Custom Oil Seal
Manufacturer
With 13+ years of OEM expertise, Zhonggao—an IATF 16949 certified rubber oil seal manufacturer in China—has been supplying industrial custom seals globally, resolving leakage issues for hydraulic pumps, engines & valves.
Oil Seal, also known as rotary shaft lip seal or radial shaft seal, is a sealing device used between the rotating shaft and the fixed parts in mechanical equipment. Its main function is to prevent lubricating oil (or grease) from leaking from bearings or transmission parts, and to prevent external dust, moisture and impurities from entering the equipment, thereby protecting mechanical parts and extending their service life.
Basic Structure of Oil Seal
Oil seals usually consist of the following key parts:
Sealing lip (Lip)
Made of elastic material (such as rubber), it is in close contact with the rotating shaft to form a dynamic seal. Some oil seals have spiral oil return lines to improve the sealing effect.
Metal Case
Usually made of steel or stainless steel, it provides structural support to ensure that the oil seal is firmly installed on the housing.
Spring (Garter Spring)
Located behind the sealing lip, it provides radial pressure to enhance the sealing effect and prevent leakage caused by shaft runout or wear.
Dustproof lip (Secondary Lip, optional)
Single lip only seals oil, double lip increases dustproof function (second lip blocks external impurities).
Material Properties
Prevent Lubricating Oil Leakage
Keep bearings, gearboxes and other parts lubricated to reduce wear.
Pressure Adaptability
Generally suitable for low pressure environments (< 0.05MPa ), high pressure requires special design.
Low Friction
Reduces shaft wear and energy consumption, suitable for high-speed rotation (linear speed up to 20m/s).
Dustproof and Waterproof
Prevent external dust, mud, water, and chemicals from entering the device.
Temperature Range
Typically -40°C to +150°C (depending on the material, fluororubber can withstand higher temperatures).
Customized Service
Custom Sealing Lip Materials
Common Types That Can Be Customize
Customizable Metal Skeleton Structure Type and Material
Single Lip Oil Seal (Single Lip)
Only one main sealing lip, mainly used for oil prevention.
FKM (fluoro rubber)
High temperature resistance (-20°C-320°C), chemical corrosion resistance. Used in harsh working conditions.
ACM (acrylic rubber)
High temperature resistance (-25°C -+150°C) and ozone resistance, resistant to synthetic oils (such as ester lubricants), but poor water resistance. Suitable for high-performance automotive and industrial seals.
PTFE (polytetrafluoroethylene)
Extremely chemical resistance (resistant to almost all solvents and corrosive media). High temperature resistance (-100°C - +280°C), very low friction coefficient. Suitable for extreme working conditions.
VMQ (silicone rubber)
High and low temperature resistance (-70°C-220°C), but low mechanical strength. Ozone and UV resistance, but poor oil resistance (not recommended for mineral oil). Suitable for non-oil media such as water and coolant.
EPDM (ethylene propylene diene monomer rubber)
resistant to water, steam and ozone, but poor oil resistance (not suitable for mineral oil). Temperature range: -50°C - +150°C. Suitable for non-oil media such as water and coolant.
PU (polyurethane rubber)
high wear resistance and high mechanical strength, but poor high temperature resistance (-30°C - +80°C). Suitable for cylinder seals and low-speed high-load oil seals.
Single Lip Oil Seal (Single Lip)
Only one main sealing lip, mainly used for oil prevention.
Double Lip Oil Seal (Double Lip)
Main sealing lip + dust lip, mainly used for oil and dust prevention.
PTFE Oil Seal
High temperature and corrosion resistance, suitable for harsh environments.
Cassette Seal (Combined Oil Seal
Integrated bearing and seal, easy to install.
Common metal skeleton structure types:
- Fully Encased: The metal skeleton completely encloses the rubber part (only the sealing lip is exposed). It has strong anti-deformation ability and is suitable for high pressure or high vibration environments.
- Semi-Encased: The metal skeleton only partially encloses the rubber (such as the outer diameter or inner diameter). It is light in weight, low in cost, and easy to install.
- All-Rubber: There is no metal skeleton and it is completely fixed by rubber elasticity. It is suitable for non-standard size or flexible installation requirements.
Common materials for metal skeletons
- Ordinary carbon steel (SPCC/SECC): low cost, easy to stamp and form, requires surface anti-rust treatment (such as galvanizing, phosphating).
- Stainless steel (SUS304/SUS316): strong corrosion resistance, no need for additional coating, suitable for humid and corrosive environments.
- Galvanized steel: better anti-rust performance than ordinary carbon steel, but may still rust after long-term use.
- Aluminum: lightweight, corrosion-resistant, but low strength.
Custom Rubber Gaskets For Your Applications
Looking for reliable rubber gasket manufacturers and suppliers? Contact Zhonggao today! Our technical team offers 24/7 online support, free technical consultation, and sample services.
What Sets Zhonggao Ahead
Strong Manufacturing Capability
As a leading rubber gasket factory, we have been equipped with advanced automatic cutting, injection molding, and vulcanizing machines, covers the entire production and testing process from vulcanization to delivery. In this way, we efficiently handle prototype design, short-term production, and large-volume orders to ensure fast delivery.
Strict Quality Control
Our quality control team (6 full-time inspectors, advanced laboratory testing equipment) enforces strict procedures. Using high-quality raw materials, we ensure our products comply with international standards, including IATF 16949, ISO 9001, 14001, and 45001, demonstrating our dedication to quality, sustainability, safety, and customer satisfaction.
Comprehensive Service
Our professional technical team specializes in customized rubber seal design and selection for your products, offering comprehensive expert advice on gasket design solutions. With a proactive service attitude from inquiry response to fast delivery, we ensure customer satisfaction by reliable products, rapid delivery, and high-quality support.
FAQ
Q: Can you customize for clients?
Q: Can we request samples? Are there any charges?
Q: What is the lead time for samples?
Q: What about the lead time for mass production?
Q: What is your after-sales policy?
Q: What quality inspection items are performed for hydraulic oil seals?
Q: What precautions should be taken during installation?
Q: How to extend the life of the oil seal?
Q: How do hydraulic oil seals fail?
Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is well-known as one of the leading oil seal manufacturers and suppliers in China. Please feel free to wholesale custom made oil seal at competitive price from our factory. For more company information, contact us now.
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