NSK 6308DDUCM E NS7S5

NSK Deep Groove Ball Bearing 40x90x23mm 6308DDUCM

Description

This is a single-row deep groove ball bearing, model 6308DDUCM, manufactured by NSK. It is designed for high-speed operation and can support both radial and axial loads. The DDU designation indicates that the bearing is equipped with contact seals on both sides, providing excellent protection against dust and contaminants while retaining lubricant. The CM clearance makes it particularly suitable for electric motor applications, ensuring optimal performance and longevity.

Specifications

• Bore Diameter: 40 mm
• Outer Diameter: 90 mm
• Width: 23 mm
• Seal Type: DDU (Contact Seals on Both Sides)
• Internal Clearance: CM (Electric Motor Clearance)
• Grease: NS7S5
• Limiting Speed (Grease): 5300 rpm
• Basic Dynamic Load Rating: 41.0 kN
• Basic Static Load Rating: 24.0 kN

Label Info

• Manufacturer: NSK
• Type: 6308DDUCM
• Part Number Suffixes: E NS7S5

Application

This bearing is versatile and commonly used in applications such as electric motors, pumps, gearboxes, automotive components, and general industrial machinery where reliable performance and protection against contamination are required.

Country of Origin

Made in England (United Kingdom) by NSK Bearings Europe Ltd.

CO2 Impact

By purchasing this reconditioned bearing, you are saving approximately 1.22 kg of CO2. This saving is equivalent to the emissions of driving a car for more than 6 kilometers, contributing to a more sustainable industrial practice.

Availability

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

FAQ

What do the suffixes DDU and CM mean on the NSK 6308DDUCM?

The ‘DDU’ suffix indicates that the bearing has contact rubber seals on both sides, offering superior protection against contamination and better lubricant retention compared to non-contact seals. The ‘CM’ suffix denotes a specific radial internal clearance designed for electric motor applications, which helps to reduce noise and vibration.

Is the NS7S5 grease suitable for high-temperature applications?

The NS7S5 designation refers to NSK’s proprietary NS7 grease with a specific fill level. It is a high-quality, wide-temperature range grease suitable for many standard applications. However, for continuous operation at very high temperatures (above 120 deg C), it is recommended to consult the NSK technical datasheet to confirm suitability or consider a bearing with a different grease type.

What is the correct installation procedure to avoid damaging the seals?

When installing a sealed bearing like the 6308DDUCM, pressure should only be applied to the ring being fitted. For a shaft fit, press only on the inner ring. For a housing fit, press only on the outer ring. Never apply pressure through the balls, as this can damage the raceways and seals. Using proper bearing fitting tools is highly recommended.

spareparts2day is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026