Compression Fittings
A flareless compression fitting allows for a leak-free connection in hydraulic systems. As hydraulics systems operate under high pressure, it is absolutely necessary to secure pipes and tubes well.
As compression fittings follow the DIN2353 standard made by the Deutsches Institut für Normung, this ensures the quality of the products, as well as ability to match with other products.
Fittings are designed in 3 type of series, S, L and LL series, which are used to broadly identify the fittings, S as high pressure, L as light pressure and LL as very light pressure.
As compression fittings follow the DIN2353 standard made by the Deutsches Institut für Normung, this ensures the quality of the products, as well as ability to match with other products.
Fittings are designed in 3 type of series, S, L and LL series, which are used to broadly identify the fittings, S as high pressure, L as light pressure and LL as very light pressure.
Size |
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Material |
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Working Pressure |
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Connection Type |
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Complete set components |
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CATALOGUE :
What are Compression Fittings
1. What does compression fittings do?
Male Connector
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A compression DIN hydraulic fitting plays an important role in a system installation. With the correct fittings chosen, it makes the equipment more efficient and creates a smooth flow in the system. Of course the wrong fittings may also cause lots of equipment damage, making wear and tear happen lots more quickly whilst also risking damaging the machine. By using these high quality fittings, you are less susceptible to all of these events from happening. The well-known market brand is Parker, from United States.
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2. Are compression fittings reliable?
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The working pressure of the fittings is very high. Seeing as it is constantly put through very regular flow in the system, the fittings need to be extra strong in order to go through a lifetime. This means that they can handle working pressure up to 800 Bar. This corresponds to around 11,600 psi, or pounds per square inch. There are 3 series available, which is S, L and LL series. S series fitting is able to work pressure between 315 to 630 bars. L series fitting is able to work at 160 bar or 315 bar pressure. It is subject to outer diameter size. The lowest pressure is 100 bars, which is available for LL series only.
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Blanking Plug with Union Nut
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Series |
Working Pressure |
S |
Up to 800 bar |
L |
Up to 500 bar |
LL |
Up to 100 bar |
3. What are tube fittings made of?
Single ferrule fittings can be made out of many different materials. This allows for higher flexibility in equipment usage. The materials that are used are SS316 Stainless Steel, Carbon Steel, and Brass. All of these correspond to different types of equipment where they would work best.
The sizes of these compression fittings also range widely in order to be flexible in all situations. These fittings have a size range between 4mm being the smallest, and 42mm being the largest. The countries of origin are made in Eaton, Germany and HSME, Korea.
The sizes of these compression fittings also range widely in order to be flexible in all situations. These fittings have a size range between 4mm being the smallest, and 42mm being the largest. The countries of origin are made in Eaton, Germany and HSME, Korea.
4. When should you use a compression fitting?
Union Coupling
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There are many different configurations available for these fittings, as they need to be flexible for many different situations. Some of the more obvious fittings are for straights, where it is installed where the connection is straight up to the next pipe or hose, as well as elbows where there is a perpendicular connection between the pipe and hose. This does not mean that other types of fittings are unavailable. Other configurations such as tees, crosses, caps, plugs and nuts are available for more delicate and specific situations.
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5. Items you'll need to prepare before connection tubes and fittings
A proper preparation is essential important before production of high quality installation. 3 step material preparation below before assembly:
Step 1: Tubes: Choose your tube material wisely that suit your requirement such as working pressure, temperature range, chemical composition and etc.
Step 2: Fittings: Choose your fitting configuration in designing your flow direction such as union coupling, 90d elbow, tee and other alternative.
Step 3: Tools: Choose the tools according to tube outer diameter size to smoother the tighten process.
A proper preparation is essential important before production of high quality installation. 3 step material preparation below before assembly:
Step 1: Tubes: Choose your tube material wisely that suit your requirement such as working pressure, temperature range, chemical composition and etc.
Step 2: Fittings: Choose your fitting configuration in designing your flow direction such as union coupling, 90d elbow, tee and other alternative.
Step 3: Tools: Choose the tools according to tube outer diameter size to smoother the tighten process.
6. How to connect compression fittings to tubes?
Assembly process is important to ensure high performance fittings. Assembly and disassembly of the fittings are equally easy. Due to the robust tube grip, it is very resistant to vibration fatigue and is able to withstand high pressures as well as extreme temperatures.
By using correct assembly tool, there are 5 steps to be followed:
Step 1: Cutting ring and nut to be placed over the tube in the correct direction.
Step 2: Before hand-tighten with the nut, the tube will need to insert into the pre-assembly tool up to tube abutment.
Step 3: Tighten 1 1/4 turns beyond the hand tighten position by using a wrench.
Step 4: Take out the pre-assembly and untighten and remove the nut to check the ring formed up over the tube. The visible ring is formed up with the penetration of the cutting ring into the tube surface.
Step 5: With fitting body holding up, use a wrench to tighten the nut until a noticeable increase in torque is felt. Beyond this point tighten the nut 1/4 turn for last round of assembly.
*Important note: Do not turn the fitting body, turn the nut only*
Assembly process is important to ensure high performance fittings. Assembly and disassembly of the fittings are equally easy. Due to the robust tube grip, it is very resistant to vibration fatigue and is able to withstand high pressures as well as extreme temperatures.
By using correct assembly tool, there are 5 steps to be followed:
Step 1: Cutting ring and nut to be placed over the tube in the correct direction.
Step 2: Before hand-tighten with the nut, the tube will need to insert into the pre-assembly tool up to tube abutment.
Step 3: Tighten 1 1/4 turns beyond the hand tighten position by using a wrench.
Step 4: Take out the pre-assembly and untighten and remove the nut to check the ring formed up over the tube. The visible ring is formed up with the penetration of the cutting ring into the tube surface.
Step 5: With fitting body holding up, use a wrench to tighten the nut until a noticeable increase in torque is felt. Beyond this point tighten the nut 1/4 turn for last round of assembly.
*Important note: Do not turn the fitting body, turn the nut only*
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