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:
7 in stock
FAG thin-section angular contact ball bearing, 4.250 x 4.750 x 0.250 in (1/4 x 1/4 in square section), open, German-made.
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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 | 4.75 in |
| Width | 0.25 in |
| Condition | New |
|---|---|
| Base Number | L15QA404 |
| Industry Terms | thin section bearing; thin ring bearing; slim bearing; angular contact thin section; reali-slim type bearing; hollow shaft bearing; robot joint bearing; rotary table bearing |
| Common Misspellings | L15QA404 YP; L15QA-404YP; L15Q A404YP; L15QA4O4YP; FAG L15QA404; Schaeffler L15QA404YP |
| Application Types | Robotic joints and rotary axes; index and rotary tables; medical imaging gantries; optical and radar mounts; semiconductor handling equipment; aerospace actuation |
| Bore Shaft Size | 4.2500 in (107.95 mm) |
| Mpn Variants | L15QA404YP; L15QA404-YP; L15QA404 YP; L15QA404 |
| Additional Attributes | Cross-section: 1/4 x 1/4 in (6.35 x 6.35 mm) square - characteristic thin-section geometry; Radial section thickness: 0.250 in (6.35 mm); Country of manufacture: Germany; Mounting note: thin-section rings are flexible - seats must be round, flat and evenly clamped; Related but different: L15RA400YP is the 5/16 x 5/16 in section; Not published by the manufacturer: contact angle, dynamic and static load ratings, limiting speed, weight |
| Design Units | Imperial |
| Part Number | L15QA404YP |
| Cross Reference 1 | FAG L15QA404YP |
|---|---|
| Cross Reference 2 | L15QA404-YP |
The FAG L15QA404YP is a thin-section angular contact ball bearing in the imperial 4.250 in bore x 4.750 in outside diameter x 0.250 in width envelope – a 1/4 x 1/4 in square cross-section. German-manufactured.
Thin-section bearings hold that small ring section constant regardless of bore, so a large-diameter bearing stays shallow and light, which is why they dominate designs where a rotating joint has to pass a cable, shaft or optical path through the middle. The angular contact geometry carries combined radial and axial load and can be preloaded for rigidity. Typical duty is robotic joints and rotary axes, index and rotary tables, medical imaging gantries, optical and radar mounts, and semiconductor handling.
Thin-section rings are comparatively flexible, so seat roundness, flatness and even clamping matter considerably more than on a conventional bearing of the same bore.
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