catalogue o rings en

8/10/2019 Catalogue O Rings En

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O-RINGS


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32O-RINGS O-RINGS

Technical information Technical informationContent

1. INTRODUCTION

Basic characteristics 4

Materials used, their properties 4 5

Fabrication tolerance, standards 5 6

Function and use 6

Sealing joint, material hardness 7

Installation instructions 8

2. DETERMINING THE RIGHT O-RING SIZE

Determing the thickness (d2) and the inner diameter (d

1) 9

Detailed groove construction basic notions 10

3. STATIC SEALING RADIAL DIMENSION

Determing the dimensions rectangular groove 10

Tolerance, roughness, max. sealing joint 11

4. STATIC SEALING AXIAL DIMENSION


Determing the dimensions trapezoidal groove 12

Determing the dimensions triangular groove 13

5. DYNAMIC SEALING


Roughness tolerance 15

PTFE O-rings 16

O-rings for vacuum sealing 16

Cords 17

Assembly boxes for bonding of O-rings 17

Dimension series of NBR O-rings 18 50

Dimension series of FPM O-rings 51 81

X-rings 82

Range of products


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54O-RINGS O-RINGS

Technical information Technical information

1. INTRODUCTION

O-rings are highly precise circular sealing elements, which are efficient and economical at the same time and can

be used for a wide range of both static and dynamic applications. O-rings are vulcanized in moulds and, due to

their symmetric shape, they can be used as single as well as double seals. The size of an O-ring is dened by its

inner diameter d1x ring thickness d

2(gure 1). Sizes, materials, hardness and installing dimensions are dened by

the DIN 3770 or ISO 3601 standard. All dimensions are given in millimetres.

d1= inner diameter (mm)

d2= O-ring thickness (mm)

Material groups

The following table gives an overview of material groups of elastomeric substances with the option of choosing

the material hardness (table 1). The following factors inuence the decision on material and hardness: size of

sealing joint, temperature, pressure, chemical exposure.

For most applications, the

standard quality NBR 70

Sh is sufficient. For higher

temperatures and chemical

exposures, standard quality Viton

FPM 80 Sh can be used.

Material hardness is given on the

Shore or IRHD scales.

Please inquire for non-standard materials such as polyurethane, KALREZ, uorosilicone, NEOPRENE -

they can be delivered after the manufacturing plant is consulted.

OK NBR 70 35 x 3

d1 d2type material hardness

dimensions

Properties of selected materials

1 - excellent

2 - very good

3 - good

4 - applicable

5 - less applicable

6 - not applicable

X - not measured for this material type

Production tolerance of O-rings

The following values show tolerances for Nitrile-

butadiene-rubber compound with 70 Shore or

73 IRHD hardness. Even with identical moulds,

other compounds have different cross-sections

and higher tolerances. It is always possible to

manufacture special moulds according to your

specications.

O-RINGS MATERIAL (table 1)

Code Trade name Hardness Shore A

NB, NBR Nitrile-butadiene-rubber 55, 60, 70, 75, 80, 90

FP, FPM Fluorine rubber (Viton) 60, 70, 75, 80, 90

SI Silicone rubber 50, 60, 70, 80

EP, EPDM Ethylene-propylene rubber 75, 80, 85

CR Chloroprene rubber 50, 60, 70, 90

NR Natural rubber 45, 65, 80

BU Butyl rubber 45, 65, 80

CSM Chl orsulphonated polyethyl ene rubber (Hypalon) 65, 75

PTFE Polytetrauoroethylene (Teon) -

HARDNESS OF O-RINGS (table 2)

Shore A hardness 60 70 80 90

IRHD hardness 63 79 83 92

Tolerance 5Tested according to DIN 53505 or 53519

PROPERTIES OF SELECTED MATERIALS (table 3)

Material type NBR FP SI EPDM CR NR BU CSM PTFE

Tensile strength without support 5 5 6 5 3 1 4 5 1

Tensile strength with support 2 3 4 3 2 1 3 3 1

Elongation at break 2 3 4 3 2 1 2 3 3

Reverse elasticity 3 5 3 3 3 2 6 4 x

Constant resistance 2 4 5 3 2 2 3 3 3

Tensile resistance 3 3 6 3 2 2 3 4 2

Resistance to electrical ow 4 4 1 2 3 1 2 4 1

Resistance to strain ageing 3 1 1 1 2 3 2 2 1

Resistance to ozone 3 1 1 1 2 4 2 2 1

Resistance to fuel 1 1 5 5 2 6 6 2 1

Resistance to oil 1 1 1 4 2 6 6 2 1

Resistance to acid 4 1 5 1 2 3 2 2 1Resistance to alkalis 3 1 5 2 2 3 2 2 1

Resistance to hot water 3 2 5 2 3 3 1 3 1

Max. temperature (C) 130 220 200 150 120 90 140 130 260

Min. temperature (C) -40 -25 -80 -40 -30 -50 -40 -40 -190

TOLERANCE OF ORINGS (table 4)

diameter d1

toler ance () diameter d1

tolerance ()

Up to 3 0,14 Up to 1,8 0,08

3 6 0,15 1,8 2,6 0,09

6 10 0,17 2,6 3,5 0,1

10 18 0,2 3,5 5,3 0,13

18 30 0,3 5,3 7 0,15

30 50 0,4 7 8 0,1750 80 0,65 8 10 0,13

80 100 0,85 10 15 0,25

100 120 1

120 150 1,2

150 180 1,4

180 250 1,8

250 300 2,1

300 350 2,5

350 400 2,8

400 500 3,4

500 650 4,3

650 800 6,5

O-ring ordering example


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76O-RINGS O-RINGS


O-rings standards

Function and use

O-rings are sealing elements which, upon being subjected to pressure, function in both radial and axial directions.

After pressure is applied to a system, the O-ring generates sealing power. As the operating pressure increases, so

does the overall sealing pressure. In comparision to other sealing elements,O-rings have a number of advantages:

- easy installation

- availability on stock

- cost effective

- wide range of use in both static and dynamic applications.

O-rings can be used in a number of industrial applications. Due to a wide range of compounds with different

properties, O-rings can be employed to seal virtually all uids and gases.

Fig. 2

Sealing joint

When subjected to pressure, the O-ring is pressed into the opposite side of the groove. To prevent the O-ring

from being pressed into the sealing joint, which would result in the ring being damaged, it is advisable to choose

O-rings with the largest cross-section possible for a particular application.

Under identical operating conditions and equal sealing joint width, an O-ring with a smaller cross-section is

pressed into the (identical) sealing joint relatively more than an O-ring with a larger cross-section. To prevent the

O-ring from being pressed into the sealing joint, a harder O-ring may be chosen or the O-ring can be combined

with a back-up ring (upon inquiry, we can recommend the right size).

Material hardness

The suitable material hardness of O-rings depends on the width of the sealing joint and sealed pressure. The fol-

lowing diagrams (gure 4) show the dependence:

The most important factors for determining the right O-ring hardness are the value of operating pressure and

the width of sealing joint. For high pressures and wide sealing joints, it is advisable to choose harder materials toprevent the O-ring from being pressed into the sealing joint.

If structurally possible, using a O-ring with medium hardness together with a back-up ring is a technically better

solution as the compressive deformation is lower at 70 Sh than at 90 Sh.

type material dimensions

P.S.: Upon enquiry, we can recommend suitable materials and dimensions.

O-ring ordering example

sealjointwidth(mm)

sealjointwidth(mm)

ORINGS STANDARDS (Table 5)

StandardRecommended dimensions of O-rings (mm)

Inner diameter d1

Thickness d2

DIN 3770

2 3,75 1,60

4 10 2,00

10,6 30 2,50

18 50 3,15

30 80 4,00

50 118 5,00

80 315 6,30

118 500 8,00

190 800 10,00

ISO 3601

1,8 17 1,80

14 38,7 2,65

18 200 3,5540 400 5,30

109 670 7,00

US Standard(AS 568A)

(MS 295 13)

1,78 133,07 1,78

1,24 247,32 2,62

4,34 456,06 3,53

10,46 658,88 5,33

113,67 658,88 6,99

Swedish Standard(SMS 1588)

3,1 37,1 1,60

3,3 17,3 2,40

19,2 144,3 3,00

44,2 499,3 5,70

144,1 249,1 8,40

French Standard

2,4 8,9 1,90

8,9 18,4 2,70

18,4 37,3 3,60

37,43 113,67 5,33

113,67 393,07 6,99

Fig. 3

F

= =

compression


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98O-RINGS O-RINGS


Installation instructions

Given the functionality and quality of O-rings, they are most suitable for static application. For dynamic applications,

there are certain restrictions which must be observed. It is important to comply with pressure and temperature

limits, medium type, surface roughness, size of sealing joint and other parameters.

