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Shaft diameter d1

Nominal diameter of the shaft to be sealed / tolerance h11 / roundness IT8

Surface machined without twist (e.g. twist-free in plunge grinding with a rotating workpiece)

Shaft preferably hardened 45 HRC to 63 HRC

Requirements for the roughness of the counter surface:

Rz = 1.0 µm to 5.0 µm
Ra = 0.2 µm to 0.8 µm
Rmax < 6.3 µm
Requirements for the roughness of the counter surface with a pressure load > 0.1 Mpa:

Rz = 1.0 µm to 3.0 µm
Ra = 0.2 µm to 0.4 µm
Rmax < 6.3 µm
Design of the shaft (assembly phase, etc.) according to Freudenberg recommendations from the technical manual.

Additional information: If you have leeway with the shaft diameter and are not necessarily dependent on the information you have given here, you can use the professional mode to get other offers for similar dimensions.

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Housing diameter d2

Nominal diameter of the housing bore to be sealed / tolerance H8

Requirements for the roughness of the housing bore for type BA (elastomer coating on the outside diameter):

Rz = 10 µm to 25 µm
Ra = 1.6 µm to 6.3 µm
Rmax < 25 µm
Requirements for the roughness of the housing bore for types B1 and B2 (metal seat on the outside diameter):

Rz = 6.3 µm to 16 µm
Ra = 0.8 µm to 3.2 µm
Rmax < 16 µm
Housing bore design (assembly phase, etc.) according to Freudenberg recommendations from the technical manual.
                  

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Width b

The axial width of the seat of a Simmerring® can vary depending on the space in the housing. The design of the assembly phase must be taken into account here. It must be ensured that the cylindrical outer casing of Simmerring®s with an elastomer outer casing is installed completely in the cylindrical part of the bore. With the BAB..SL design, it should be noted that the dust lip protrudes axially beyond the width of the seat specified in the nomenclature.

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Material

The material of the elastomer part of a Simmerring® can consist of fluorine rubber ( FKM ), acrylonitrile butadiene rubber ( NBR ) or, for the B2PT design, polytetrafluoroethylene ( PTFE ).

The choice of a suitable material depends on the temperature:

FKM: -25 to +160 °C
NBR: -40 to +100 °C
PTFE: -80 to +200 °C
In addition, the choice of material is determined by the medium to be sealed (see Freudenberg catalog or Freudenberg technical manuals)

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Design

The nomenclature for Simmerring®s defined by Freudenberg summarizes the most important features of the Simmerring® at a glance:

BA... = elastomer outer sheath
B1... = metal housing with sheet metal as outer casing
B2... = metal housing with two metal sheets as outer casing
(BA)U..., (BA)UM..., (BA)..., (B1)... , (B2)... = sealing lip profiles for max. pressure load of 0.5 bar (depending on other operating conditions)
(BA)FU..., (B1)FU..., (B2)FU..., ... = sealing lip profiles for max. pressure load of 0.2 bar (depending on other operating conditions)
BAB... = pressure seal (max. pressure load dependent on other operating conditions)
...SL = protective lip (max. peripheral speed 8 m/s - note separate limit speeds for type BAB..SL)
...OF = without spring (only to be used as additional front seals to protect against external contamination)
Design Standard: BA , BASL, BAUM, BAUMSL, B1, B1SL, B2, B2SL, BABSL, MSS1, BAOF, B1OF, MSS7

Design pressure: BABSL, PPS, B2PT (max. 10 bar, depending on other operating conditions)

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Dust lip

A protective lip is necessary to protect the sealing edge against moderate exposure to dirt, dust or moisture from the air side.