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Rod seals for hydraulic cylinders

The design of a rod or also piston rod seal is crucial for the function of the entire assembly. A rod seal is internally sealing and is usually knotted into a closed groove. Some profiles require a split installation groove. A number of profiles are offered on the market – we will assist you in making the perfect choice.

Standard profiles

The standard profiles shown below are seals that represent the state of the art. We manufacture these standard seals in-house or supply them as moulded parts from approved partners for all required groove dimensions in a variety of materials. Even inch and intermediate dimensions, but also diameters up to 3000 mm can be realized.

Depending on the quantity, the material and your requirements, we will offer you seals in the appropriate manufacturing process – everything from one source!

A general overview and more information about it are also listed in the following categories:

U-Cups and chevron set
Rod seals with leader elements made of elastomer

Choosing the correct profile

The more information is known, the better a sealing system can be adapted to a specific application.

To choose the right profile and the optimal material, the following criteria are important:

installation space
double or single-acting
pressure range
temperature range
medium
lifting speed
counter surface
installation option
friction behaviour
stick-slip behaviour
tightness
service life expectancy
price
availability

Rod seals – U-Cups and chevron set

Application U-cups

high tightness
for all hydraulic and pneumatic applications
single-acting sealing profile
assembly in closed grooves possible
many dimensions available as molded parts
inch and intermediate dimensions available

Application chevron set

high tightness
single acting sealing element
available in slotted design
fields of application: Mining, presses, special machine construction
adjustable if required

Pressure range:	up to 400 bar*
Sliding speeds:	up to 0,5 m/s
Temperature range:	-55 to +220 °C (depending on material)

* Special solutions for lip seals for higher pressures up to 700 bar are possible!

rod seal
DS 101

Chevron set or asymmetric U-cup. Standard profile for a wide application up to 400 bar, -30 to 100 °C, 0.5 m/s made of PU, up to max. 200 bar made of NBR, at temperatures up to 200°C made of FPM (Viton). For special fluids please inquire.

rod seal
DS 102

rod seal
DS 102 R

as DS101 or DS102 if high preload is required in the pressureless range, for pressures up to 600 bar.

rod seal
DS 103

as DS101 or DS102 if high preload is required in the pressureless range, for pressures up to 600 bar.

rod seal
DS 104

as DS101 or DS102 if high preload is required in the pressureless range, for pressures up to 600 bar.

rod seal
DS 104 R

as DS101 or DS102 if high preload is required in the pressureless range, for pressures up to 600 bar.

rod seal
DS 105 P

Profile with round sealing edge for pneumatic insert, mostly made of NBR. For other profile requirements, please refer to pneumatic insert.

rod seal
DS 106

Symmetrical rod seal, chevron set or U-cup. Conditions of use as for DS 101, but it is essential to ensure sufficient U-cup width.

rod seal
DS 107

as DS106, but if higher preload at low pressure is required and for pressures up to 600 bar after consultation.

rod seal
DS 108

as DS106, but if higher preload at low pressure is required and for pressures up to 600 bar after consultation.

rod seal
DS 108 R

rod seal
DS 116

Please do not use for new constructions anymore.

rod seal
DS 117

as DS101 but with secondary sealing lip if higher tightness is required.

rod seal
DS 117 R

rod seal
DS 121

symmetrical robust universal profile, mostly made of PU with O-ring made of NBR. DS107 is to be preferred in case of friction problems. Operating conditions like DS101.

rod seal
DS 125

as DS117 but with higher preload at low pressure with material PU up to 600 bar.

rod seal
DS 139

proven universal seal, originally made of NBR up to 150 bar, but can also be made of PU. Many special applications, please ask our application engineering.

rod seal
DS 141

classic low-pressure seal up to 160 bar. Made of NBR also proven as pneumatic seal, if necessary also with round sealing edge.

rod seal
DS 199

rod seal
DS 205

symmetrical pneumatic seal mainly made of NBR.

rod seal
DS 216

Please do not use for new constructions anymore.

rod seal
DS 110 112

Chevron set. The support and pressure ring can be made of NBR thread, FPM thread, POM, PA or PTFE compound, depending on the dimensions, application conditions and availability.

