JU040XP0 is a double-sealed, four-point contact thin section bearing reference with a 4-inch bore and nominal dimensions of 101.6 × 120.65 × 12.7 mm.
Request a JU040XP0 quotation and drawing review. Kaydon performance figures in the description below are identified as reference data, not guaranteed LYDL supply ratings.
The JU040XP0 sealed four-point contact bearing has a nominal envelope of 101.6 × 120.65 × 12.7 mm, with seals on both sides and a 9.525 mm radial section. LYDL lists the corresponding catalog model as LYDL-040UU. For compact rotary inspection fixtures, selection should consider combined loading, seal resistance and installed starting torque.
For a compact rotary inspection fixture, bearing selection involves more than load capacity. Seal resistance, installed fit and lubricant behavior can affect whether a small drive starts smoothly after a dwell period.
Use this page to check the mounting envelope, interpret reference ratings and define the information needed for a LYDL quotation.
| Parameter | Imperial | Metric |
|---|---|---|
| Bore diameter, d | 4.000 in | 101.600 mm |
| Outside diameter, D | 4.750 in | 120.650 mm |
| Axial width, B | 0.500 in | 12.700 mm |
| Radial section, (D − d) / 2 | 0.375 in | 9.525 mm |
| Identification item | Description |
|---|---|
| Reference designation | JU040XP0 |
| LYDL catalog model | LYDL-040UU |
| Bearing type | Thin section ball bearing |
| Contact arrangement | Four-point contact, Type X |
| Sealing arrangement | Seals on both sides |
| Dimensional system | Inch series with metric conversions |
The radial section is 9.525 mm; the axial width is 12.7 mm. These dimensions are not interchangeable when designing the bearing pocket and retaining components.
The nominal envelope is also listed in the LYDL sealed Type X series table. Manufacturing tolerances, fits and acceptance limits require an approved supply drawing.
The table below contains Kaydon JU040XP0 catalog reference values, not confirmed LYDL supply ratings. Source [1] is linked at the end of this page.
| Rating | Kaydon reference value | Converted SI value |
|---|---|---|
| Dynamic radial | 1,417 lbf | 6.303 kN |
| Dynamic axial | 2,210 lbf | 9.831 kN |
| Dynamic moment | 2,326 lbf·in | 262.803 N·m |
| Static radial | 2,100 lbf | 9.341 kN |
| Static axial | 5,260 lbf | 23.398 kN |
| Static moment | 4,600 lbf·in | 519.730 N·m |
Dynamic ratings use a one-million-revolution L10 basis. Static ratings assume rigid shaft and housing support. SI figures are rounded conversions.
These are separate ratings, not loads that may all be applied at full value simultaneously. Provide the actual radial force, axial force, overturning moment and duty cycle for a combined-load assessment.
For LYDL procurement, the quotation and approved technical specification must identify the applicable supply ratings. Reference-brand values do not establish the performance of a different manufacturer’s bearing.
Kaydon’s JU040XP0 selection table lists:
| Reference characteristic | Catalog value |
|---|---|
| Limiting speed | 620 rpm |
| Maximum no-load torque | 2.9 lbf·in ≈ 0.328 N·m |
The speed limit carries the catalog’s loading restriction: up to 20% of dynamic capacity. The torque figure applies to the stated standard internal fit and lubricant, at room temperature, under a 5 lbf axial test load. It is not a guaranteed cold-start or installed breakaway torque.
When specifying a drive, distinguish:
State the available torque at the bearing axis. A motor’s rated output alone does not describe the torque remaining after the transmission and other mechanical losses.
For a torque-sensitive fixture, agree a measurement procedure before ordering, including temperature, mounting condition, axial load and the difference between starting and running measurements.
Request a JU040XP0 drawing and torque-requirement review.
An enclosed rotary inspection fixture is a useful selection example for this size. The fixture indexes a component, holds position during measurement and then moves to the next inspection angle.
Three questions help define the bearing requirement:
Where is the payload?
Record the payload’s center of gravity relative to the bearing support plane. An offset creates an overturning moment that must be included with the direct forces.
How does the fixture move?
Provide indexing angle, acceleration, dwell time and cycles per hour. A low average speed may still involve frequent starts and significant acceleration loads.
Where is position measured?
Identify the encoder location and permissible movement at the inspection point. Bearing deflection, support distortion and transmission compliance all contribute to the machine’s positioning behavior.
