The KA040XP0 thin section bearing reference identifies a 4-inch bore, open four-point contact design. LYDL lists the corresponding Type X size as LYDL-A040, with nominal dimensions of 4 × 4.5 × 0.25 in (101.6 × 114.3 × 6.35 mm). Send the reference, quantity and application to request a quotation.
KA040XP0 is a Kaydon part number used here for dimensional and structural comparison. It is not a LYDL order code or a claim of authorized affiliation. Specify “LYDL-A040, open Type X, KA040XP0 reference” in an inquiry because the LYDL-A040 shorthand also appears in other contact-type tables.
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| Parameter | Symbol | Inches | Millimeters |
|---|---|---|---|
| Bore diameter | d | 4.000 | 101.600 |
| Outside diameter | D | 4.500 | 114.300 |
| Axial width | B | 0.250 | 6.350 |
| Radial section, (D − d) / 2 | — | 0.250 | 6.350 |
Inches are the original nominal units; millimeter values use exactly 25.4 mm per inch. LYDL’s open Type X series table and Kaydon’s KA reference dimensions agree on this envelope. These are nominal dimensions, not tolerance limits or an approved installation drawing.
The reference ratings below follow the Kaydon Reali-Slim open Type X catalog entry for the equivalent KA040XP0 designation. Use them for first-pass sizing; confirm final selection with LYDL against the actual duty cycle, fits, lubrication and operating temperature of your mechanism.
| Parameter | Symbol | Reference value | SI equivalent |
|---|---|---|---|
| Dynamic radial load rating | Cr | 756 lbf | 3.4 kN |
| Static radial load rating | C0r | 1,290 lbf | 5.7 kN |
| Dynamic thrust load rating | Ca | 1,210 lbf | 5.4 kN |
| Static thrust load rating | C0a | 3,220 lbf | 14.3 kN |
| Dynamic moment rating | M | 1,205 in-lbf | 136 N·m |
| Static moment rating | M0 | 2,740 in-lbf | 310 N·m |
| Approximate mass | m | 0.19 lb | 0.086 kg |
Reference values per the Kaydon Reali-Slim catalog for the equivalent open Type X part number. LYDL manufactures to its own internal specifications, so treat these figures as comparison inputs rather than guaranteed ratings, and verify critical selections with our engineering team.
Type X identifies four-point contact geometry. Kaydon describes this reference family for radial, bidirectional axial and moment loading, subject to load analysis and mounting conditions. This structure is relevant when an assembly must react to more than one load direction; it does not establish an allowable load for a particular LYDL configuration.
The KA reference family uses a constant 0.25 × 0.25 in section across its listed bore sizes. This page does not transfer Kaydon load ratings, internal components or suffix-specific specifications to LYDL supply. Material, cage, clearance or preload, accuracy, lubricant and operating limits belong in the agreed quotation and drawing.
For a different contact arrangement, compare LYDL’s open Type C radial-contact series and open Type A angular-contact series. A matching external envelope alone does not establish interchangeability.
Different manufacturers use different identifiers for this thin section bearing envelope. The references below share a nominal 4.000 × 4.500 × 0.250 in size (101.6 × 114.3 × 6.35 mm) and four-point contact structure in their cited documents. They are starting points for a specification review, not an unconditional interchangeability list.
| Brand | Published designation | Reference scope |
|---|---|---|
| Kaydon | KA040XP0 | Reali-Slim KA, open Type X |
| Silverthin | SA040XP0 | SA, inch open Type X |
| INA / Schaeffler | CSXA040 | CSX four-point contact; published catalogue reference |
| LYDL | LYDL-A040, open Type X | LYDL series-table designation; quote with the complete reference |
In Kaydon’s coding system, K identifies the open bearing material/sealing category, A the quarter-inch section, 040 the 4-inch bore, and X four-point contact. P identifies a separator design and the final 0 identifies Kaydon’s precision class. Read P and 0 separately; they do not establish an ISO P0 accuracy claim for LYDL.
Silverthin uses SA040XP0 for its corresponding reference size. INA uses the different CSXA040 naming family in the cited catalogue. For an existing machine, retain every suffix on its original label or drawing and check the manufacturer’s current specification.
