QUALITY & EXPERTISE FOR YOUR SEALING NEEDS

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EXTRUSION GAPS

Radial section

S

Radial gap

F/2

10 MPa

20 MPa

40 MPa

5.50

0.25

0.15

0.10

7.75

0.30

0.20

0.15

10.50

0.30

0.20

0.15

12.25

0.30

0.20

0.15

14.00

0.45

0.30

0.25

19.00

0.55

0.40

0.35

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SURFACE ROUGHNESS

Roughness

Dynamic surface area

Static surface area

Groove flanks

Ra

0.05 - 0.2 µm

≤1.6 µm

≤3.2 µm

Rz

0.4 - 1.6 µm

≤6.3 µm

≤10.0 µm

Rmax

0.63 - 2.5 µm

≤10.0 µm

≤16.0 µm

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CHAMFERS AND RADIUS

Radial section

S

Radius

R1

Radius

R2

Chamfer

C

5.50

0.30

1.00

3.00

7.75

0.30

1.30

3.00

10.50

0.30

1.80

5.00

12.25

0.30

1.80

6.00

14.00

0.30

2.50

8.00

19.00

0.30

3.00

10.00

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TECHNICAL DATA

Temperature

-30°C / +200°C

Pressure

50 MPa

Speed

2 m/s

Media

Mineral hydraulic oils

Fire-resistant liquids

Biocompatible fluids

Water

Gas

Others (contact our experts)

The figures above indicate the maximum values and may not be cumulated. They may be

developed, depending on the materials used.

ROD SEALS

BECA

157-158

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DESCRIPTION

The BECA 157 - 158 profile is a

double acting rod composite seal

composed of a filled PTFE friction

ring and two pre-tightened rubber

O'Rings. It can be assembled in a

groove according to standard ISO

7425/2. Option of connecting the

seal to 1 or 2 back-up rings.

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ADVANTAGES

Optimal sealing for separating two fluids

Low friction coefficient;

no stick-slip effect

Excellent abrasion resistance

Wide temperature range and excellent

chemical resistance, depending on

the material selected for the O'Ring

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APPLICATIONS

Mobile hydraulics

Machine tools

Presses

Hydro-pneumatic suspension systems

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MATERIALS

Friction ring

Bronze-filled PTFE

O'Rings

NBR 70 Shore A

Other grades of materials are

available. Please refer to the

materials table on the next page.

HYDRAULIC SEALS | ROD SEALS |

BECA 157 - 158