The JU080XP0 sealed four-point contact bearing uses an eight-inch bore in a 203.2 × 222.25 × 12.7 mm envelope. Its LYDL catalog designation is LYDL-080UU.
This double-sealed Type X reference suits assessment where a compact rotary support must be integrated into a lightweight structure. Pay particular attention to seat geometry, retaining-cover stiffness and changes in rotation after assembly.
Provide the housing section and fastening arrangement so the quotation can define the bearing configuration and inspection conditions.
The JU080XP0 sealed four-point contact bearing measures 203.2 × 222.25 × 12.7 mm. LYDL identifies the corresponding eight-inch catalog size as LYDL-080UU.
When the surrounding structure is lightweight, the main question is whether the assembled seats preserve the bearing’s geometry. A satisfactory loose bearing does not prove that a thin cover or flexible housing will support it correctly.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 8.000 | 203.200 |
| Outside diameter, D | 8.750 | 222.250 |
| Axial width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
The eight-inch bore does not create a thicker ring section than the smaller JU sizes. Review the housing wall, cover span and shoulder support as part of the bearing arrangement.
The LYDL sealed Type X series table identifies this size as LYDL-080UU. Nominal dimensions do not replace the approved tolerances and supply specification.
A useful assembly trial records measurements before and after each major restraint is applied. Use the same setup and defined test load so that changes are interpretable.
| Assembly stage | Suggested observation |
|---|---|
| Empty housing | Seat geometry and mounting-face condition |
| Bearing seated | Rotation and position before final retention |
| Cover secured | Change in torque, runout or axial behavior |
| Representative load applied | Deflection at the functional output point |
If resistance changes after the cover is tightened, investigate the seat, cover contact and fastener pattern. Do not immediately assign the change to bearing quality. Conversely, do not accept an out-of-spec bearing simply because the assembly is compliant.
Fastener torque and tightening sequence must come from the joint design. There is no universal JU080XP0 cover-bolt torque that can be specified from bearing diameter alone.
Request a JU080XP0 review with your housing and cover drawing.
| Rating | Converted SI value |
|---|---|
| Dynamic radial | 9.261 kN |
| Dynamic axial | 15.168 kN |
| Dynamic moment | 739.147 N·m |
| Static radial | 17.926 kN |
| Static axial | 44.794 kN |
| Static moment | 1906.054 N·m |
These rounded values are converted from the Kaydon JU080XP0 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 310 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 sensor positioner may require low mass while resisting an offset instrument load. Model or test the load path through the instrument bracket, rotating plate, bearing seats and base. Reducing the bearing’s internal clearance cannot compensate for a flexible bracket.
Define separate limits for free-running resistance, unloaded runout and movement under the specified load. This example explains the design review; it is not a tested LYDL machine specification.
Check that shoulders and covers bear on the intended ring faces rather than on seals or rotating neighbors. Burrs and localized high spots can alter the support even when nominal dimensions are correct.
Specify surface geometry, fit and axial retention on the drawing. Apply installation force through the fitted ring and protect seal edges. Use an agreed preload configuration instead of attempting to create one by progressively tightening the cover.
| Brand | Reference | Naming notes |
|---|---|---|
| KAYDON | JU080XP0 | J: standard steel with two nitrile seals; X: four-point contact; P: separator code; final 0: precision code. |
| INA / Schaeffler | CSXU 080.2RS | CSX: four-point family; U: section series; .2RS: sealing on both sides. |
| NSK | NBX20312DD | Sealed NBX catalog configuration; retain the DD suffix when checking the complete designation. |
The cited entries share the nominal 203.2 × 222.25 × 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.
JU070XP0 has a 177.8 × 196.85 × 12.7 mm envelope; JU100XP0 uses 254 × 273.05 × 12.7 mm. These are different seat sizes, not stiffness upgrades that preserve the existing housing. Explore the sealed four-point contact category when comparing layouts.
The LYDL company profile introduces the supplier; the purchase specification should identify the actual checks for LYDL-080UU. Agree the datum, measurement support, test load, temperature and acceptance limits.
Request the proposed material, cage, seal, lubricant and internal-condition specification. A free-state inspection report and an installed acceptance record answer different questions and should not be used interchangeably.
Compare the cover contact, seat geometry and axial stack with the approved drawing. Record the stage at which resistance changes. Inspect for interference or distortion before changing the specified fit or increasing motor torque.
Preload changes bearing behavior but does not make the housing rigid. Review structural deflection first; excessive preload can add friction and reduce the available operating margin.
Not automatically. Their datums, supports and loads may differ. Specify both test arrangements and allocate the machine’s error budget among the bearing, seats, retainers and output structure.
No. Fastener size, joint materials, contact geometry and the required clamping force determine it. Obtain the value and tightening sequence from the assembly design.
Use repeatable measurements with documented fixtures, then compare results through controlled assembly stages. Inspect both components against their individual specifications rather than inferring the cause from one final torque reading.
Send the housing drawing, cover design, load direction and required output accuracy with JU080XP0 / LYDL-080UU. Ask LYDL for a configuration proposal and quotation.
These catalogs document reference products; they are not LYDL product certifications.
