WBT NBR OS-A10 25x50x7 Oil Seal

WBT Oil Seal 25x50x7 mm NBR

Description

This is a pack of two WBT OS-A10 oil seals, designed for sealing rotating shafts in various industrial applications. Manufactured from high-grade NBR (Nitrile Butadiene Rubber), these seals offer excellent resistance to oils, greases, and other common lubricants. The 25x50x7 mm dimensions make them suitable for a wide range of standard machinery, ensuring reliable performance and longevity.

Specifications

• Manufacturer: WBT (World Bearing Trade)
• Type: OS-A10
• Inner Diameter: 25 mm
• Outer Diameter: 50 mm
• Width: 7 mm
• Material: NBR (Nitrile Butadiene Rubber)
• Quantity: 2 pieces per package

Label Info

• Part Number: 21039029
• Type: OS-A10
• Dimensions (Afmeting): 25 x 50 x 7

Application

These oil seals are ideal for use in gearboxes, pumps, motors, and other machinery where preventing lubricant leakage and excluding contaminants is critical. The NBR material makes them suitable for applications with temperatures ranging from -30 deg C to +100 deg C.

Country of Origin

WBT is a brand based in the Netherlands. The specific country of manufacture for this component is not specified on the packaging.

CO2 Impact

Choosing this pre-owned set of two oil seals over new ones saves an estimated 0.22 kg of CO2. This saving is comparable to the emissions from driving a standard car for more than 1 kilometer.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is NBR material suitable for?

NBR (Nitrile Butadiene Rubber) is an elastomer known for its excellent resistance to petroleum-based oils, fuels, greases, and water. It is not recommended for applications involving high levels of ozone, ketones, or chlorinated hydrocarbons.

What does the ‘A’ in the OS-A10 type designation signify?

In standard seal nomenclature, ‘Type A’ typically refers to a design with a metal case that is fully encased in rubber and features a single sealing lip with a garter spring. This design provides effective sealing and good static sealing on the outer diameter.

Can this seal be used in high-pressure applications?

Standard single-lip oil seals like the OS-A10 are generally designed for low-pressure applications, typically up to 0.5 bar (7 psi). For higher pressures, a pressure-resistant seal design or additional support rings may be required.

Last Update: Friday, March 13, 2026

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