NSK 6309DDUCM NS7S5

NSK Deep Groove Ball Bearing 45x100x25mm 6309DDUCM NS7S5

Description

This is a high-performance deep groove ball bearing from NSK, part number 6309DDUCM NS7S5. Engineered for demanding applications, it features dual contact seals for superior protection against dust and moisture, extending its service life. The CM clearance is specifically designed for electric motor applications, ensuring quiet operation and reduced vibration. This bearing is a versatile and reliable choice for various industrial machinery.

Specifications

• Manufacturer: NSK
• Part Number: 6309DDUCM NS7S5
• Type: Single-Row Deep Groove Ball Bearing
• Bore Diameter (d): 45 mm
• Outer Diameter (D): 100 mm
• Width (B): 25 mm
• Seals: DDU (Contact Seals on Both Sides)
• Clearance: CM (For Electric Motor Applications)
• Grease: NS7S5

Label Info

• Brand: NSK Bearings
• Model: 6309DDUCM
• Suffix: E NS7S5

Application

Ideal for electric motors, pumps, gearboxes, conveyors, and other general industrial machinery where reliability and protection from contaminants are critical.

Country of Origin

Made in England.

CO2 Impact

Choosing this surplus bearing over a new one saves approximately 1.66 kg of CO2. This saving is equivalent to the emissions from driving a standard car for over 8 km.

Availability

In stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the significance of the ‘DDU’ and ‘CM’ suffixes on the NSK 6309 bearing?

‘DDU’ indicates that the bearing is fitted with contact-type rubber seals on both sides, providing excellent protection against contamination and retaining grease. ‘CM’ specifies a particular radial internal clearance suitable for electric motor applications, which helps to reduce noise and vibration levels during operation.

Is the NS7S5 grease suitable for high-temperature applications?

NSK’s NS7S grease is a polyurea-based grease known for its excellent durability and wide operating temperature range, typically from -40 deg C to +150 deg C. It is well-suited for many industrial applications, but for continuous operation at the extreme upper end of this range, it’s always best to consult the manufacturer’s specific guidelines.

Can this 6309DDUCM bearing be used as a direct replacement for a standard 6309-2RS bearing?

Yes, in most cases. A ‘6309-2RS’ (or ‘2RSR’) is a common designation for a bearing of the same dimensions with rubber seals on both sides. The NSK ‘DDU’ is functionally equivalent to ‘2RS’. The ‘CM’ clearance is a benefit in many applications, especially motors, so it can often replace a bearing with ‘standard’ (CN) clearance without issue. However, for precision applications, always verify the required clearance.

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Last Update: Friday, March 13, 2026