SKF double row cylindrical roller bearing type suffix explanation

**SKF Double Row Cylindrical Roller Bearing Type Suffix Explanation** Home > Bearing Knowledge > SKF Double Row Cylindrical Roller Bearing Type Suffix Explanation Source: China Bearing Network | Date: January 5, 2014 --- SKF double row cylindrical roller bearings are widely used in industrial applications due to their high load capacity and durability. Understanding the suffixes of these bearings is essential for selecting the right type for specific applications. Here's a detailed explanation of common SKF bearing suffixes: - **B**: Indicates the bearing has a double-row cage with two separate cages. - **BK**: A double-cage design with a steel cage and an inner ring. - **CN**: Refers to the normal radial internal clearance. It is typically used in combination with other suffixes to indicate the size of the clearance. - **H**: Represents a reduced clearance, corresponding to the upper half of the standard clearance range. - **L**: Indicates a smaller clearance, matching the lower half of the standard clearance range. - **M**: Refers to a medium clearance, falling between the upper and lower halves of the standard range. - **P**: Suggests a clearance that is slightly larger than the upper half of the standard range. These suffixes are often combined with clearance levels such as **C2**, **C3**, **C4**, and **C5**: - **C1**: Clearance less than C2 - **C2**: Standard clearance - **C3**: Clearance greater than normal - **C4**: Greater clearance than C3 - **C5**: Greater clearance than C4 Other common suffixes include: - **F**: Machined steel cage with a central roller. - **FB**: Steel cage with an outer ring as the center. - **HA1**: Inner ring with a hardened surface. - **HA2**: Hardened outer ring. - **HA4**: Hardened rollers with hardened inner and outer rings. - **HB1**: Bainite-hardened inner and outer rings. - **HB2**: Bainite-hardened outer ring. - **HB3**: Bainite-hardened inner ring. - **K**: Tapered bore, with a 1:12 taper. - **KTN9**: Tapered bore with TN9 cage. - **K30**: Tapered bore with a 1:30 taper. - **M**: Machined copper cage with intermediate parts. - **P4**: High precision level, meeting ISO 4 standards. - **P5**: Meets ISO 5 standards. - **P6**: Meets ISO 6 standards. - **SP**: Special precision grade for machine tool bearings, similar to P5 in accuracy and P4 in rotation. - **SPCN**: SP + CN (special precision with normal clearance). - **SPC2**: SP + C2 (special precision with C2 clearance). - **TN9**: Molded glass fiber reinforced nylon 66 cage. - **UP**: Ultra-precision grade for machine tool bearings, exceeding P4 in rotation accuracy. - **VE900**: General specification designation. - **W33**: Outer ring with annular groove and three oil holes. - **W33X**: Outer ring with annular groove and six oil holes. --- **Related Bearing Knowledge** - The concept of double-row tapered roller bearings - Stamping bearing techniques - Painting skills for car bearings - Methods for protecting bearings - INA bearing oil stains - SKF bearing hydrostatic bearing saver This article is sourced from China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: NTN Bearing Work Next: Rolling Bearing Marking Information
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