Radial shaft seals
A radial shaft seal closes the gap between a rotating shaft and a static housing: lubricant in, dust and water out. A failed seal is behind a large share of premature bearing failures — the seal costs far less than the bearing, but its failure costs far more.
Types and variants
The distinct designs that sit under this category.
Single lip (HMS / R type)
The standard oil seal — enough in clean, enclosed conditions.
With dust lip (HMSA10 / RS type)
A second lip keeps contamination out — the type for dusty, open conditions.
Rubber-covered outside diameter
Restore sealing when the housing bore is worn or slightly damaged.
Material families (NBR, FKM, silicone, PTFE)
Temperature range and fluid compatibility come from here — the wrong compound hardens within weeks.
Where it is used
The applications this category most often serves.
- Gearbox and transmission shaft outputs
- Electric motor and pump shafts
- Wheel hubs and axle assemblies
- Hydraulic and pneumatic equipment
- Agricultural and construction machinery
What we ask when selecting
What we need in order to find the right part. You do not need all of it — we can work out the rest together.
- Three dimensions: shaft × bore × width
- These three numbers are the designation — 35×62×10, for instance.
- Surface speed
- Follows from bore and speed, and it sets the material limit.
- Fluid and temperature
- Mineral oil, synthetic oil, grease or water — four different compounds.
- Pressure and the need for a dust lip
- Under pressure a standard seal is not enough; in dirt a second lip is.
Typical designations
Examples that make the designation readable — not a stock commitment.
- 35×62×10 HMSA10 RG
- With dust lip, NBR — the dimensions are the designation.
- 40×62×8 HMS5 V
- Single lip in FKM (V) for higher temperature.
Other categories in this group
Send us the designation or the dimensions — we will find the match.
A code you cannot find in the catalogue, a faded marking on an old bearing, or just the dimensions — any of the three is enough. The wrong bearing costs more than a late one.