NBR Double-Lip Rotary Shaft Oil Seals

NBR Double Lip Rotary Shaft Oil Seals

NBR Double Lip Rotary Shaft Oil Seals are designed to retain oil or grease and reduce the entry of dust, dirt and other contaminants into rotating equipment. Manufactured with nitrile butadiene rubber (NBR) sealing lips, these seals offer good resistance to petroleum-based lubricants and are widely used in general industrial machinery.

The double-lip construction typically combines a spring-loaded primary sealing lip with an auxiliary dust lip. The primary lip helps prevent lubricant leakage along the rotating shaft, while the secondary lip provides additional protection against external contamination.

Features & Advantages

• Double Lip Protection: Combines lubricant retention with an additional barrier against dust and dirt.

• Good Oil Resistance: NBR is compatible with many mineral oils, greases and petroleum-based hydraulic fluids.

• Spring-Loaded Primary Lip: A garter spring helps maintain consistent sealing contact with the rotating shaft.

• Metal-Reinforced Construction: Provides structural support and helps maintain a secure fit within the housing.

• Cost-Effective Sealing: Suitable for a wide range of standard industrial applications requiring reliable oil sealing.

• Standard & Custom Sizes: Available in various dimensions and configurations for OEM and replacement applications.

Seal Construction

NBR double lip oil seals commonly use a metal-reinforced body with a rubber-covered outer diameter. The primary sealing lip is typically fitted with a garter spring, while the auxiliary dust lip may be contacting or non-contacting depending on the seal design.

Common configurations include TC-type seals with a rubber-covered metal case and selected metal-cased designs. The sealing arrangement and housing fit should be matched to the equipment requirements.

Operating Conditions

NBR is commonly used for applications involving mineral oils, lubricating greases and many petroleum-based hydraulic fluids.

Standard NBR rotary shaft seals typically operate within a temperature range of approximately -40°C to +100°C, depending on the rubber compound and operating medium.

Operating speed and pressure capability depend on shaft diameter, lubrication, sealing lip design and installation conditions. Standard double lip oil seals are primarily intended for low-pressure applications.

Typical Applications

NBR double lip rotary shaft oil seals are widely used in:

• Industrial gearboxes and speed reducers

• Electric motors and drive assemblies

• Pumps and general industrial machinery

• Agricultural and construction equipment

• Automotive transmission components

• Bearing housings and power transmission systems

• Maintenance and replacement applications

Standard & Custom Supply

CORA SEALS supplies NBR double lip rotary shaft oil seals for industrial distributors, equipment manufacturers, maintenance contractors and aftermarket replacement requirements.

Standard metric and custom sizes can be sourced with different outer case designs, sealing lip configurations and spring materials.

For quotations, please provide the shaft diameter, housing bore diameter, seal width, required quantity and preferred seal design. Existing part numbers, drawings or samples can also help identify suitable replacements.

For special operating conditions, please include the lubricant type, temperature, shaft speed, pressure and environmental requirements.