The following graphs show values for compression of O-rings for various applications. If these values are observed,

sufficient contact surface necessary for good sealing peformance is ensured. In dynamic applications, these values

must be lower due to higher friction.

deformation(%)

2. DETERMINING THE RIGHT ORING SIZE

It is always advisable to choose O-rings with the largest thickness (d2) possible as they have several advantages

compared to O-rings with lower d2values:

- lower abrasion which means higher service life

- lower deformation

- larger contact surface

To determine the dimensions of the groove and the inner diameter of the O-ring, proceed as follows:

- choose the highest possible thickness (d2) for your construction

- dimensions of L1and S grooves can be found in the tables for installing dimensions

- the basic groove dimension is given for the main ring types:

a) sealing on the outside da= D

a- 2 x S

b) sealing on the inside Db= d

b+ 2 x S

- the inner dimension (d1) is determined according to the moulds list for the main ring types:

- sealing on the outside:

- the inner O-ring diameter should be identical or only slightly smaller than the

dagroove diameter

d1= d

a

< max. 6 %

- it is recommended to lightly position the ring on the groove diameter

- sealing on the inside:

- the inner O-ring diameter should be identical or only slightly smaller or larger than

the dbpiston rod diameter

> max. 3 %

d1= d

b

< max. 6 %

- this ensures that the O-ring has the desired larger dimension on the outer diameter

Fig. 6

thickness d2(mm)


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1110O-RINGS O-RINGS


Detailed groove construction

The grooves in which the O-rings are positioned should have a rectangular recess. Maximum allowed wall bevel is

5%. It is important that the pressure of the medium can spread along the whole S prole. To this end, is it necessary

to determine the adequate size of the groove width L1 and the sealing joint on the pressure side. Because the

O-ring material has higher heat expansion than metals, and to account for any swelling, the inner volume of the

groove should be about 25% larger than the O-ring volume. To ensure that the O-ring does not get jammed or cut

during assembly, it is necessary to take care that the bevel values (see g. 6) are not lower than those stated in the

following table (table 6).

3. STATIC SEALING RADIAL DIMENSION RECTANGULAR GROOVE

O-rings may be used as a static sealing element with radial compression, for example for sealing of valves, ttings,

hydrualic or pneumatic cylinders. They can be employed for sealing both on the inside and on the outside. If,

for reasons of design, the sealing joint equals zero, it is possible to seal pressures of 500 bar and higher. At high

or pulsating pressure, or for larger dimensions of sealing joints which are results of the nature of the technical

construction, it is recommended to use retainer rings.

Fig. 7

Fig. 8

If retainer rings are used, the groove width value must be larger corresponding to the added width of the retainer ring.

Bevel and radius - see table 6 and 7.

For pulsating pressure, this value must be taken from table 18 (dynamic sealing).

MINIMUM BEVEL in mm (table 6)

Thickness d2

min. bevel z Thickness d2

min. bevel z

1,0 1,0 4,0 2,0

1,5 1,0 4,5 2,3

1,6 1,0 5,0 2,5

1,8 1,1 5,3 2,7

1,78 1,1 5,33 2,7

1,9 1,2 5,7 3,0

2,0 1,2 6,7 3,1

2,4 1,4 7,0 3,6

2,5 1,4 6,99 3,6

2,65 1,5 8,0 4,0

2,62 1,5 8,4 4,2

3,0 1,6 9,0 4,3

3,5 1,8 10 4,5

3,55 1,8 12 5,0

3,53 1,8 15 7,0

FILLET in mm (table 7)

Thickness d2

1,0 to 2,5 2,5 to 10

radius r1

0,1 0,25

radius r2

0,2 0,6

INSTALLING DIMENSIONS STATIC SEALING (table 8)

