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Air conditioning hose SELKLIMA DN08 35 bar

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Air conditioning hose SELKLIMA DN08 35 bar

The SELKLIMA DN08 35 bar air conditioning hose is a line designed for automotive air conditioning systems operating with R134a refrigerant in both gas and liquid phases. The DN08 size corresponds to an inner diameter of 8 mm, or 5/16". The product proves itself during the repair, reproduction, and manufacturing of air conditioning lines in passenger cars, delivery vans, trucks, buses, agricultural machinery, construction equipment, and special vehicles.

The SELKLIMA DN08 hose available in the HYDRON store has a construction designed for operation in A/C systems, rather than typical power hydraulics. The hose features an inner layer made of butyl rubber with very low permeability, one steel wire braid, and an outer layer of special synthetic rubber resistant to high temperatures. You can find the product directly as air conditioning hose SELKLIMA DN08 35 bar.

Technical parameters

Product: air conditioning hose SELKLIMA DN08 35 bar
Hose type: automotive air conditioning hose
Series: SELKLIMA-G
Nominal size: DN08
Dash size: 06
Inner diameter: 8 mm
Inch diameter: 5/16"
Outer diameter according to catalog data: 17.2 mm
HYDRON designation: DN08x17
Working pressure: 35 bar
Burst pressure: 137 bar
Minimum bending radius: 85 mm
Weight: 345 g/m
Inner layer: special butyl rubber with very low permeability
Outer layer: special synthetic rubber resistant to high temperatures, pin-pricked
Operating temperature range: from -30°C to +125°C
Working medium: R134a in gas and liquid forms
Recommended oil: PAG
Standard: SAE J 2064 TYPE B CLASS 1
Application: automotive air conditioning systems, A/C line repair, air conditioning installations for vehicles and machinery

A/C hose DN08 for R134a refrigerant

SELKLIMA DN08 is an air conditioning hose that can be used in systems requiring resistance to R134a refrigerant and PAG oil. This is important because an A/C line must minimize refrigerant permeation through the hose wall and maintain leak tightness under fluctuating temperature conditions. A regular fuel, pneumatic, or hydraulic hose is not a proper substitute for an air conditioning hose.

In the category automotive air conditioning fittings there are also other components available needed to repair A/C lines, including connectors, fittings, ferrules, and air conditioning hoses. This allows you to complete the entire set for manufacturing a line in one place.

Steel wire braid in the SELKLIMA-G hose

The SELKLIMA DN08 hose features a single steel wire braid. Such reinforcement increases the hose's pressure resistance and improves operational stability in the air conditioning system. The steel braid is especially important in hoses exposed to vibrations, temperature changes, operation in the engine compartment, and cyclic loads during A/C compressor operation.

However, the steel wire braid should not be seen as a reason to use this hose in typical power hydraulics. It is an air conditioning hose, designed for R134a refrigerant and PAG oil, not for hydraulic oil operating under the high pressures characteristic of cylinders, distributors, or hydraulic pumps.

Butyl layer and low refrigerant permeation

The most important feature of a good air conditioning hose is its low permeability. The inner layer made of butyl rubber reduces refrigerant loss through the hose structure. In practice, this affects air conditioning performance, servicing frequency, and compressor lifespan. If the hose leaks refrigerant, the system loses efficiency, and the user quickly experiences weaker cooling.

In automotive A/C installations, a leak is not always visible immediately. It often manifests only after some time: through a pressure drop, an oily fitting, the need for frequent A/C recharging, or uneven system operation. For this reason, only hoses designed specifically for this medium should be used to repair air conditioning lines.

Temperature range from -30°C to +125°C

The SELKLIMA DN08 air conditioning hose can operate in temperatures ranging from -30°C to +125°C. Such a range is significant when installing it in vehicles and machinery, where the hose may be located near the engine, compressor, condenser, dryer, or other components exposed to variable temperatures. The outer layer made of special synthetic rubber was selected precisely for these types of conditions.

During installation, however, direct contact with the exhaust manifold, sharp edges, moving belts, the fan, and places where the hose could be constantly rubbed against must be avoided. Even a high-temperature-resistant hose requires correct routing and proper mechanical protection.

Selecting fittings for the DN08 air conditioning hose

The hose itself is just one component of a finished air conditioning line. To make a leak-tight connection, appropriate fittings and crimping ferrules matching the hose's construction must be selected. With the DN08 size, both the inner and outer diameters of the hose matter, as they determine ferrule selection and crimping quality.

The components needed to assemble the line can be selected in the air conditioning hose fittingssection. When crimping, random hydraulic fittings should not be used, as the air conditioning system requires fittings resistant to refrigerants, oils, and temperature changes.

Crimping ferrules for air conditioning hoses

For proper crimping of the SELKLIMA DN08 hose, a ferrule matched to the hose's diameter and construction is required. A ferrule that is too loose will not provide a tight seal, while one that is too tight can damage the inner layer of the hose. In air conditioning, even a minor leak at the ferrule or fitting can lead to gradual refrigerant loss.

To assemble a complete hose line, it is worth checking the category crimping ferrules for air conditioning hoses. The ferrule should be selected for the specific type of hose, not just the nominal DN08 size.

Where is the SELKLIMA DN08 hose used?

