NBR Oil Seals: page 3
If you’re sealing a rotating shaft exposed to oil, chances are you’ll end up with an NBR oil seal – it remains the industry standard, offering the best value for money for most common hydraulic and mechanical applications. It is the material of choice for many equipment manufacturers precisely for this reason: it delivers consistent performance at a predictable cost. View the full range of oil seals in our shop.
Properties of NBR seals in rotating seals
Nitrile rubber withstands contact with mineral oils and greases well, which is why it is the standard material for pumps, gearboxes and hydraulic motors across a wide range of industrial sectors. Its elasticity compensates for minor variations in the clearance between the shaft and the housing without compromising the seal, even when there is slight shaft misalignment.
Thermal and chemical resistance to mineral oils and greases
It performs well up to around 100 degrees Celsius – sufficient for most standard hydraulic applications, including equipment that operates intensively and accumulates heat over long periods. Above this threshold, or when in contact with more aggressive chemicals, a different material is required, such as Viton or silicone, which offer better resistance to extreme thermal and chemical conditions.
Guide to selecting NBR oil seals based on shaft dimensions
You’ll need the shaft diameter, the outer diameter of the housing and the seal width – without precise measurements here, the seal won’t hold and oil leaks will occur. The type of lip (single, double, with or without a spring) also affects how well it retains lubricant and protects against dust, just as with pressure seals or combination seals.
The benefits of buying NBR seals from Hydraulic Seals Store
We have a wide range of standard sizes, plus pressure, combination and cassette types. The catalogue is easy to navigate, prices remain affordable, and delivery is prompt, so that an urgent repair to a machine isn’t delayed by a lack of the right part.