Thickness d2

Depth S Width L1

Thickness d2

Depth S Width L1

1,0 0,8 1,3 4,0 3,15 5,2

1,5 1,15 1,9 4,5 3,6 5,8

1,6 1,2 2,1 5,0 4,0 6,5

1,8 1,35 2,3 5,3 4,3 6,9

1,78 1,35 2,3 5,33 4,3 6,9

1,9 1,45 2,4 5,7 4,65 7,4

2,0 1,5 2,6 6,0 4,96 7,8

2,4 1,8 3,1 7,0 5,85 9,1

2,5 1,9 3,2 6,99 5,85 9,1

2,65 2,0 3,4 8,0 6,75 10,4

2,62 2,0 3,4 8,4 7,15 10,9

3,0 2,3 3,9 9,0 7,7 11,7

3,5 2,7 4,5 10 8,65 13,0

3,55 2,75 4,5 12 10,6 15,6

3,53 2,75 4,5 15 13,5 19,5

TOLERANCE AND MATING in mm (table 9)

Dimensions Tolerance

Da, d

bH 8/f 7

da

h 11

Db

H 11

up to 4 up to 6 up to 8 up to 10

+0,2/0 +0,3/0 +0,4/0 +0,5/0

RECOMMENDED ROUGHNESS R MAX. IN m (table 10)

Area Roughness Ra

Basic groove radius da, D

b1,6

Groove side 3,2

Sealing surface da, D

b1,6

MAXIMUM SEALING JOINT F in mm STATIC SEALING (table 11)

Hardness (Sh A) Pressure (bar)Maximum sealing joint F

without retainer ring with retainer ring

70

25 0,25

0,350 0,2

100 0,15

80

50 0,25

0,3100 0,2

150 0,15

200 0,1

90

100 0,25

0,3150 0,2

200 0,15

250 0,1


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1312O-RINGS O-RINGS


4. STATIC SEALING - AXIAL DIMENSION

Static sealing - axial installing dimensions - rectangular groove

O-rings are used as static sealing elements with axial deformation, for example for sealing of shafts or covers. At

high pressures, it is important to make sure that the screws are sufficiently prestressed and that the metal parts

are tted tightly enough. This ensures that the sealing surfaces cannot disconnect under pressure and prevents

occurance of gaps.

If optimal construction is presumed, pressures of 1000 bar and higher can be sealed. If the pressure comes from

the outside, it is necessary to choose O-rings with slightly smaller (about 1 - 2%) d1inner diameter than the inner

groove diameter d3. If the pressure comes from the inside, it is necessary to chose O-rings with slightly larger

(about 1 - 2%) outer diameter than the groove diameter D3.

Installing dimensions see table 8

Static sealing - axial installing dimensions - trapezoidal groove

Trapezoidal grooves for O-rings are useful if the function of the sealed joint requires that it is

regularly opened while the O-ring stays rmly attached in the groove. The dimensions of the

O-rings have to be chosen according to the following formula for inner diameter of the O-ring:

d1= d

m- 2 x d

2

Static sealing - axial-radial installing dimensions - triangular groove

These installing dimensions are generally not recommended as they do not allow sufficient space for possible

changes in the O-ring volume. Rectangular grooves are a more suitable alternative. Sometimes, triangular grooves

are used to seal shafts or covers. For such aplications of O-rings in triangular grooves, the following table states the

O-ring thickness (d2) values in relation to the bevel value b.

TOLERANCE in mm (table 12)

Thickness d2


Groove depth S +0,05/0 +0,07/0 +0,09/0 +0,1/0

Groove width L1

+0,2/0 +0,3/0 +0,4/0 +0,5/0

Diameter d3

h 11

Diameter D3

H 11

Radii table 7

Roughness table 10

INSTALLING DIMENSIONS TRAPEZOIDAL GROOVE in mm (table 13)

Thickness d2

3,5 5 5,33 5,7 6,99 8 8,4 9 10

Groove depth ST

2,8 4,15 4,4 4,8 5,95 6,85 7,25 7,8 8,7

Groove width LT

3,05 4,1 4,35 4,75 5,65 6,5 6,8 7,25 7,95

Radius rT

0,25 0,25 0,25 0,4 0,4 0,5 0,5 0,5 0,5

Radius RT

0,8 1,5

Inner diameter d1

see text

Angle 24

TOLERANCE in mm TRAPEZOIDAL GROOVE (table 14)

