JU045CP0 sealed radial contact bearing has a 114.3 × 133.35 × 12.7 mm nominal envelope, corresponding to LYDL-045UU in the Sealed Type C series. For an inspection wheel, define radial runout at the working surface and separate it from bearing-ring accuracy. Provide the wheel geometry, probe force, datums and acceptance limit when requesting a LYDL drawing review, proposed accuracy class and quotation.
JU045CP0 sealed radial contact bearing is a 4.5-inch reference measuring 114.3 × 133.35 × 12.7 mm. It can be evaluated for a compact inspection wheel or measuring roller with predominantly radial bearing loading.
The reading at the wheel surface contains more than the bearing's own running deviation. Seat eccentricity, wheel geometry, probe loading and the measurement fixture can all affect the result. Selection begins with a clear definition of the required output accuracy.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 4.500 | 114.300 |
| Outside diameter, D | 5.250 | 133.350 |
| Width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
Keep the 114.3 mm inch-derived bore exact on the drawing. A rounded 114 mm description is not an acceptable replacement manufacturing dimension. The 12.7 mm width and 9.525 mm radial section also need separate tolerances and support details.
The LYDL Sealed Type C parameter table lists LYDL-045UU for this size and a catalog mass of 0.277 kg. Include Sealed Type C when ordering: LYDL uses UU references in more than one bearing family. Confirm the complete supply designation on the quotation.
Specify where the probe contacts the wheel, which component supplies the datum and whether the test is performed loaded or unloaded. State the probe direction and applied force. A runout number without those conditions may be impossible to reproduce at another inspection station.
Allocate the permitted output error among the bearing, shaft seat, wheel mounting and wheel surface. The allocation should follow the actual assembly and measurement method; do not simply add catalog accuracy labels or treat an accuracy class as a guaranteed machine result.
| Measured feature | What the result describes |
|---|---|
| Bearing ring against a defined datum | The specified bearing inspection characteristic |
| Shaft seat before assembly | Manufacturing geometry of the mating part |
| Wheel surface after assembly | Combined behavior of the mounted components |
| Wheel under probe or process force | Geometry plus the relevant loaded response |
If the wheel is removable, define its repeatable locating interface and tightening procedure. Reassembly variation can dominate an otherwise stable bearing result. Record angular position where useful so a repeated pattern can be traced to the appropriate component.
Request a JU045CP0 review with your runout acceptance drawing.
| Parameter | KAYDON JU045CP0 reference | LYDL-045UU Sealed Type C listing |
|---|---|---|
| Dynamic radial, Kaydon method / LYDL Cr | 5.084 kN (1,143 lbf) | 6.010 kN; basis not stated in the table |
| Dynamic radial, ISO comparison | 10.756 kN (2,418 lbf) | Not separately stated |
| Static radial | 10.409 kN (2,340 lbf) | 10.410 kN |
| Listed limiting speed | 1,440 rpm, subject to catalog conditions | 1,440 rpm, subject to supply confirmation |
Kaydon values describe the Kaydon bearing, not tested LYDL performance. Its dynamic ratings use a one-million-revolution L10 basis; the ISO column is identified as an ISO 281:1990 comparison. