The SCW profile is a single lip radial seal composed of a single metal cage with a rubber liner and a primary sealing lip with an integrated spring. The sealing lip has splines with a bi-directional direction of rotation, to follow the same rotation of the shaft and to control the expulsion of lubricants.
Good static sealing.
Compensation of different thermal expansion.
Reduced risk of fretting corrosion.
Easy to mount with very limited rebound effect.
Seals for low and high viscosity fluids.
Modern primary sealing lips with low radial forces.
Grooved sealing lips with a bi-directional direction of rotation.
See our Installation guide for oil seals to perform a correct installation of the seal.
| ø | ºC | bar | m/s |
|---|---|---|---|
|
10-1270 mm |
-55ºC/225ºC |
≤0.3 bar |
≤10 m/s |
Elastomer
NBR 70-75 Shore A
FKM 75-80 Shore A
VMQ 70-75 Shore A
ACM 70-75 Shore A
EPDM 70-75 Shore A
HNBR 70-75 Shore A
Metal casing
AISI 1060-90 - AISI 304 - AISI 316
Spring
AISI 1060-90 - AISI 302 - AISI 304 - AISI 316
| MANUFACTURER | EQUIVALENCE |
|---|---|
|
SIMRIT |
BA |
|
STEFA |
CB |
|
SKF |
HMS4 |
|
PAULSTRA |
IE |
|
NATIONAL |
35 |
Housing diameter | Metal cage | Elastomeric coating | Housing with grooves |
|---|---|---|---|
| ≤ 50.0 | +0.10 / +0.20 | +0.15 / +0.30 | +0.20 / +0.40 |
| <50.0 ≤80.0 | +0.13 / +0.23 | +0.20 / +0.35 | +0.25 / +0.45 |
| <80.0 ≤120.0 | +0.15 / +0.25 | +0.20 / +0.35 | +0.25 / +0.45 |
| <120.0 ≤180.0 | +0.18 / +0.28 | +0.25 / +0.45 | +0.30 / +0.55 |
| <180.0 ≤300.0 | +0.20 / +0.30 | +0.25 / +0.45 | +0.30 / +0.55 |
| <300.0 ≤500.0 | +0.23 / +0.35 | +0.30 / +0.55 | +0.30 / +0.55 |
| <500.0 ≤630.0 | +0.23 / +0.35 | +0.35 / +0.65 | +0.40 / +0.75 |
When not under pressure, the inside diameter of the sealing lip is always smaller than the shaft diameter. The difference between the two dimensions is known as interference or pre-fitting. Depending on the shaft size, the sealing lip diameter is estimated to be between 0.8 mm and 3.5 mm smaller. It will depend on the setting chosen by each manufacturer.
