Timken vs. SKF Bearings: The Difference Between Tier-1 Bearing Brands
When sourcing a replacement bearing, you will often find both Timken and SKF options for
Availability:
6 in stock
FAG thin-section angular contact ball bearing, 4.000 x 4.625 x 0.3125 in (5/16 x 5/16 in square section), open, German-made.
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6 in stock
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| MFR / Brand | FAG |
|---|---|
| MPN | L15QA404YP |
| Model | L15QA408 YP / KA042ARO / CSEA042 / NBA10706 |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 4.25 in |
| OD | 4.625 in |
| Width | 0.3125 in |
| Condition | New |
|---|---|
| Base Number | L15RA400 |
| Industry Terms | thin section bearing; thin ring bearing; slim bearing; angular contact thin section; reali-slim type bearing; large bore shallow section bearing; robot joint bearing |
| Common Misspellings | L15RA400 YP; L15RA-400YP; L15R A400YP; L15RA4OOYP; FAG L15RA400; Schaeffler L15RA400YP |
| Application Types | Robotic joints and rotary axes; rotary index tables; medical imaging gantries; optical and radar mounts; packaging machinery; semiconductor handling equipment |
| Bore Shaft Size | 4.0000 in (101.60 mm) |
| Mpn Variants | L15RA400YP; L15RA400-YP; L15RA400 YP; L15RA400 |
| Additional Attributes | Cross-section: 5/16 x 5/16 in (7.94 x 7.94 mm) square - characteristic thin-section geometry; Radial section thickness: 0.3125 in (7.94 mm); Country of manufacture: Germany; Mounting note: thin-section rings are flexible - housing and shaft must be round, square and fully supported; Not published by the manufacturer: contact angle, dynamic and static load ratings, limiting speed, weight |
| Design Units | Imperial |
| Part Number | L15RA400YP |
| Cross Reference 1 | FAG L15RA400YP |
|---|---|
| Cross Reference 2 | L15RA400-YP |
The FAG L15RA400YP is a thin-section angular contact ball bearing in the imperial 4.000 in bore x 4.625 in outside diameter x 0.3125 in width envelope. German-manufactured.
That works out to a 5/16 x 5/16 in square cross-section, the defining feature of thin-section bearings: the ring section stays constant as the bore grows, so a large-diameter bearing stays light and shallow. Angular contact geometry lets it carry combined radial and axial load, and the thin section suits designs where the bearing has to fit a tight radial envelope – robot joints, rotary tables, medical imaging gantries, optical and radar mounts, and machine-tool indexers.
Because thin-section rings are relatively flexible, housing and shaft roundness and clamping practice matter more than on a conventional bearing; mount against a flat, square, fully supported seat.
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