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The SKF 6205ZZ bearing is a deep groove ball bearing with the following specifications:
Description:
Manufacturer: SKF (Svenska Kullagerfabriken AB)
Bearing Number: 6205ZZ
Key Features:
Type: Deep groove ball bearing
Shield Type: ZZ means it has metal shields on both sides (non-contact type). These protect the bearing from dust and dirt but don’t provide a full seal like rubber-sealed ones.
Design: Single row
Material: Typically made of chrome steel (bearing steel)
Dimensions:
Inner Diameter (ID): 25 mm
Outer Diameter (OD): 52 mm
Width: 15 mm
Characteristics:
Suitable for high-speed applications
Commonly used in electric motors, automotive, household appliances, and machinery
Pre-lubricated with grease, maintenance-free under normal conditions

The SKF 6205-2RS is a deep groove ball bearing with the following specifications:
Specifications:
Brand: SKF
Model: 6205-2RS
Seal Type: 2RS (Rubber Sealed on Both Sides)
Inner Diameter (ID): 25 mm
Outer Diameter (OD): 52 mm
Width: 15 mm
Material: Chrome Steel
Lubrication: Pre-lubricated with grease
Application: Used in motors, pumps, gearboxes, and other rotating machinery

SKF is a globally recognized leader in bearing technology, offering a comprehensive range of high-performance bearings designed to meet the diverse needs of various industries.

The NBC 6220 bearing is a single-row deep groove ball bearing manufactured by National Engineering Industries (NBC), a leading bearing manufacturer in India. Here's a description of its key characteristics and specifications:
General Description:
* Type: Single Row Deep Groove Ball Bearing
* Deep groove ball bearings are versatile and the most common type of rolling bearing.
* They are designed to primarily support radial loads but can also accommodate axial loads in both directions.
* This type of bearing offers low friction and is suitable for high-speed applications.
* It has a simple and robust design, is easy to mount, and requires minimal maintenance.
* NBC bearings are known for their quality and reliability.
Dimensions:
* Bore Diameter (d): 100 mm
* Outer Diameter (D): 180 mm
* Width (B): 34 mm
Performance (Typical Values - may vary slightly between manufacturers or specific variants):
* Basic Dynamic Load Rating (Cr): Approximately 122 - 130 kN
* Basic Static Load Rating (C0r): Approximately 92 - 93 kN
* Fatigue Load Limit (Pu): Approximately 3.35 - 6.3 kN
* Limiting Speed (Grease): Approximately 3500 - 4320 rpm
* Limiting Speed (Oil): Approximately 4200 - not always specified, but higher than grease lubrication.
* Reference Speed: Approximately 4800 - 7500 rpm
Materials and Features:
* Bearing Steel: Typically made from high carbon chromium bearing steel for durability and high load capacity.
* Cage Material: Usually features a standard sheet metal cage, but other materials like brass (indicated by suffix 'M' in some variations like 6220-M) may be used.
* Seals/Shields: The basic 6220 is an open bearing (no seals or shields). However, variations exist:
   * 6220Z: Single shield on one side.
   * 6220ZZ (or 2Z): Metal shields on both sides for dust and contaminant protection.
   * 6220RS, 6220 2RS, 6220LLU, 6220DDU: Rubber seals on one or both sides for better protection against moisture and contaminants.
* Internal Clearance: Usually has a Normal (CN) radial internal clearance. Other clearances like C3 (larger than normal) might be available for specific operating conditions.
* Lubrication: Typically supplied without lubricant, requiring application of suitable grease or oil.
Applications:
NBC 6220 deep groove ball bearings are used in a wide array of applications, including:
* Automotive industry
* Electric motors
* Agricultural machinery
* Household appliances
* Industrial machinery
* Gearboxes
* Pumps
* And many other general industrial applications
How to Identify Specific Variations:
The suffix after the 6220 designation indicates specific features, such as:
* ZZ or 2Z: Double metal shields
* RS, 2RS, LLU, DDU: Rubber seals
* C3: Increased radial internal clearance
* M: Brass cage
* K: Tapered bore (less common for this size in deep groove)