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cutting ring fittings 24° for lubrication systems

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elbow screw fitting 24° elbow connectors screw type / body straight screw coupling 24°
elbow screw fitting ISO 8434-1 elbow connector screw type body straight screw coupling ISO 8434-1
connector 24° straight connector type / body 24° Equal tee 24°
connector LL L stainless steel 1.4571 straight connector type body LL equal tee LL L
nonreturn valve / body 24° coupling nut DIN 3870 cutting ring 24° DIN 3861
nonreturn valve body stainless steel 1.4571 coupling nut stainless steel 1.4571 cutting ring stainless steel 1.4571
bulkhead elbow bulkhead M10x1 M6x1 bulkhead straight
bulkhead elbow L bulkhead M10x1 6L bulkhead straight L stainless steel 1.4571
nonreturn valve complete with coupling nut and cutting ring swivel union 24°  
nonreturn valve complete with coupling nut and cutting ring swivel union banjo ISO 8434-1  

Our cutting ring fittings respectively compression joints can be used for centralised grease lubrication systems and low-viscosity grease addition systems. They are generally used for lubrication system construction and industrial machinery, commercial vehicles and wheel flanges. We are specialist in manufacturing particularly small LL-series compression joints.

Please click on the respective picture for more information on the individual joints for all current lubrication systems.

In order to deliver and convey oil and grease in pipes, piping systems, plastic tubes and hose lines such as, for instance, our plastic tube PA12HL or our high-pressure hose 840 bars, cutting-ring fittings are required to combine and connect these various pipes and hoses one to another so that excellent tightness and pressure resistance thereof can be achieved.

Innovative developments are used to this end, generally known as cutting-ring fittings.
In all fields such as use of a centralised lubrication system on a building machine, agricultural machine or commercial vehicle as well as upon installation and operation of industrial plants, such as wind-power plants, beverage industry or paper industry, cutting-ring fittings are required everywhere.
A quite central application of cutting-ring fittings is the use thereof in the realisation and installation of a centralised lubrication system.
Cutting-ring fittings for normal use are offered, among others, in version made of steel 1.0718, 1.0402, carbon 20 or 45 (surface chromium-6-free galvanised each).

A cutting-ring fitting made of premium stainless steel (material grade 1.4401 and/or 1.4571) is in turn a suitable component for use in foodstuff and beverage industries as well as in the area of harbours and other wetland areas.
This is due to the fact that stainless steel is a neutral material, featuring enormous chemical resistance.

In order to maintain adequate specification, quality, and rationalisation when mounting and using the cutting-ring fittings, the production thereof is subject to quality certification pursuant to EN ISO 8434 as well as DIN-standard 2353.
A cutting-ring fitting is generally comprised of a stud with 24° taper, a union nut according to DIN 3870, and a cutting ring according to DIN 3861 form A or DIN 3861 form B.
The stud of cutting-ring fittings has got both a screw-in thread of various sizes and a male thread of hole shape W with 24° taper.
The union nut is also equipped with metric thread. These threads are available in various sizes according to style and pipe diameter.
In order to ensure the enormous sealing capacities, the cutting rings are also equipped with a taper 24°.

For ensuring the widespread use of cutting-ring fittings in lubrication technology, on centralised lubrication systems, hydraulic and pneumatic installations, three typical fitting variants are first available from standardised industrial manufacture.
There is a difference made between cutting-ring fittings of styles LL, L and S.

These various styles are classified according to their loadability with regard to pressure conditions.

Outer tube diameter
Nominal pressure / Operating pressure
in bar and psi
LL (very light) 4 - 8 100 bar / 1450 psi
L (light)

6 - 15

18 - 22

28 - 42

250 bar / 3626 psi

160 bar / 2321 psi

100 bar / 1450 psi

S (heavy)

6 - 14

16 - 25

30 - 38

630 bar / 9134 psi

400 bar / 5852 psi

250 bar / 3626 psi


In this context, the following rule must be applied to these specifications of operating pressure: the burst pressure (i.e. crack pressure) of cutting-ring fittings is far higher - as a function of style and pipe diameter, this pressure is three to four times higher than the operating pressure.


Further to the very light LL style with an operating pressure of up to a maximum of 100 bars, there is also the L style of up to 100 and/or 250 bar a the heavy S style for cutting-ring fittings of a pressure resistance of up to 250 and/or 600 bar.


Thanks to the high pressure resistance and still very small configuration of LL style, these cutting-ring fittings took hold in the field of centralised lubrication technology.


The configurations of cutting-ring fittings are distinguished by the huge number of possible connections. Further to the standard cutting-ring fittings configured as straight and 90° elbow male fittings, other models can also be installed.

Further fittings available in the product category cutting-ring fittings are such configurations designated as bulkhead fittings, sealing-cone fittings, reducing fittings, and banjo fittings. In addition, thereto, check valves are also widespreadly used.

As regards plenty of manufacturers who have adopted cutting-ring fittings in their production assortment, a difference is made between variable series. The individual series of cutting-ring fittings show variations in materials, sized and screwing variants. Cutting-ring fittings made of steel or stainless steel can be used.

A plug-in sleeve is an additional element for use of cutting-ring fittings. This is the technical precondition for the use of cutting-ring fitting on some definite tubes or pipes made of plastic material. In this context, however, the cross section of pipes and tubes becomes smaller as the reinforcing socket (plug-in sleeve) requires additional space.

In order to impart long service life, reliable performance characteristics and excellent functionality on the cutting-ring fittings made of steel, a galvanic coat of the type chromium-6-free (C6F) or zinc-nickel (ZNNI) of surfaces is applied by the manufacturer.

Cutting ring-fittings which have found their place in centralised lubrication technology will considerably ease technical and manual jobs and make them economic and efficient. The advantage of up-to-date cutting-ring fittings is that such fittings can be easily mounted.

Cutting-ring fittings can be integrated in various processes and feature the fitting solutions most commonly used. The pipe or tube is retained by the cutting ring in a pressed-in connection.


Connection of cutting-ring fittings to plastic tubes, metallic pipes and hose lines is most frequently used.


Cutting-ring fittings feature an optimal solution for the connection of various pipes and hoses. The connection is held tight by positioning and tightening of union nut and the consequently pressed cutting ring.

Within the great variety of fitting types, cutting-ring fittings rank among the highest loadable and safest technical design solutions when being incorporated in centralised lubrication systems or hydraulic installations.


Category: Products - fittings - cutting-ring fittings 24° for lubrication systems