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Inch-series thin section ball bearing, 4-1/4 x 5-1/4 x 1/2 in square cross-section, open, outer-ring-guided phenolic cage, Aeroshell 7 grease.
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| MFR / Brand | FAG |
|---|---|
| MPN | L15TA404 |
| Model | L15TA 404 KD42ARO |
| Bearing Type | Thin Section Ball Bearing |
| ID | 4-1/4 in (107.95 mm) |
| OD | 5-1/4 in (5.250 in, 133.35 mm) |
| Width | 1/2 in (12.70 mm) |
| Condition | New |
|---|---|
| Base Number | 404 |
| Industry Terms | Thin section ball bearing; thin ring bearing; slim section bearing; large bore thin bearing; aviation grease bearing |
| Application Types | Gimbals and gun mounts; radar and antenna platforms; robotic joints; medical scanners; actuator rings |
| Overall Width | 1/2 in (0.500 in, 12.70 mm) |
| Bore Shaft Size | 4-1/4 in (4.250 in, 107.95 mm) |
| Mpn Variants | L15TA404; L15 TA 404; L15TA 404; 404-TA-L15; L15TA404 KD42ARO; KD-42; KD42; ARO; CONS |
| Additional Attributes | Square cross-section: radial section (OD - bore)/2 = 0.500 in equals the 0.500 in width; section 1/2 in x 1/2 in |
| Cage Type | Outer-ring guided, machined |
| Rolling Elements | Steel balls |
| Cage Material | Textile-laminated phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight, cylindrical |
| Lubricant | Shell Aeroshell 7 grease, MIL-G-23827 (L15) |
| Harmonization Code | 8482.10.50 |
| Design Units | Inch |
| Bearing Material | Bearing steel |
| Part Number | L15TA404 |
| Cross Reference 1 | KD-42 (carton cross designation) |
|---|---|
| Cross Reference 2 | Kaydon Reali-Slim bore code 042 (related size, same 4.250 in bore thin-section envelope) |
| Cross Reference 3 | FAG 404-TA (related size, same bearing without the L15 grease specification) |
FAG L15TA404 thin section ball bearing, inch series. Bore: 4-1/4 in (4.250 in, 107.95 mm). Outside diameter: 5-1/4 in (5.250 in, 133.35 mm). Width: 1/2 in (0.500 in, 12.70 mm). Open on both faces. Country of origin: Germany.
404 — the basic bearing number. TA — Cage: textile-laminated phenolic retainer, outer-ring guided. L15 — Lubricant: Shell Aeroshell 7 grease to MIL-G-23827. Searchable forms: L15TA404, L15 TA 404, L15TA 404, 404-TA-L15. The carton also carries the cross designations KD-42 and ARO.
The cross-section is square: (5.250 in − 4.250 in) / 2 = 0.500 in, which equals the width. That square 1/2 in x 1/2 in section on a 4-1/4 in bore is the defining thin-section geometry, and it is what lets a large-diameter bearing fit a shallow housing pocket and a light rotating structure.
A textile-laminated phenolic cage is light, self-lubricating and runs quietly, and outer-ring-guided location keeps the cage stable under the low radial loads and oscillating duty that thin-section bearings usually see. The Aeroshell 7 grease charge is a wide-temperature aviation-specification grease, which places this bearing in gimbal, actuator and instrument-platform service rather than general industrial duty.
One piece.
Bore form: straight, 4.250 in. Thin-section rings are flexible by design, so both the shaft seat and the housing bore carry the ring roundness; a light press on a full-contact seat holds the raceway geometry.
The carton cross designations KD-42 and ARO are recorded as searchable variants. Kaydon Reali-Slim bore code 042 is the same 4.250 in bore on a thin-section envelope. FAG 404-TA is the same bearing without the L15 grease specification.
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