NSK 6308DDUCM NS7S

NSK 6308DDUCM Deep Groove Ball Bearing

Description

The NSK 6308DDUCM is a single-row deep groove ball bearing engineered for high performance and reliability. It features double-sided contact seals (DDU) for superior protection against contaminants and excellent grease retention. The CM radial internal clearance makes it an ideal choice for electric motor applications, where low noise and vibration are critical. Manufactured in Japan, this bearing represents NSK’s commitment to quality and precision engineering.

Specifications

• Manufacturer: NSK
• Type: 6308DDUCM
• Category: Deep Groove Ball Bearing
• Bore Diameter (d): 40 mm
• Outer Diameter (D): 90 mm
• Width (B): 23 mm
• Seals: DDU – Contact seals on both sides
• Internal Clearance: CM – For electric motor applications
• Material: Bearing Steel

Label Info

• Model: 6308DDUCM
• Additional Codes: NS7S, 308

Application

This bearing is widely used in applications requiring high rotational speeds and durability, such as electric motors, pumps, gearboxes, and general industrial machinery. The DDU seals make it suitable for environments with moderate contamination.

Country of Origin

This product is proudly made in Japan by NSK Ltd.

CO2 Impact

Choosing this reused component prevents the emission of approximately 1.24 kg of CO2, which is equivalent to the savings from not manufacturing a new steel part of this size. This contributes positively to a circular economy.

Availability

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

FAQ

What is the difference between NSK’s DDU seal and a ZZ shield?

The DDU designation indicates a double-sided contact rubber seal. This type of seal makes light contact with the inner ring, offering superior protection against dust, moisture, and other contaminants, while also retaining grease effectively. In contrast, a ZZ shield is a non-contact metal shield, which creates a small gap with the inner ring. ZZ shields are better for higher speed applications as they generate less friction, but they offer less protection against fine particles and liquids compared to DDU seals.

What does the ‘CM’ suffix signify for this 6308DDUCM bearing?

The ‘CM’ suffix on an NSK bearing denotes a special radial internal clearance specifically for electric motor applications. This clearance range is tighter than C3 but greater than Normal (CN). It is designed to reduce noise and vibration in electric motors, leading to quieter and smoother operation.

Can I use a standard grease to relubricate this bearing?

The NSK 6308DDUCM bearing is a sealed-for-life unit and is pre-lubricated at the factory with a high-quality grease. The DDU seals are not designed to be removed for relubrication without potentially damaging them. Attempting to relubricate this bearing is not recommended and could lead to premature failure. It should be used as supplied.

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Laatst bijgewerkt: Friday, March 13, 2026