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Quick Answer: What This Guide Covers?
A self-aligning ball bearing cross reference is based on shared ISO boundary dimensions rather than identical part numbers. SKF, FAG, INA and NTN-SNR all use series codes 12, 13, 22 and 23, a bore code multiplied by five for sizes above 20 mm, and common suffixes such as K for a tapered bore. Exact stock availability and full part-level equivalence should always be confirmed through the KG International e-catalog or sales team before ordering.
A self-aligning ball bearing cross reference helps distributors, procurement teams and maintenance engineers match equivalent bearing designations across leading brands such as SKF, FAG, INA and NTN-SNR. Although each manufacturer prints its own prefix on the bearing face, most self-aligning ball bearings follow the same ISO series structure, so once you understand the series code, bore code and suffix system, cross-brand comparison becomes straightforward.
KG International FZCO operates a 250,000 plus sq ft distribution hub in Jebel Ali Free Zone, Dubai, stocking bearings across multiple brands for buyers in 50+ countries. This guide is built for procurement heads, distributors and maintenance engineers who need a reliable, standards based reference before requesting a quote.
What Is a Self Aligning Ball Bearing?
A self-aligning ball bearing has an inner ring with two ball raceways and an outer ring with a single spherical raceway centred on the bearing axis. This spherical outer raceway lets the bearing automatically adjust to small amounts of shaft deflection or housing misalignment. Self-aligning ball bearings carry radial loads well but are not designed for heavy axial loads, and they are generally specified for low to medium speed applications.
Why Do Bearing Brands Use Different Prefixes for the Same Bearing?
Bearing boundary dimensions such as bore, outer diameter and width are standardised under ISO 15, so a given series and bore size occupies the same physical envelope no matter which brand produces it. What differs between SKF, FAG, INA and NTN-SNR is internal design detail such as cage material, clearance class, seal type and any brand-specific engineering refinement. This is why the base series and bore numbers line up closely across brands, while suffixes and prefixes can vary.
How Does the ISO Series Numbering System Work?
Across SKF, FAG, INA and NTN-SNR, self-aligning ball bearings are grouped into four common series codes that describe relative width for a given bore size.
How Do You Decode the Bore Size in a Self Aligning Ball Bearing Number?
For bore sizes of 20 mm and above, the two digit bore code is multiplied by five to give the bore diameter in millimetres. Three special codes are used below 20 mm.
Example: a bearing marked 1206 is read as series 12 (standard width) plus bore code 06, giving a 30 mm bore. The equivalent logic applies whether the bearing is stamped by SKF, FAG, INA or NTN-SNR, which is the foundation of any reliable self-aligning ball bearing cross reference.
What Do the K, C3 and Cage Suffixes Mean Across SKF, FAG, INA and NTN-SNR?
Once the series and bore are matched, suffixes describe bore type, internal clearance and cage material. These suffix conventions are broadly shared, with only minor labelling differences between manufacturers.
Because exact part level equivalence also depends on load rating, precision class and stock availability, always confirm the final self-aligning ball bearing cross reference through the KG International e-catalog or sales team before ordering. Cross-reference guidance in this article is provided for identification and sourcing support only, and final fitment should be confirmed using official part numbers and application data.
Self Aligning Ball Bearing Cross Reference Table at Series Level
The table below shows how the same series and bore combination lines up across brands at a structural level. It is a starting point for sourcing conversations, not a substitute for an official part number check.
SKF, FAG, INA and NTN-SNR each use this same base numbering for the corresponding series and bore, then apply their own suffixes for bore type, clearance and cage.
Which Industries Commonly Specify Self Aligning Ball Bearings?
Self-aligning ball bearings are commonly specified in fans and blowers, textile spindles, conveyors and agricultural attachments, where shaft misalignment is more likely and running accuracy still matters. Within KG International’s served industries, this includes agriculture and farm equipment, crusher and cement operations, and steel and metallurgy plants. Explore the full range on the KG International applications hub.
How Does Lubrication Affect Self Aligning Ball Bearing Performance?
Correct lubrication supports smoother self-alignment and helps reduce friction related wear, though performance still depends on correct selection, load, speed and operating temperature. For general purpose bearing lubrication support, review KG Ultra Grease and speak with the KG International team to confirm the right grease for your specific application.
How Do Self Aligning Ball Bearings Compare With Spherical Roller Bearings?
Self-aligning ball bearings and spherical roller bearings both compensate for misalignment, but spherical roller bearings generally support higher radial and axial loads at higher speeds. Buyers weighing load capacity against speed and cost should review both product families before finalising a specification.
How Can You Source Verified Self Aligning Ball Bearings Through KG International?
KG International maintains stock across the bearings and housings range, with brands available through KG International including SKF, FAG, INA and NTN-SNR alongside the KG Bearings own brand portfolio. Distributors, procurement teams and maintenance engineers can confirm the exact cross reference, stock position and lead time before committing to an order.
Frequently Asked Questions
Disclaimers
Trademark Disclaimer: SKF, FAG, INA and NTN-SNR are trademarks of their respective owners. Their use in this article is for identification, cross-reference and sourcing purposes only and does not imply ownership, endorsement, authorised distributor status or affiliation unless explicitly stated by KG International.