The DN08 air conditioning hose is used in passenger cars, vans, coaches, trucks, agricultural machinery, excavators, loaders, municipal vehicles, and special equipment. It is useful when repairing a damaged A/C line, fabricating a new section of the installation, replacing a perished hose, or modifying the hose routing following a machine upgrade.

Most commonly, hoses of this type work between the compressor, condenser, evaporator, dryer, and expansion valve. The selection of the DN08 diameter should be based on vehicle documentation or measuring the old hose. A diameter that is too small can restrict flow, while one that is too large can hinder proper system operation.

Minimum bending radius of 85 mm

The minimum bending radius for the DN08 variant is 85 mm. This parameter must be considered when routing the hose in the engine compartment or in tight machine spaces. The hose should not be kinked, axially twisted, or forcibly pulled towards the fitting. A bending radius that is too small can restrict flow, weaken the hose layers, or accelerate its damage.

When repairing a line, it is worth reproducing the natural factory routing. If the original hose was run in clamps, brackets, or guides, similar routing should be used. Leaving the hose loose can cause chafing, vibrations, and localized overloads near the fittings.

SELKLIMA DN08 vs. thin-walled or thick-walled hoses

The range of air conditioning hoses features various designs: thin-walled, thick-walled, hoses with textile braiding, and hoses with steel wire braiding. The SELKLIMA DN08 with a steel braid should not be automatically replaced with another hose just because it has a similar inner diameter. The outer diameter, bending radius, reinforcement type, burst pressure, and required ferrule can all vary.

If a different type of A/C hose is needed, you can also compare the category Continental air conditioning hoses. These are not automatic substitutes for SELKLIMA, so when replacing, full parameters and compatibility with the fittings must be verified.

Working pressure 35 bar

The hose's working pressure is 35 bar, and the burst pressure is 137 bar. These parameters apply to the hose itself, while the finished assembly must be assessed as a complete unit: hose, ferrule, fitting, crimp quality, and the condition of the air conditioning system. An installation error at the fitting can cause a leak even if the hose itself has the correct parameters.

Before putting the system into operation, a leak test should be performed in accordance with the air conditioning service procedure. For utility vehicles, it is also worth checking whether the hose is exposed to vibrations, impacts, twisting, or bending at too sharp an angle.

Most common mistakes when selecting a DN08 air conditioning hose

The most common mistake is selecting a hose solely by its 8 mm inner diameter. In air conditioning, the outer diameter, construction type, compatibility with the ferrule and fitting, and compliance with the R134a refrigerant are just as important. The second mistake is using a hydraulic or fuel hose instead of an A/C hose. Such a substitute may look robust, but it might not have the appropriately low permeability for the refrigerant.

The third problem is bending the hose too tightly during installation. The fourth mistake is using the wrong oil or failing to check if the system operates with PAG oil. The fifth problem occurs when crimping fittings without selecting the proper ferrule. In practice, a leak often occurs not in the middle of the hose, but at a poorly executed connection between the fitting and the hose.

How to order air conditioning hose by the meter?

When ordering a hose by the meter, the required length must be specified accurately, including an allowance for proper routing, the bending radius, and fitting installation. A section that is too short will work under tension, and one that is too long may rub against vehicle components. It is safest to measure the old hose after removal or to plan the routing of the new section on the vehicle.

If the hose is to be crimped, before cutting it is worth confirming the type of fittings, the output angle, the alignment of the components relative to each other, and the working location in the system. Precise length selection is particularly important in air conditioning lines, as the finished hose often has to bypass several components in tight spaces.

Why buy an air conditioning hose at HYDRON?

HYDRON supplies hoses, fittings, ferrules, and components for repairing air conditioning systems in vehicles and machinery. When purchasing at a technical store, it is easier to select a complete set: hose, fitting, ferrule, and the appropriate installation method. This is important for air conditioning service, where a random selection of components can result in a slow loss of refrigerant and the need to dismantle the installation again.

In case of doubt, it is worth preparing a picture of the old hose, the diameter measurement, the fitting types, and information about the vehicle or machine. This makes selecting the DN08 hose, ferrules, and fittings faster and technically safer.

FAQ

What is the SELKLIMA DN08 air conditioning hose used for?

The hose is used for transferring R134a refrigerant in both gas and liquid forms in automotive air conditioning systems.

What is the diameter of the SELKLIMA DN08 hose?

The inner diameter is 8 mm, which is 5/16". The outer diameter according to catalog data is approximately 17.2 mm.

What is the working pressure of this hose?

The working pressure is 35 bar, and the burst pressure is 137 bar.

What type of braid does the SELKLIMA DN08 hose have?

The hose has a single steel wire braid.

What is the operating temperature range?

The operating temperature range is from -30°C to +125°C.

What oil is recommended for this hose?

PAG oil is recommended for this hose.

Is the SELKLIMA DN08 suitable for power hydraulics?

No. It is an automotive air conditioning hose designed for R134a refrigerant, not a standard hydraulic hose for high-pressure oil.

What to check before buying the DN08 hose?

Before purchasing, you should check the DN08 diameter, R134a refrigerant type, required PAG oil, outer diameter, fitting types, crimping ferrules, bending radius, and hose routing in the vehicle.