Groove depth ST

() 0,05

Groove width LT

() 0,05

Roughness grades Table 10

INSTALLING DIMENSIONS TRIANGULAR GROOVE in mm (table 15)

Thickness d2

Bevel width b Radius R

1 1,02 1,4

1,2 1,25 1,6 +0,1 0,2

1,5 1,52 2

1,6 2,1

1,8 1,78 2,4 +0,1 0,3

1,9 2,6

2 2,7

2,4 3,2 +0,1 0,4

2,5 3,4

2,6 2,26 3,5

2,65 2,7 3,6 +0,15 0,6

3 4,1

3,15 4,3

3,5 3,53 4,7 +0,15 0,9

3,55 3,6 4,8

4 5,4

4,5 6,1 +0,15 1,2

5 6,8

5,3 5,33 7,2

5,7 7,7 +0,2 1,5

6 8,1

6,3 8,5

7 6,99 9,5 s+0,2 2

8 10,8

8,4 11,4

10 13,5 +0,25 2,5

12 16,2

14 19

16 21,6 +0,25 3

20 27


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1514O-RINGS O-RINGS


5. DYNAMIC SEALING

O-rings are not an entirely suitable sealing element for dynamic applications as the sliding movement at growing

pressure makes necessary lubrication more difficult. This quickly leads to increased abrasion. Most of all, the service

life depends on the following factors: presence of lubricating layer, pressure values, temperature, size of sealing

joint, speed of sliding movement, medium type as well as the quality of surface areas of metal parts. Limits of 100

bar and 0,3 m/s should not be exceeded. If the sealing joint is rather larger in size, back-up rings should always be

used on both sides of the O-ring. In most cases, more suitable sealing elements can be found for dynamic sealing.

If back-up rings are used, the groove width value must be larger corresponding to the added width of the back-up ring.

L1dimension tolerance - see table 17.

Hydraulic devicesWhen dynamic sealing is used for

hydraulic devices, the lubricant type

is one of the most important factors

with regard to service life. Lubricating

effect of mineral oils is substantially

better compared to water or water

- oil emulsions. The second crucial

factor inuencing the service life is the

number and height of strokes. Given

this, O-rings are more suitable for

spindle of valve than for cylinders with

high strokes and quick speed.

Pneumatic devicesFor pneumatic devices, the same

principles as for hydraulic devices

apply. Although the pressures in

pneumatic devices are lower, sufficient

lubrication is harder to achieve than

in hydraulic devices. To achieve lower

friction on acceleration, is is possible

to install the O-ring as a oating ring

when used for pneumatic devices. The

groove depth S and width L1must be

larger than the thickness (d2).

Rotational movementsO-rings are generally not suitable

for rotational movements as it is not

possible to ensure sufficient lubricant

supply to sealing surfaces. This leads

to increased friction, local overheating

and quick wear. In exceptional cases

where no other sealing element can be

used, it is recommended to install the

O-ring on the solid part to avoid the

impact of centrifugal forces. For most

rotary applications, there are moresuitable other sealing elements.

Installation bevels and diameters - see tables 6 and 7.

INSTALLING DIMENSIONS DYNAMIC SEALING (table 16)

Thickness d2

Width L1

Depth - hydr. SDepth -

pneum. SThickness d

2Width L

1Depth - hydr. S

Depth -pneum. S

1,0 1,3 0,9 0,95 3,53 4,2 3,1 3,25

1,5 1,9 1,3 1,35 4,0 4,8 3,5 3,7

1,6 2,0 1,4 1,45 4,5 5,4 4,0 4,2

1,8 2,3 1,5 1,55 5,0 6,0 4,45 4,65

1,78 2,3 1,5 1,55 5,3 6,4 4,7 4,95

1,9 2,4 1,7 1,7 5,33 6,4 4,7 4,95

2,0 2,4 1,7 1,8 5,7 6,9 5,1 5,35

2,4 2,9 2,1 2,15 6 7,2 5,4 5,65

2,5 30 2,2 2,25 7,0 8,4 6,3 6,6

2,65 3,1 2,3 2,35 6,99 8,4 6,3 6,6

2,62 3,1 2,3 2,35 8,0 9,6 7,2 7,5

3,0 3,6 2,6 2,75 8,4 10,1 7,6 7,9

3,5 4,2 3,1 3,25 9,0 10,8 8,2 8,5

3,55 4,2 3,1 3,25 10 12,0 9,1 9,5

TOLERANCE AND ENGINEERING FIT in mm (table 17)

