Hydraulic tube connectors DIN 2353
Material
DIN 2353 pipe fittings are supplied in two material versions::
- carbon steel (zinc-plated or phosphate-coated) standard seal: NBR rubber,
- stainless steel (AISI 316) standard seal: Viton
Working temperature
Allowable working temp. depends on the material of a connector and seal:
| from -40°C up to +120°C |
| from -35°C up to +100°C |
| from -35°C up to +100°C |
| from -20°C up to +200°C |
Working Pressure
The max. working pressure (nominal pressure) of DIN 2353 pipe fittings differs according to the type (light series, heavy series), size (pipe outside diameter), material and manufacturer. In the table below, data from different producers showing different types of fittings, made of carbon and stainless steel, is collected. It facilitates preliminary selection. If the required working pressure exceeds the value in the table, please contact TUBES INTERNATIONAL® Technical Department..
| series | pipe O.D.[mm] | maximum working pressure [bar] | ||
| for connection with cutting ring according to PN-ISO 8434-1 | for complete fitting according to different producers | |||
| minimum | maximum | |||
| LL | 4 ÷ 8 | 100 | – | – |
| L | 6 ÷ 15 | 250 | 160 | 400 |
| 18 ÷ 22 | 160 | 100 | 315 | |
| 28 ÷ 42 | 100 | 100 | 250 | |
| S | 6 ÷ 12 (14) | 630 | 400 | 630 |
| 16 ÷ 25 | 400 | 250 | 400 | |
| 30 ÷ 38 | 250 | 250 | 315 | |
Nominal pressure (max working pressure) given by manufacturers is calculated within static working conditions, the safety factor of 4 for the cutting ring connection. For fittings with metal to metal seal and BANJO fittings, the safety factor varies from 1.5 to 2.5. When choosing a fitting, dynamic pressure load and vibrations in the installation should be also considered.
For temperatures above +100°C, the max. working pressure may require reduction (contact TUBES INTERNATIONAL® Technical Department).
Medium:
Pipe fittings according to DIN 2353 can be used to transfer a wide range of fluids and gases. However, the compatibility of the medium with fitting material and seal type must be always checked. For all applications different from standard hydraulic oils, please contact TUBES INTERNATIONAL® Technical Department.
Pipes used in installations
Pipes used for the construction of installations:
- seamless steel precision pipes, protected against corrosion (phosphate-coated, zinc-plated), annealed,
- stainless steel precision pipes, cold-drawn, free of annealing scale, heat treated (annealed).
Pipe dimensions (outside diameter, wall thickness) should be chosen according to the required flow rate and working pressure in an installation.
 |  |
| before assembly | after assembly |
The fittings manufactured according to DIN 2353, depending on their usage and pressure, can be divided into the
following categories:
- LL (extra light series) – used in small hydraulic and cooling devices, for plastic hoses, compressed air, propane,
etc. - L (light series) – used for standard applications within the working pressure of that range.
- S (heavy series) – used for higher pressure, hydraulic high pressure applications such as: hammering, shipbuilding, mining, chemical industry, heavy equipment.
| Comparative test in a salt spray chamber after 720 hours. | |
 |  |
| standard zinc coating | VOSS Coat zinc-nickel coating |
Optimised construction of DIN 2353 connections
All components of VOSS connection system are perfectly matched to each other. Thus, it takes less effort to assemble the elements and they do not wear so much. Main advantages:
- reduction of a final assembly angle from 90° to 30°
- significantly less effort
- easy final assembly in limited space
- protection against excessive tightening during final assembly
- suitable for repeated assembly
An assortment of hand tools and fully automatic machines has been developed for mounting DIN 2353 VOSS connection components. To select the correct solution, please contact Tubes International.
VOSS RingM cutting ring connectionsM
VOSS RingM cutting ring allows an easy, quick and reliable connection. Improved cutting geometry ensures superb tightness. Construction reinforced in all areas exposed to high pressure impact increases stability and pressure resistance. Patented limit stop enables correct pre-assembly , prevents over-tightening or under-tightening of a connector. Cutting ring, with a very thin, yet extremely hard surface obtained via the process of surface hardening, can be used for stainless steel tubes. VOSS RingM rings are coated with black VOSS Coat as standard.
Characteristics:
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ES-4 cutting ring connections
A cutting ring with a moulded seal in a recess on the cone of the ring and an additional O-ring between the ring and tube (stainless steel rings have labyrinth metal seals). The seals stop all possible leaks that may sometimes occur when the metallic seal created by the ring loosens, e.g. during continuous full load operation or operation under dynamic loads. The rings are available in both carbon steel (coated with VOSS Coat, NBR sealing) and stainless steel (with FPM/FKM sealing).
