NSK 6303+ZZCM NS7S

NSK 6303+ZZCM NS7S Deep Groove Ball Bearing

Description

This NSK 6303+ZZCM NS7S is a high-quality deep groove ball bearing from the NSKHPS (High Performance Standard) series. It is engineered for superior performance, long life, and reliability in demanding applications. With its ZZ metal shields and special CM clearance, it is ideal for use in electric motors and other machinery where low vibration and noise levels are critical.

Specifications

• Bore Diameter: 17 mm
• Outer Diameter: 47 mm
• Width: 14 mm
• Shields: ZZ (Metal shield on both sides)
• Clearance: CM (Special clearance for electric motors)
• Series: NSKHPS
• Lubrication: Pre-lubricated with NS7S grease

Label Info

• Manufacturer: NSK
• Type Number: 6303+ZZCM NS7S

Application

Ideal for use in electric motors, pumps, fans, and general industrial machinery that requires high reliability and long service life.

Country of Origin

Japan

CO2 Impact

By purchasing this pre-owned bearing, you are contributing to a circular economy and avoiding the CO2 emissions of new production, estimated at 0.21 kg.

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 significance of the ‘CM’ clearance designation on this NSK 6303 bearing?

The ‘CM’ designation indicates a specific radial internal clearance range that is greater than ‘CN’ (Normal) clearance. This clearance is specifically optimized for small electric motors to accommodate thermal expansion of the shaft and housing, ensuring low noise and vibration levels during operation.

What are the benefits of the ‘ZZ’ shields compared to ‘2RS’ seals?

The ‘ZZ’ suffix means the bearing is fitted with non-contact metal shields on both sides. These are excellent for high-speed applications as they generate no friction. They effectively retain grease and protect against larger solid contaminants. In contrast, ‘2RS’ seals are made of rubber and make contact with the inner ring, providing better protection against fine dust and moisture but creating some friction, which can limit the maximum speed.

The bearing is marked ‘NS7S’. What does this mean for its application?

‘NS7S’ refers to the type of grease pre-lubricated in the bearing. It is an NSK proprietary grease, typically a urea-based lubricant known for its excellent heat resistance and long service life. This makes the bearing suitable for applications with moderate to high operating temperatures where relubrication is difficult or not planned.

Last Update: Friday, March 13, 2026

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