Datasheet

© Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007560
Technical Principles | O-Rings and Static Seals
Hydraulics – rotating motion
The sealing of a rotating shaft should only be attempted
with an ISC O-Ring if there is no room for the installation
of an effective seal and the operating conditions are not
severe. Circumferential speeds of up to approx. 4 m/s
can be handled with non-pressurised media, insofar as
no greater demands are made with regard to the serv-
ice life and sealing effect. A Simmerring is in any case
more dependable. The ISC O-Ring is to be installed in
the stationary outer housing part. The ISC O-Ring inside
diameter should not be more than approx. 5% larger
in its installed position than the shaft to be sealed. It
must be tightly packed when being installed. In order
to avoid warping in its groove of the tightly packed,
installed ISC O-Ring, the groove width may only be
slightly larger than the maximum ring thickness.
Sufficient lubrication and good heat dissipation must be
provided for. The hardness of the ISC O-Ring material
may not be less than 80 Shore A. The shaft to be sealed
must hardened on the surface to approx. 60 HRC.
In the fitting area of the ISC O-Ring, the shaft should be
ground non-oriented in the plunge-cut and the surface
roughness should be R
max
≤2 µm.
Recommendation d
1
Ring strength d
2
… 9 1,78
of 8 … 19 2,40 and 2,62
of 18 … 40 3,00 and 3,53
of 37 … 130 5,33 and 5,70
of 110 … 150 6,99
Tbl. 8
Groove dimensions for ISC O-Ring fitting for hydraulics – rotating movements
15°
t
r
2
r
1
b
1
+
0
,
2
d
6
H
9
Ø
d
5
f
7
Ø
d
1
0
H
8
Ø
Z
R
m
a
x
≤
2
Plunge ground
d
2
Groove depth t Groove width b
1
+ 0,2 Chamfer 15° Z
1,78 1,6 ±0,04 2,0 1,2
1,80 1,6 ±0,04 2,1 1,2
2,40 2,2 ±0,05 2,7 1,3
2,62 2,4 ±0,05 2,9 1,4
2,65 2,4 ±0,05 3,0 1,5
3,00 2,8 ±0,06 3,2 1,5
3,53 3,3 ±0,07 3,9 1,9
3,55 3,3 ±0,07 3,9 1,9
5,30 4,9 ±0,11 5,7 2,4
5,33 4,9 ±0,11 5,8 2,6
5,70 5,3 ±0,11 6,1 2,8
6,99 6,5 ±0,14 7,4 3,0
7,00 6,5 ±0,14 7,4 3,0
Tbl. 9