This is an engineering selection example, not a claim of a completed LYDL installation. Suitability requires review of the actual machine.
Double seals help retain grease and limit contaminant entry. They do not by themselves establish suitability for washdown, immersion, vacuum or chemical exposure.
Describe the environment before choosing the LYDL configuration: coolant, cleaning agents, airborne particles, temperature and storage conditions. Confirm seal material and lubricant together, since these choices can affect rotational resistance.
During the mounting review:
If rotational resistance increases during assembly, investigate the fit, housing distortion, retention and interference before compensating with a larger motor.
The following designations share the nominal 101.6 × 120.65 × 12.7 mm envelope in the cited catalogs. The table compares identification, not guaranteed interchangeability.
| Brand | Reference designation | Naming and suffix explanation |
|---|---|---|
| KAYDON | JU040XP0 | J identifies standard steel construction with two nitrile seals; 040 identifies a 4-inch bore; X identifies four-point contact. P is the separator code, and the final 0 is a precision code. |
| INA / Schaeffler | CSXU 040.2RS | CSX identifies the four-point contact family; U identifies the section series; 040 denotes the 4-inch size. .2RS indicates sealing on both sides. |
| NSK | NBX10112DD | NBX identifies the four-point contact family. The complete DD designation identifies the sealed catalog configuration; the nominal dimensions must still be checked in the table. |
Sources [1]–[3] are linked below.
For replacement assessment, compare the full designation, tolerances, internal clearance or preload, seals, friction and rating conditions. Do not transfer one brand’s load or speed ratings to another.
Kaydon’s P and final 0 are separate identification positions. They must not be read together as a claim that the LYDL supply has ISO P0 accuracy.
| Reference | Bore × outside diameter × width | Selection distinction |
|---|---|---|
| JU040XP0 | 101.60 × 120.65 × 12.70 mm | Four-inch bearing seat |
| JU045XP0 | 114.30 × 133.35 × 12.70 mm | Half-inch increase in nominal bore |
| JU050XP0 | 127.00 × 146.05 × 12.70 mm | Five-inch bearing seat |
| JU060XP0 | 152.40 × 171.45 × 12.70 mm | Six-inch bearing seat |
These references retain the same nominal JU section while changing both seating diameters. A larger model requires a mounting redesign; it is not a direct replacement in the JU040XP0 pocket.
Browse the Sealed Four-Point Contact Bearings (Type X) category for available product pages.
The LYDL company overview provides manufacturing and product-range information. For this specific inquiry, use LYDL-040UU / JU040XP0 reference and request written confirmation of:
| Supply item | Information to confirm |
|---|---|
| Drawing | Dimensions, tolerances, revision and mounting requirements |
| Materials | Rings, balls, cage and seals |
| Internal configuration | Clearance or preload and lubrication |
| Performance | Applicable ratings and any agreed torque limits |
| Inspection | Required checks, test conditions and supplied records |
| Delivery | Quantity, lead time, marking and protective packing |
Specify acceptance criteria before production or order release. For rotational resistance, identify whether the test concerns breakaway torque or running torque and whether it is performed before or after installation.
General factory photographs support an understanding of the process; they do not replace measurements for the supplied batch.
No. It is the converted Kaydon maximum no-load torque under specified catalog test conditions. Define the required breakaway and running torque for the installed assembly, including temperature and dwell time.
Not necessarily. Coolant, abrasive particles, cleaning chemicals or washdown may require additional protection. Select the bearing seals and machine enclosure for the actual exposure.
No. They are separate catalog ratings. Simultaneous loading requires an assessment of the actual force and moment combination, speed, life target and support conditions.
No. Its radial section is 9.525 mm and its axial width is 12.7 mm. Use the complete nominal envelope: 101.6 × 120.65 × 12.7 mm.
No. A matching envelope is the starting point. Compare the internal design, accuracy, sealing, friction and performance requirements before approving a replacement.
Send the reference JU040XP0 / LYDL-040UU, quantity, destination and required delivery date.
For an engineering review, include the assembly drawing, radial and axial loads, payload offset or moment, speed profile, operating temperature and any starting-torque limit. Identify the inspection documents required with the shipment.
Request a JU040XP0 quotation and submit your drawing.
The references below support model identification and catalog comparison. They are manufacturer publications, not evidence that a LYDL bearing has been certified to another brand’s specification.