The sealing collars are made of NBR, NBR thread, FPM, FPM thread, PU or also PTFE and PTFE compounds (DS126-128). In principle, any seal length can be produced.

If required, slotted versions are also available.

rod seal
DS 126 128

Chevron set made of PTFE, PTFE compound, PE, POM, PA, PEEK,or combinations of these materials. Up to diameter 1500mm.

Also available in slotted design.

rod seal
DS 120

Universal rod seal for working cylinders also suitable for higher pressures. Material combination mostly PU/POM.

rod seal
DS 131

Rod seals elastomer preload elements

Rod seals with leader elements made of elastomer

Application

single- and double-acting sealing elements
universal application
low friction
low stick-slip effect
high sliding speeds possible
small installation space possible
long service life
large selection of materials
inch and intermediate sizes as well as largest diameters up to 3000 mm can be realized

Pressure range:	up to 600 bar
Sliding speeds:	up to 15 m/s
Temperature range:	-55 to +280 °C (depending on material)

rod seal
DS 109

rod seal
DS 124

double-acting rod seal set. Outer ring made of PTFE compound, preload element made of NBR, FPM, EPDM or other, depending on application conditions stick slip free, up to 400 bar, -50 to 200°C depending on material selection. Rectangular preloading element for very large diameters or for wide profiles. Special dimensions also feasible with 2 preloading elements.

For higher pressures and/or larger sealing gap with support rings made of POM or PEEK on both sides.

rod seal
DS 124 R

rod seal
DS 129

single-acting rod seal set mostly made of PTFE compound with O-ring as preload element, can be used up to 400 bar, depending on O-ring material – 50 to 200 °C, stick slip free running, for higher stroke speeds up to 15 m/s, mostly in combination with secondary seal. see also DS129R and DS238, similar operating conditions.

Secondary seal in these profiles mostly made of PU. For higher pressures with back-up ring made of POM or PEEK.

rod seal
DS 129 R

Single-acting rod seal set mostly made of PTFE compound with O-ring as preload element, up to 400 bar, With back-up ring made of PEEK or POM for higher pressures or larger sealing gaps.

Depending on O-ring material – 50 to 200 °C applicable, Stick Slip free running, for higher stroke speeds, mostly in combination with secondary seal. Secondary seal in these profiles mostly made of PU.

rod seal
DS 138

For higher pressures and/or larger sealing gap with support rings made of POM or PEEK on both sides.

rod seal
DS 140

rod seal
DS 142

the sliding ring in sealing technology. Originally for O-ring installation grooves (sliding O-ring). Not an easy assembly, but still effective when there are friction, noise, or stick slip problems.

single-acting rod seal set mostly made of PTFE compound with rectangular ring as preload element, can be used up to 400 bar, depending on the material of the preload element – 50 to 200 °C, stick slip free running, for higher stroke speeds, mostly in combination with secondary seal. See also DS129 and DS129R, similar operating conditions.

Frequently asked questions about rod seals

What is the main function of a rod seal?

The rod seal reliably seals the piston or cylinder rod as it extends and retracts. This prevents any pressurized medium from escaping from the cylinder. At the same time, it maintains a thin lubricating film on the rod, which reduces wear and corrosion.

What are the advantages of a rod seal?

Rod seals offer impressive sealing performance, low friction, and abrasion-resistant materials. They secure the medium in the system, protect the piston rod, and thus extend maintenance intervals.

What is the difference between a rod seal and a piston seal?

A rod seal is mounted in the outer part of the cylinder and seals internally against the moving piston rod. A piston seal is installed on the piston or in the inner part and seals externally against the cylinder bore.

Where can I buy rod seals?

You can request rod seals from Hänssler in Mannheim using the contact form. The company offers both standard and custom dimensions, various materials, and technical advice on selection.

Rod seals for hydraulic cylinders

Rod seals – U-Cups and chevron set

Rod seals elastomer preload elements

Frequently asked questions about rod seals

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