Oil seals play a critical role in the smooth operation of many factories and a variety of industrial and commercial machinery. Available in both imperial and metric sizes, they come in single-lip and double-lip designs, making them versatile for different applications. Motors, hydraulic systems, pistons, and pumps rely on oil seals to shield their internal components. Depending on the specific use case, there are multiple material, size, and configuration options to suit your requirements. Discover more about oil seals, their composition, and the significant benefits they bring to your equipment.
### What Exactly Is an Oil Seal, and What Does It Comprise?
An oil seal serves two primary functions: retaining lubricants while preventing dirt and contaminants from entering moving components. This crucial separation happens between surfaces that are in relative motion, such as a shaft or the inner race of a bearing and its housing. Properly installed, oil seals can stop leaks and maintain the lubrication of bearings, ensuring the shaft and its bearings function optimally.
A typical oil seal usually includes three main parts: an outer ring, the sealing element, and a spring. The outer metal ring offers strength and stability to the seal within the bore or recessed groove. Connected to this ring is the sealing element. This flexible interior component, often an O-ring, stops fluid leaks between the shaft and housing. A spring applies consistent pressure, deforming the O-ring to create a dependable seal while applying radial force to the shaft.
Oil seals generally vary in materials and types according to the respective application. Common materials include:
- **Nitrile Buna-N 70**: Known as NBR, it’s compatible with many environmental conditions and is cost-effective, making it a top choice for industries. Nitrile performs well within the temperature range of -30° to 250° F and withstands exposure to water, hydraulic fluids, gas, silicone, vegetable, and animal oils.
- **Fluoropolymer (FKM/Viton®)**: These seals are ideal for high-temperature environments up to about 400° F. They also exhibit low compression properties and are highly resistant to solvents, gas, and petroleum or transmission oils, making them suitable for related applications.
- **Silicone**: Made from vinyl-methyl-silicones (VMQs), they perform well in temperatures ranging from -140° to 392° F. Silicone is also resistant to adverse weather, light, and ozone, commonly used in healthcare, food industries, and pneumatic/hydraulic systems.
- **Polyacrylate**: Combining quality and cost-effectiveness, this material is highly resistant to oxidation and heated oil, withstanding temperatures from -25° F to 300° F. It finds applications in vehicle transmissions, shaft seals, O-rings, and more.
### What Advantages Do Oil Seals Offer?
Oil seals provide several benefits:
- **Low Friction Levels**: The lubrication inside the seal ensures minimal contact between the seal lip and the rotary shaft, reducing the risk of burning or wear.
- **Compact Size and Lightweight Design**: Despite their small size and lightweight structure, oil seals boast impressive durability.
- **Reliable and Robust Performance**: Even under harsh conditions or extreme temperatures, these seals maintain their integrity.
- **Simplicity in Construction**: Easy to handle and install, oil seals can be replaced quickly without disassembling machines.
- **Versatility**: Standard lip seals work well in dry environments or those lacking lubrication, but oil seals offer enhanced functionality.
### Why Choose Emerson for Your Oil Seal Requirements?
Selecting high-quality oil seals for your roller bearings, precision bearings, and other components is essential. At Emerson Bearing Company, we go beyond manufacturing oil seals. Drawing on over 50 years of expertise in bearings and related components, our team helps you pick the perfect oil seals for your specific needs, no matter how complex your application. If we don’t have a particular part in stock from our extensive inventory, we leverage a global sourcing network to deliver premium products. Our goal is to offer a seamless experience for our clients, from initial consultation and budgeting to oil seal selection and timely delivery, including same-day shipping options.
Our oil seals cater to a broad spectrum of industrial sectors both locally and internationally. As part of our online product catalog, we offer:
- Garlock isolator-style oil seals
- Metric oil seals
- Inch measurement oil seals
We also prioritize exceptional customer service and are available 24/7 to assist you. Contact us to learn more about our oil seals and additional services.
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