Dimensions Tolerance

Da, d

bH 8/f 7

da

h 9

Db

H 9

Ring diameter d2


Groove width L1

+0,2/0 +0,3/0 +0,4/0 +0,5/0

RECOMMENDED ROUGHNESS R MAX. in m (table 18)Area Roughness R

a

Basic groove radius da, D

b1,6

Groove side L1

3,2

Sliding surfaces Da, d

bmax. 0,4

MAXIMUM SEALING JOINT F in mm DYNAMIC SEALI NG (table 19)

Hardness (Sh A) Pressure (bar)Maximum sealing joint F

without back-up ring with back-up ring

70

10 0,25

0,325 0,2

50 0,1

80

25 0,25

0,350 0,2

75 0,1

90

50 0,2

0,375 0,15100 0,1


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1716O-RINGS O-RINGS


PTFE O-rings

PTFE O-rings can be used in the temperature range from -200C to +260C. Moreover, they are resistant to most of

all chemical substances. Due to limited elasticity which also means greater prestressing force, PTFE O-rings should

be only used for static sealing in axial groove constructions. However, they can also be placed in grooves which

were originally designed for elastomeric O-rings. In such cases, it is necessary to take care that the PTFE O-ring is

not stretched or packed too tightly during installation. For special cases which require the chemical properties

of PTFE combined with the elastic properties of elastomeric substances, we can deliver PTFE enveloped O-rings

made of Viton or silicone.

Groove dimensions for O-rings used for vacuum sealing

Take care that the O-ring lls the groove as tightly as possible so that no leakage occurs as a result of shrinkage

of the elastomeric substance in the vacuum. Moreover, it is necessary to prevent the O-ring from moving in the

groove. The processing of sealing surfaces should be carried out with the greatest possible care. For vacuum

sealing, gas permeability of the O-ring material is a signicant factor. This material characteristic depends on the

nature of material and varies with temperature. Butyl and Viton are suitable materials for this sealing type; kalrez

can also be used under certain circumstances.

Packings with circular diameter (cords)

Sets for service

- assembly boxes for use in dynamic applications

(contains O-ring type series depending on the box type) - please inquire for a list of type series

- assembly boxes for bonding of O-rings in static applications

(contains 12 dimension of cords, adhesive, measure, other equipment)

GROOVE DIMENSIONS FOR PTFE ORINGS (table 20)

L = d + 10%

S = d - 10% up to 20% for d < 5,0

S = d - 10% up to 15% for d > 5,0

R = (d + 10%) / 2

GROOVE DIMENSIONS FOR VACUUM SEALING (table 21)

Thickness d2

1,8 2,65 3,55 5,3 7,0

1,78 2,62 3,53 5,33 6,99

Depth S 1,27 1,32 1,88 1,98 2,57 2,62 3,86 3,94 5,11 5,18Width L

12,1 2,24 3,0 3,12 3,99 4,14 5,99 6,12 7,75 7,87

Radius r1, r

2Table 7

DIMENSIONS RANGE (table 23)

