The JU045XP0 sealed four-point contact bearing has a 114.3 × 133.35 × 12.7 mm envelope and a 4.5-inch bore. Its LYDL catalog reference is LYDL-045UU.
Use this page when reviewing an existing inch-based assembly: confirm the seat diameters, axial stack, shoulders and sealing space before approving a substitute. Matching three nominal dimensions is only the first check.
Send the original designation and measured installation details for a LYDL drawing and quotation.
The JU045XP0 sealed four-point contact bearing is a 4.5-inch reference measuring 114.3 × 133.35 × 12.7 mm. LYDL lists the corresponding model as LYDL-045UU.
This intermediate size is useful to investigate when an existing machine drawing specifies an inch-based seat. A retrofit decision should preserve the complete interface, including retention and functional accuracy, rather than match only the old part number.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 4.500 | 114.300 |
| Outside diameter, D | 5.250 | 133.350 |
| Axial width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
Do not round a 114.3 mm seat to 114 mm when preparing manufacturing dimensions. Record measurements at a defined temperature and distinguish nominal size from the permitted limits.
The LYDL sealed Type X series table identifies this size as LYDL-045UU. Nominal dimensions do not replace the approved tolerances and supply specification.
Collect the old bearing designation, drawings and photographs before removal if access permits. Note orientation and the order of spacers, covers and retaining hardware. A worn sample can identify features but should not become the sole source of manufacturing tolerances.
| Interface | Evidence to collect |
|---|---|
| Inner-ring seat | Diameter limits, shoulder location and corner clearance |
| Outer-ring seat | Housing dimensions, support length and retention |
| Axial stack | Bearing width, spacers, cover position and intended clamp contact |
| Adjacent parts | Seal clearance, rotating gaps and assembly-tool access |
An axial gap should not be removed by selecting an arbitrary thicker spacer. First determine whether the original design locates one ring, both rings or another component through that stack.
For an unavailable original bearing, separate dimensions that are confirmed by the drawing from measurements affected by wear or damage. Mark unresolved requirements for engineering approval.
Send the retrofit interface record for a JU045XP0 quotation.
| Rating | Converted SI value |
|---|---|
| Dynamic radial | 6.717 kN |
| Dynamic axial | 10.587 kN |
| Dynamic moment | 312.064 N·m |
| Static radial | 10.409 kN |
| Static axial | 26.067 kN |
| Static moment | 645.143 N·m |
These rounded values are converted from the Kaydon JU045XP0 entry in reference [1], not confirmed LYDL performance. Dynamic ratings use a one-million-revolution L10 basis; static values assume rigid support. Full ratings cannot be applied simultaneously. The listed 550 rpm limit carries the catalog condition of loads up to 20% of dynamic capacity. Confirm the actual duty and LYDL supply ratings before approval.
A small indexing mechanism may retain usable shaft and housing parts while its bearing needs replacement. Verify that the original seats remain within specification and that retaining faces are undamaged. A new bearing cannot correct a worn or distorted interface.
Plan a post-installation check of movement, rotational resistance and output accuracy under a representative load. Agree the test before ordering so the replacement can be evaluated objectively. This example is not a claim of drop-in compatibility.
The replacement review should also cover internal clearance or preload, cage, seal friction, lubricant and accuracy. Keep supplier tolerances associated with the correct brand and configuration.
Inspect shoulder contact and adjacent-part clearance during trial assembly. Stop if installation requires unexplained force; forcing a nominally similar bearing into a mismatched seat can damage both components.
| Brand | Reference | Naming notes |
|---|---|---|
| KAYDON | JU045XP0 | J: standard steel with two nitrile seals; X: four-point contact; P: separator code; final 0: precision code. |
| INA / Schaeffler | CSXU 045.2RS | CSX: four-point family; U: section series; .2RS: sealing on both sides. |
| NSK | NBX11412DD | Sealed NBX catalog configuration; retain the DD suffix when checking the complete designation. |
The cited entries share the nominal 114.3 × 133.35 × 12.7 mm envelope. Compare tolerances, internal condition, sealing and rating methods before interchange. A brand suffix is not a LYDL accuracy or performance guarantee.
JU040XP0 has a 101.6 × 120.65 × 12.7 mm envelope; JU050XP0 measures 127 × 146.05 × 12.7 mm. JU045XP0 lies between them in bore size. Although all three share the nominal section, moving between them changes both seat diameters.
Quote LYDL-045UU together with the JU045XP0 reference and the approved drawing revision. Specify the required material, internal condition, seals, lubricant and acceptance documentation instead of relying on an equivalent-model label alone.
For a repeat order, retain the approved configuration and report references. Packing identification should allow receiving staff to distinguish this 4.5-inch size from adjacent JU models.
No. That changes the nominal seat by 0.3 mm. Use the approved shaft dimension and tolerance; a rounded catalog reference is not a fit specification.
It can provide clues, but wear, deformation and missing markings can obscure the original requirements. Combine it with machine drawings, seat measurements and the required operating performance.
Check the complete axial stack, spacer dimensions, seating shoulders and corner interference. Do not tighten the cover to force closure or remove material without determining the intended retention arrangement.
Only after checking their condition and compatibility with the approved configuration. A changed internal arrangement or dimensional tolerance can alter how the stack locates or loads the bearing.
Use a signed dimensional and functional comparison, then an agreed installation and acceptance procedure. Include torque, accuracy, internal condition and operating duty as well as nominal dimensions.
For JU045XP0 / LYDL-045UU, provide the original designation, interface record, quantity and required date. Request the proposed replacement drawing and quote.
These catalogs document reference products; they are not LYDL product certifications.
