The JU100XP0 sealed four-point contact bearing is a ten-inch reference with a 254 × 273.05 × 12.7 mm envelope. LYDL lists it as LYDL-100UU.
For thermally variable rotary assemblies, assess the shaft, housing and bearing temperatures together. An acceptable room-temperature fit does not establish the operating clearance.
Send the materials, temperature range, motion profile and required accuracy with your inquiry. LYDL supply details and ratings are confirmed for the quoted configuration.
The JU100XP0 sealed four-point contact bearing has a 254 × 273.05 × 12.7 mm nominal envelope. The matching LYDL catalog identity is LYDL-100UU.
For a ten-inch rotary support, material choice and uneven heating deserve attention during fit selection. Assess the complete temperature cycle rather than assuming that an ambient inspection represents operating conditions.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 10.000 | 254.000 |
| Outside diameter, D | 10.750 | 273.050 |
| Axial width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
Record the reference temperature used for dimensional inspection. A nominal 254 mm bore is not a complete shaft-fit specification; tolerances and operating conditions belong on the assembly drawing.
The LYDL sealed Type X series table identifies this size as LYDL-100UU. Nominal dimensions do not replace the approved tolerances and supply specification.
List temperatures for the shaft seat, inner ring, outer ring and housing at startup, steady operation and shutdown. Include heat sources such as a nearby motor and asymmetric cooling.
The basic expansion relation ΔD = α × D × ΔT estimates free dimensional change. It does not directly calculate bearing operating clearance: component constraints, ring fits and temperature differences must also be considered.
| Condition | Design question |
|---|---|
| Cold start | Can lubricant resistance and the installed internal condition meet the drive requirement? |
| Warm operation | Do seat fits and differential expansion remain acceptable? |
| Thermal transient | Is one component heating faster than the others? |
| Cooldown | Does the assembly return to its accepted behavior without binding? |
An aluminum housing does not, by itself, prove that clearance will increase or decrease. State the materials and temperatures of both sides of the support before drawing that conclusion.
Send your material and temperature data for a JU100XP0 review.
| Rating | Converted SI value |
|---|---|
| Dynamic radial | 10.516 kN |
| Dynamic axial | 17.482 kN |
| Dynamic moment | 1039.573 N·m |
| Static radial | 22.197 kN |
| Static axial | 55.469 kN |
| Static moment | 2924.047 N·m |
These rounded values are converted from the Kaydon JU100XP0 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 200 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 positioning stage near a motor or process enclosure may experience an asymmetric temperature field. Specify the location and timing of temperature measurements alongside torque and output-position measurements.
During evaluation, distinguish a gradual warm-up change from a sudden increase following mechanical adjustment. Define acceptance at the temperatures relevant to operation; do not invent a fixed warm-up time without test evidence. This scenario is a design discussion, not a validated LYDL application.
Request compatibility among grease, seals, temperature and required rotational resistance. A lubricant temperature range alone does not certify the entire bearing assembly for that range.
Keep initial internal clearance, installed clearance and operating clearance distinct in specifications. If preload is required, identify how it is established and verified. Avoid selecting a tighter fit merely to remove measured motion before its thermal effects are assessed.
| Brand | Reference | Naming notes |
|---|---|---|
| KAYDON | JU100XP0 | J: standard steel with two nitrile seals; X: four-point contact; P: separator code; final 0: precision code. |
| INA / Schaeffler | CSXU 100.2RS | CSX: four-point family; U: section series; .2RS: sealing on both sides. |
| NSK | NBX25412DD | Sealed NBX catalog configuration; retain the DD suffix when checking the complete designation. |
The cited entries share the nominal 254 × 273.05 × 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.
JU080XP0 uses a 203.2 × 222.25 × 12.7 mm envelope, while JU120XP0 uses 304.8 × 323.85 × 12.7 mm. Compare available space and operating conditions within the sealed Type X category.
The broader thin section bearing range can support a new layout review when the existing inch-series envelope is not mandatory.
A LYDL-100UU order should identify materials, drawing revision, accuracy, internal condition, seals and lubricant. Ask the quotation to state which performance figures are confirmed for that supply.
For thermal evaluation, define sensor locations, load, speed, soak criteria and restart procedure. Preserve part and batch identification so any change in grease, seal or internal configuration can be traced during comparison tests.
No. Its expansion is only one influence. Shaft growth, ring temperatures, restraint and initial interference determine the installed result. Evaluate the complete support rather than predicting clearance from housing material alone.
That verifies one condition. Fit selection also needs load direction, rotating ring, materials and temperatures across the operating cycle. Confirm both assembly and operating requirements.
No. Warm-up may be part of operation, but it does not correct an unsuitable fit. Establish acceptable conditions first, then validate any operating routine through testing.
No. Seals, cage, internal condition, material behavior and heat dissipation also matter. Obtain confirmation for the complete quoted configuration and duty.
Record temperatures at defined locations, elapsed time, speed, load and torque using a consistent method. Include the cold-start and cooldown behavior to help separate thermal effects from mechanical changes.
Identify JU100XP0 / LYDL-100UU and attach your temperature map, seat materials and required motion accuracy. Request a drawing review and quotation.
These catalogs document reference products; they are not LYDL product certifications.
