Shaft seals (Oil Seals)
An oil seal, colloquially known as a simering, is a shaft sealing ring used in mechanical devices to prevent the leakage of liquid or gas between two surfaces. Its main purpose is to ensure that lubricant stays inside and contaminants stay outside, which extends the service life of bearings and other moving parts.
Oil seals are often made from materials that are resistant to wear and chemicals. They come in various shapes and sizes and are used in the automotive industry, mechanical engineering, agricultural machinery, and many other sectors. They are essential for the proper functioning of engines, transmissions, and hydraulic systems. Proper selection and installation of oil seals ensure trouble-free operation of equipment and minimize the risk of malfunctions.
What oil seals do we offer
We offer over 2,700 sizes for shafts ranging from 4 to 380 mm, made of NBR, Viton, and silicone, with or without a dust seal. Select a shaft seal based on the dimensions d × D × B and the material of the original seal.
How to select a shaft seal based on dimensions
The dimensions of a shaft seal are written as d × D × B in millimeters: d is the shaft diameter, D is the outer diameter (the bore in the housing), and B is the width. A 30 × 40 × 7 oil seal, for example, fits a 30 mm shaft into a 40 mm bore and is 7 mm wide. Enter all three dimensions in the filter.
Available designs and materials
|
Design / Material |
Number in the selection |
When to Choose It |
|---|---|---|
|
GP/WAS (with dust cap) |
2,200+ |
The second cutting edge protects the seal against external contaminants |
|
G/WA (without dust cap) |
500+ |
Clean environment free of dust and contaminants |
|
NBR |
2,300+ |
The most common material |
|
Viton (FKM) |
200+ |
Higher temperatures and more demanding media |
|
Silicone (MQV) |
189 |
According to the machine manufacturer’s specifications |
Crankcase or transmission oil seal
It is selected just like any other oil seal: based on the dimensions d × D × B and the material of the original seal. The dimensions are usually stamped on the side of the old oil seal.
Need help? We’re available on weekdays from 7:00 a.m. to 3:00 p.m. at +420 732 445 248 or at podpora@wafarex.com.
Frequently Asked Questions
What is a shaft seal (oil seal)?
A shaft sealing ring that seals a rotating shaft: it prevents oil or lubricant from leaking out and contaminants from entering.
How do you read a seal dimension, such as 30×40×7?
30 mm is the shaft diameter, 40 mm is the outer diameter, and 7 mm is the width.
NBR, Viton, or MQV?
NBR is the most common material, with a maximum temperature rating of up to 100 °C depending on the type of fluid used. Viton (FKM) is chosen for higher temperatures and more demanding media. MQV is a heat-resistant, flexible, and chemically stable material with excellent resistance to UV radiation, ozone, and aging; it is suitable for operating temperatures ranging from −60 °C to +200 °C and, for short periods, up to +230 °C.
What is the difference between G/WA and GP/WAS?
G/WA does not have a dust seal; GP/WAS has an additional dust seal—a second sealing lip to prevent contamination from the outside.
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