Characteristics:
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Formed end connection – VOSSFormSQR
VOSSFormSQR formed end connection is a tube end formed into a shoulder matching DIN 2353 type fittings. To obtain this uniquely shaped shoulder on the tube, a section of tube material is formed with a specially designed VOSS machine (available in Tubes International). This formed tube end has and additional elastomer seal (FPM/FKM is a standard seal material).
VOSSFormSQR connection combines the highest level of safety with exceptional quality. It withstands the most extreme dynamic loads, bending and temperature fluctuations, ensuring durable and reliable connection.
VOSSFormSQR system is available in carbon steel and stainless steel.
Characteristics:
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BV-10 flared coupling connections
A system is suitable for operation under extreme loads. Resists bending moments, pressure variations, continuous maximum working pressure operation, vibrations and temperature fluctuations. BV-10 stub pipe is mounted in a tube end by pushing it in with VOSS manual device. The serrated surface of the stub pipe on the tube side prevents it from slipping out and acts as a metallic seal. The flared end of the tube is held in place by a clamping ring located in the nut.
Characteristics:
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DIN2353 Eaton Walterscheid™ connectors are designed for the most challenging applications of pipes connected
and sealed on a 24°cone. Eaton Walterscheid™ system ensures tightness of the connection up to 800 bar (for
heavy series) and 500 bar (for light series)
DIN2353 Eaton Walterscheid™ connectors made of carbon steel are plated with nickel-free, Guardian Seal™, cover to provide exceptional resistance to corrosion. The corrosion resistance of Guardian Seal™ cover exceeds the German VDMA24576 K5 standard (min. 720 hours in a salt spray chamber until red corrosion appears), qualifying the connectors for operation in the most demanding and stringent conditions. Guardian Seal™ is relatively more environment friendly. The cover is free of nickel and solvents. It meets global requirements of such European directives as RoHS (Restriction of Hazardous Substances), ELV (End-of-Life Vehicle) and REACH (Regulation for Registration, Evaluation, Authorization and
Restriction for Chemicals).
DIN2353 Eaton Walterscheid™ connector covered with corrosion resistant Guardian Seal™ is a popular solution in marine and offshore industry, for heavy duty application in agriculture, mining, railway and construction.
Three options of Eaton Walterscheid™ system are available depending on the conditions of operation:
WalPro – static operation
A nut with a cutting ring. The profiled construction of the ring ensures optimal cut penetration and a clamp evenly distributed all around the pipe diameter. Sealing is achieved when the ring is pressed against 24° cone in a nut body during tightening. Available in stainless steel also. A complete system with a cutting ring and a nut is available only as a set marked with a code HDW-MWP…
WalRing – installation prone to vibration
A nut with a two-edge cutting ring integrated with a hardened, rubberized support ring with a special, elastomer (Viton) WALFORMplus seal. The support ring guarantees that the cutting ring properly penetrates a pipe. Reliable sealing is obtained when an elastomer seal is pressed between the pipe and the ring against 24° cone in a nut body during tightening. A complete WalRing system with rings, a seal and a nut is available only as a set marked with a code HDW-MWR…
WALFORMplus – guarantees tightness even in highly dynamic operation conditions, pressure pulsation and mechanical loads
A nut with an elastomer (Viton) seal. For the system to work, the end of the pipe must be reshaped in a special machine intended for this purpose (available at TUBES INTERNATIONAL®). A shoulder formed on the pipe with the machine and the elastomer seal do not require any additional elements such as rings to make tight connection. Reliable sealing is obtained when an elastomer seal is pressed between the shoulder on the pipe and 24° cone in a nut body during tightening. The elements of WALFORMplus system (a seal and a nut) are available only as a set marked with a code HDW-MWF…
Type of material:
DIN 2353 tube connectors; in AISI 316 stainless steel
DIN 2353 tube connectors; in carbon steel (zinc-plated or phosphated)
DIN 2353 tube connectors; with zinc-nickel coating
List of products:
Rings and nuts
Straight connectors
Angled connectors
Shape connectors
Screw-in straight connectors
Screw-in angled connectors
Screw-in T-connectors
Screw-on connectors
Blank plugs and caps
If you need help choosing a product or haven’t found the right one?
Additional information:
Video: Assembly of carbon steel DIN2353 cutting rings
See how to do it!
Video: Manual assembly of carbon steel DIN2353 cutting rings
See the video!