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The KB050XP0 thin section bearing reference identifies an open four-point contact design with a 5-inch bore. LYDL lists this nominal size as LYDL-B050 Type X, measuring 5 × 5.625 × 0.3125 in (127 × 142.875 × 7.9375 mm). Use the dimensional envelope to compare your installation, and send the model, quantity and application to request a quotation.
KB050XP0 belongs to Kaydon’s reference naming system. The product offered here is identified with the LYDL brand; reference names describe comparison targets and do not imply an authorized brand relationship. Include “LYDL-B050, open Type X, KB050XP0 reference” because a LYDL shorthand can also occur in other contact-type series.
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| Parameter | Symbol | Inches | Millimeters |
|---|---|---|---|
| Bore diameter | d | 5 | 127 |
| Outside diameter | D | 5.625 | 142.875 |
| Axial width | B | 0.3125 | 7.9375 |
| Radial section, (D − d) / 2 | — | 0.3125 | 7.9375 |
Inches are the original nominal units; conversion uses exactly 25.4 mm per inch. The values describe the bearing envelope, not shaft fits, housing tolerances or a complete installed assembly. LYDL’s open Type X series table provides the broader size range.
The 127 mm bore matches the nominal shaft size of KA050XP0 and KC050XP0, while the 142.875 mm outside diameter occupies the middle envelope of those three choices. The 7.9375 mm width must be retained in the assembly stack calculation. Rounding that value to 8 mm is useful for rough discussion only and is not a mounting dimension.
The reference ratings below follow the Kaydon Reali-Slim open Type X catalog entry for the equivalent KB050XP0 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 | 1,236 lbf | 5.5 kN |
| Static radial load rating | C0r | 2,150 lbf | 9.6 kN |
| Dynamic thrust load rating | Ca | 1,980 lbf | 8.8 kN |
| Static thrust load rating | C0a | 5,380 lbf | 23.9 kN |
| Dynamic moment rating | M | 2,463 in-lbf | 278 N·m |
| Static moment rating | M0 | 5,720 in-lbf | 646 N·m |
| Approximate mass | m | 0.38 lb | 0.172 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 uses four-point contact geometry and is considered for reversing axial loading and moment support. Combined-load suitability depends on how forces act together, the bearing configuration and the surrounding support. A thin ring with the right bore is not sufficient evidence that it will support a proposed overturning moment or meet a motion-accuracy target.
The KB reference family retains its 0.3125 × 0.3125 in section as bore size changes. The X contact type must remain explicit in an inquiry: an angular-contact or radial-contact bearing of similar size changes the load arrangement. Compare the Type A angular-contact series or Type C radial-contact series when the duty calls for a different contact design.
| Brand | Reference designation | Comparison scope |
|---|---|---|
| LYDL | LYDL-B050 · open Type X | Specify the full reference and agreed supply drawing |
| Kaydon | KB050XP0 | Official open Type X nominal size |
| Silverthin | SB050XP0 | Official open Type X nominal size |
| INA / Schaeffler | CSXB050 | Silverthin manufacturer interchange listing; confirm current INA specification |
The table compares the nominal 5 × 5.625 × 0.3125 in envelope and four-point contact category. Silverthin uses the SB family prefix for this section, whereas the Kaydon designation uses KB. INA / Schaeffler uses the CSXB family designation in this comparison; CSXB050 is the listed reference for this size. The CSX naming identifies the four-point contact family. Keep each brand with its full code and confirm its current specification and availability.
These references are starting points for an interchange review, not an unconditional replacement statement. Check ring geometry, shoulders and corner clearance, fits, internal clearance or preload, accuracy, lubricant and operating duty. Published ratings from different brands are not transferred into LYDL supply data. The suffix does not establish LYDL precision, cage material or preload.
You can request a price for the KB050XP0 reference before every installation detail is settled. Include quantity and delivery destination first. For a replacement assessment, add the existing drawing or designation and identify which dimensions cannot change; this helps distinguish a bore-size change from a section-size change.
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The 127 mm nominal opening and 7.9375 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.
For oscillating motion, describe the travel angle, reversal frequency and dwell periods as well as speed. For continuous rotation, specify duty cycle, temperature, lubricant and external protection. These operating details help distinguish a dimensional candidate from a bearing configuration suitable for the actual mechanism.
| Reference model | Bore d (in) | Outside D (in) | Width B (in) |
|---|---|---|---|
| KB050XP0 | 5 | 5.625 | 0.3125 |
| KA050XP0 | 5 | 5.5 | 0.25 |
| KC050XP0 | 5 | 5.75 | 0.375 |
| KD050XP0 | 5 | 6 | 0.5 |
All listed rows are open Type X references. A shared bore can preserve the nominal shaft diameter while changing the housing bore and axial stack. A shared section preserves bearing width while the shaft and housing diameters change together. The table makes no ranking of load capacity, stiffness, torque or service life.
Compare published model pages: KA050XP0 dimensions · KC050XP0 dimensions · KD050XP0 dimensions.
Browse the open four-point contact bearing category for this product family.
Allow for more than the 7.9375 mm nominal bearing width when reviewing the axial stack. Shaft shoulders, retainers, covers and external seals occupy additional space. Check shaft and housing roundness and support continuity, and apply mounting force through the appropriate ring rather than through the rolling elements. An approved drawing should define the actual interfaces.
Agree material, cage, clearance or preload, accuracy and lubrication as part of the supply specification. Request the inspection items that matter to your assembly, such as dimensional verification and agreed running checks. No numerical load, speed, runout, torque or life guarantee is inferred solely from the reference code or from another brand’s catalog.
Discuss corrosion protection, moisture control, separation between rings and restraint against movement or distortion during transport. Packing should support the thin ring without concentrated clamping. The final package and any inspection records belong to the agreed order; the illustration below is not a photograph of your batch or evidence of a particular test facility.
Use 7.9375 mm, the exact conversion of 5/16 in, for the nominal bearing dimension. An 8 mm label is 0.0625 mm larger and should not replace the inch-based value in the axial stack. Manufacturing tolerance and mounting allowance are separate requirements.
Compare the complete envelope. KB050XP0 is 5 × 5.625 × 0.3125 in, while KA050XP0 is 5 × 5.5 × 0.25 in. The bore agrees, but the outside diameter and width differ, so the housing and axial retention require review.
For KB050XP0, both are nominally 0.3125 in (7.9375 mm), but they are different measurements. Width is measured along the axis; radial section is half the difference between outside and bore diameters. Neither figure includes the housing wall, retaining parts or external protection.
Use LYDL-B050 with “open Type X” and the full KB050XP0 reference. Include any existing drawing or special configuration. The shorter LYDL designation alone does not resolve contact type, preload, clearance, material or accuracy, and the brand comparison table is not a declaration of fully interchangeable performance.
Open identifies a bearing without an integral sealing arrangement in this reference category. It does not establish preload, clearance or lubricant. External contamination protection and the internal setting should be chosen for the actual duty and stated in the agreed supply specification.
Send “LYDL-B050, open Type X, KB050XP0 reference,” quantity, application and destination for a quotation. If the bearing must fit an existing assembly, include the drawing or the interfaces that must remain fixed. You can also request a drawing for review before agreeing the supply configuration.
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Brand names and catalog designations remain the property of their respective owners. References support dimensions, structure and nomenclature; they do not certify a LYDL configuration or guarantee current availability from the reference manufacturer.
