Tubes generally have a thin to medium wall thickness. The access tube consists of a pre-nut and after-flare coupling sleeve that sit on the fitting and are tightened to form a seal.

37 ° flare fittings are used in a wide range of applications in a wide range of temperatures and fluids. Primarily used for applications requiring 3000 PSI or less. However, depending on the material, size and configuration (eg straight vs straight). tees or elbows, etc.) may be suitable for operating pressures up to 7,000 PSI.

Flare fittings offer significant design and functionality compared to pipe fittings and can be used with medium wall to thin wall tubing. In most hydraulic design applications, pipe fittings have long been replaced by flare fittings, particularly in military and aerospace equipment. The most common type of connection for low and medium pressure applications is the flare fitting. The SAE 37 ° single torch is standard for most hydraulic systems. Be sure to follow SAE standards for maximum pipe wall thickness before extending the tubing to fit the connection.

Hydraulic Fittings adapters and applications

AN (Army) flare fittings:

  • As with all flare fittings, the tube is flared in preparation for installation to secure the joint. Flare tube fitting fittings consist of a sleeve and a nut. When the nuts are snug and tight, the sleeve and flare tube are tightened onto the male taper fitting to form a seal. The fitting man’s cone is at the same angle as the inside of the flare. The sleeve acts as a support to lubricate the vibrations in the flare, distributing the energy over a large area.

AN 37 ° male and female flare fittings comply with Class 3A / 3B UNJ / UNJF for greater durability, improved fatigue and longer life in aircraft and military applications. The stricter specifications of AN fittings make them ideal for industrial and commercial applications that require higher performance.

• SAE J514 24 ° non-flare compression fittings

24 ° tom type flare-less compression fittings are the second most popular fittings in
Europe after the popular 37 ° flare in the United States, but commonly referred to as EO fittings. Available in chip sizes (SAE J514) and metric (DIN 3852). Like the flare fittings, this flare-less style fitting has a metal-to-metal gasket. The fittings consist of a body, a nut and a ferrule.

This design includes a 24 ° tapered groove in the fitting body and nuts that push the ferrule into the tube when tight. When the nut tightens to the proper amount of force, the nut compresses the ferrule into a tube, giving the container a tight, non-abrasive finish. The higher the system pressure, the greater the required pipe wall thickness, so thicker walls are required for non-flare fittings where flaring is not used or possible.

Gripper type compression fittings are ideal for vacuum tight applications in harsh environments, high hydraulic fluids, high vacuum to low molecular weights. In addition, compared to 37 ° flare fittings, they can withstand a wide range of high performance due to the mechanical sealing of the backing material. Although less commonly used for end pipe fittings, 24 ° type non-flare fittings are used in some applications.

Hydraulic Fittings type and applications

MS Flare Fittings:

MS (Military Standard) flare fittings are typically used for high pressure hydraulic systems (≥ 3000 PSI) in areas where strong vibrations or friction may occur. MS type fittings do not require any flaring of the tubes and also offer safety and reliability.

Similar to standard compression fittings, MS fittings have a body, sleeve and nut. Due to the internal design of the body, the sleeve is pressed into the outside diameter of the tube when the body and nut are mixed. The fitted body has a shoulder at an angle of 15 ° to protect the tube from internal friction during tightening and to follow the seal body against the body.


Iron-to-steel gaskets on flare and non-flare fittings are the best choice for many applications, but are not as reliable as o-ring fittings in maximum tightness from the bottom of the range. . strong demand.

O-rings are very popular among manufacturers due to their connection using Buna-N (nitrile) O-rings, which typically have a hardness of 90.

• SAE J1453 O-Ring Face Seal: J1453 O-Ring Fittings have a body, nut, O-ring, and sleeve and are used to join 0.25 inch nominal diameter tubing or tubing. (6.35mm) to 1.5. inside. (38.1 hli). They are widely used in hydraulic systems and general applications where O-rings are adopted to protect equipment and equipment.

SAE J1453 also includes pipe end fittings (pipe barb) and pipe design with combination o-rings. It should be noted that, as with all design connections, these connections do not exceed the rated operating pressure at the lowest rated value.

For example, if a high operating system needs a six inch hose, it should be 2000 PSI:

  • The hose can be measured 1/2 inch at 3000 PSI.
  • Compatible pipe end fitting components can be rated at 2000 PSI. Therefore, the maximum working pressure of the assembly is the lower of the two components. That is, 2000 PSI.
Hydraulic Fittings type and using

SAE J1926-1 (ISO 11296-1) Straight O-Ring Fittings

These fittings include port fittings approved by the National Fire Protection Association (NFPA) for internal protection of medium and high pressure hydraulic systems. Male connections are direct wires with an O-ring.

The female port has a straight line and a blown face to provide a smooth, flat face and precise (minimum) position with a chamfer on which the o-ring sits. When mating male connections, the O-ring is closed when compressed with a chamfer.

The o-ring on Boss O-Ring fittings sits on the threads and screws flat and around the outside diameter of the male end of the fitting. This allows a tight seal on the female port. Primary O-ring fittings are adjustable or non-adjustable.

Adjustable o-ring boss fittings are typically adjustable elbows or tees.

Non-adjustable o-ring primary fittings are primary plugs and connectors that always fit into the port without the need for mounting.

Face Seal or Flat O-Ring (FFOR) Fittings:

All flat O-ring gaskets and connectors are considered ideal for smoke control. Male connectors have straight threads on the face and O-rings. Women have straight lines and flat faces.

Sealing is achieved by compressing the O-ring on the flat face of the female, similar to the flange separation. The threads hold the connections mechanically.

Mounting adapters are used to modify the connection of hydraulic systems

  • Hydraulic transfer from one port to another, typically connecting a pipe or tube fitting (such as a JIC to NPT thread adapter).
  • Stainless steel O-rings and flange adapters.
  • Hose end adapters to connect the hose to hose or hose to ports (the port is a female threaded hole on the product).
  • Large threaded adapters are used to reduce or increase existing threaded connections. There are many types of fittings that act as adapters, including:
  • Barbed fittings for male or female pipe, which can be straight, T, elbow, MAORB (Male Adjustable O-Ring Boss), etc.

The system should be designed taking into account the use of additional hoses, connecting rods, fittings and adapters to ensure safety, reliability and long life.

Weld Fittings

Hydraulic weld fittings (also called socket weld fittings) are connected to the pipe or other type of hydraulic fitting by an arc weld type joint around where the pipe is placed. in the ID opening and extension flange. through the body. Unlike butt weld fittings used for pipe connections up to 10 inches, weld fittings are generally used for pipes less than 2 inches.

In addition, the butt welding operation is more expensive to install than using welded material due to the lower cost and the use of a professional welder. Weld fittings are the best choice for welding small hydraulic system pipes where the resistance is high and the drain capacity is low.

Commonly used solder fittings include:

  • All ASME piping applications
  • Hydraulic piping systems are permanently required
  • Hydraulic system lines carry toxic, flammable, or sensitive materials, which can prevent leaks.
  • Steam line up to 600 PSI

The importance of choosing the right type of hydraulic fitting cannot be overstated. If the pipe can be controlled for height, the weak link in the system is connected. The right fittings should be selected so that the straightness of the line reaches the capacity.

Otherwise, hydraulic lines can cause a gradual decrease in power or serious damage to the system. It is also important to note that not all fittings, hoses, and other accessories need to be compatible or universal.

Relationships with different products from different companies are always present and generally secure if prices are competitive, but may vary by design or specification. Therefore, each part of the system must be carefully selected to ensure tightness and integrity of the system.