NBR 70 Sh FPM 70 Sh

diameter d2

tolerance diameter d2

diameter d2

1,55 0,2 2 0,2

1,78 0,2 2,4 0,2

2 0,2 2,5 0,2

2,4 0,25 2,62 0,25

2,5 0,25 3 0,25

2,62 0,25 3,5 0,3

3 0,25 5,53 0,3

3,2 0,35 4 0,3

3,5 0,35 4,5 0,3

3,53 0,35 4,75 0,3

4 0,35 5 0,34,5 0,4 5,33 0,3

5 0,4 5,5 0,3

5,33 0,4 5,7 0,3

5,5 0,4 6 0,3

5,7 0,4 6,35 0,4

6 0,4 6,5 0,4

6,35 0,55 6,99 0,4

6,5 0,55 7 0,4

6,99 0,55 7,5 0,4

7 0,55 8 0,4

7,5 0,55 8,4 0,4

8 0,55 8,5 0,4

8,4 0,55 9 0,4

8,5 0,55 10 0,4

9 0,55 11 0,5

10 0,55 12 0,5

11 0,65 13 0,5

12 0,65 14 0,5

13 0,65 15 0,5

14 0,65 16 0,5

15 0,65 18 1

16 0,65 20 1

18 0,85 22 1

20 0,85 25 1

22 0,85 30 1,3

25 1

30 1Upon inquiry, we can also deliver sealing cords made

of NBR 80 Sh and 90 Sh, FPM 80 Sh and 90 Sh or Si.


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Dimension series - material NBR Dimension series - material NBR


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www.dimer-group.com

51O-RINGS O-RINGS

Dimension series - material FPMDimension series- material FPM

www.dimer-group.com

50O-RINGS O-RINGS

Dimension series - material NBR Dimension series - material FPM


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5352O-RINGS O-RINGS

Dimension series - material FPM Dimension series - material FPM


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5554O-RINGS O-RINGS



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5756O-RINGS O-RINGS



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5958O-RINGS O-RINGS



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6160O-RINGS O-RINGS



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6362O-RINGS O-RINGS



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6564O-RINGS O-RINGS



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6766O-RINGS O-RINGS



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6968O-RINGS O-RINGS



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7170O-RINGS O-RINGS



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7372O-RINGS O-RINGS



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7574O-RINGS O-RINGS



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7776O-RINGS O-RINGS



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7978O-RINGS O-RINGS



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8180O-RINGS O-RINGS



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8382O-RINGS O-RINGS


X-rings were primarily developed to limit the twisting of rings in the groove. The base is the square-shaped cross-

section with ring grooves. The width and thickness of these rings correspond with the dimensions of the classical

O-rings. Therefore, both types are exchangeable. The ring has a small touch surface for pressure up to 40 bars as

well as less friction than the O-ring.

The X-ring cannot roll away and therefore it will also not twist. An advantage of the X-ring over the O-ring is only

the fact that it is more advantageous for radial movement if it is not possible to use shaft seals. The life cycle is

dependent upon the quality of the surface of the friction surfaces.

Cross-section Initial Radial Pressure Groove dimensionsRadius

Maximumradius joint

W

Dynamicapplication

max.min.

Staticapplication

max.min.

Depth of Groove Width of Groove

Dynamict +0,05

Statict/h +0,05

b, b +0,2 b +0,2 b +0,2 r S

1,020,300 0,350

0,80 0,75 1,20 - - 0,10 0,030,115 0,165

1,270,330 0,430

1,00 0,90 1,40 - - 0,10 0,030,145 0,245

1,520,350 0,450

1,25 1,15 1,70 - - 0,22 0,040,165 0,265

1,780,360 0,460

1,50 1,40 2,00 3,40 4,80 0,22 0,050,175 0,275

2,620,400 0,450

2,30 2,25 3,00 4,40 5,8 0,30 0,080,215 0,265

3,530,430 0,530

3,20 3,10 4,00 5,40 6,80 0,40 0,080,205 0,305

5,330,560 0,710

4,90 4,75 6,00 7,70 9,40 0,40 0,100,250 0,400

7,000,700 0,950

6,40 6,20 8,00 10,50 13,00 0,60 0,100,350 0,600

TECHNICAL PARAMETERS

Pressure 400 bars (500 bars in combination with the supporting ring)

Speed 0.5 m/s

Temperature -50 up to +200 C

Standard Thickness of X-Rings

1,78 2,62 3,53 5,33 7,00

If you have any special requirements for X-rings, please contact our technical department.

We will make recommendations based on your needs:

- Material of sliding surfaces

- Surface treatments

- Ways of greasing

- Shapes of grooves

- Tolerance of grooves

- The suitable dimension with the recommended tolerance

- The complete technical and design documentation


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catalogue o rings en

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