Before replacement, compare the complete drawing, load basis, fits, clearance or preload, accuracy, lubrication and sealing. Matching dimensions do not establish matching performance or current availability. These manufacturers’ names identify reference products; they are not LYDL part numbers or evidence of a supply or authorization relationship.
Start with the model reference, quantity, application and delivery destination; complete engineering documentation is not required for an initial inquiry. For a drawing review, include available shaft and housing information, the load directions and any clearance, preload or runout requirements.
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The 101.6 mm nominal opening and 6.35 mm section suit semiconductor wafer-handling and inspection stages, machine-tool rotary tables and indexing heads, lab-automation and packaging carousels, camera and payload turrets, and hollow-shaft servo arrangements that combine a usable central passage with moderate loads. These are potential engineering contexts, not verified installations of this LYDL model. Bearing choice must still account for the actual force directions, motion profile and supporting structure.
Medical, clean-environment or other specialized equipment requires its own material, lubricant, cleanliness and validation requirements. Discuss these constraints before treating the illustrated sectors as a suitability statement. Browse the LYDL thin section bearing range when the available envelope calls for another size or contact type.
The following Kaydon references are all open Type X sizes with a 0.250 in axial width and radial section. The table compares nominal envelopes only. Different bore diameters require corresponding shaft and housing changes; this comparison makes no claim about relative stiffness, life or allowable combined load.
| Kaydon reference | Bore d (in) | Outside D (in) | Width B (in) |
|---|---|---|---|
| KA035XP0 | 3.500 | 4.000 | 0.250 |
| KA040XP0 | 4.000 | 4.500 | 0.250 |
| KA042XP0 | 4.250 | 4.750 | 0.250 |
| KA050XP0 | 5.000 | 5.500 | 0.250 |
Compared with KA040XP0, KA035XP0 reduces both diameters by 0.500 in, while KA042XP0 increases them by 0.250 in. KA050XP0 increases both by 1.000 in. Their shared section helps compare packaging space without implying that any of these references is a direct replacement.
Compare published model pages: KA030XP0 dimensions · KA050XP0 dimensions · KB040XP0 dimensions.
Review shaft and housing fits together with the required internal clearance or preload. Request the applicable shoulder diameters, corner clearance and retention details instead of designing from the outer dimensions alone. Identify whether the bearing rotates continuously or oscillates, and provide speed, duty cycle, temperature and load direction for the application review.
An open bearing has no integral seals specified on this page. Plan protection against contamination and arrange lubricant selection and replenishment for the actual environment. Any external seal, cover or labyrinth belongs in the assembly-space review and should be considered when assessing friction and thermal behavior.
Agree inspection criteria before ordering: dimensional tolerances, any specified runout, identification and the documents needed at receipt. Packaging should address corrosion, moisture, separation, ring protection and restraint during transport. The final packaging method is a quotation item; the illustration below does not promise a wooden crate or a particular inspection facility.
A nominal 4-inch bore is 101.6 mm, which differs from 100 mm by 1.6 mm in diameter. That is a design-size difference, not a fit tolerance. Select the correct bore and then establish its shaft fit from the applicable drawing.
No. It is the bearing’s nominal axial width. Retaining features, shoulders, covers and environmental protection may require additional axial or radial space. Request a drawing review before finalizing a housing around the 4 × 4.5 × 0.25 in envelope.
The KA042XP0 reference has a 0.25-inch larger bore and outside diameter while retaining the same quarter-inch section. It therefore needs a different mounting envelope. Availability does not make these sizes interchangeable, and the load and configuration requirements still need review.
Include the contact type and full reference. LYDL-A040 is also used in other LYDL contact-type tables, so the shorthand alone is ambiguous. State “open Type X, KA040XP0 reference” and include an existing drawing or part specification if the inquiry concerns a replacement.
No LYDL accuracy class or preload is specified by this page. Keep the Kaydon reference intact for identification, then state the required running accuracy and internal condition separately. Acceptance criteria must refer to the agreed product specification rather than an assumed cross-brand suffix equivalence.
Send KA040XP0 as the reference, your required quantity, intended use and delivery destination. Add a drawing or detailed operating information when available. LYDL can use these details to discuss the proposed supply configuration and the information required to assess it.
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Kaydon and Reali-Slim are reference-brand trademarks. These sources do not establish LYDL authorization, certification or identical performance. No product certification is asserted by their inclusion.
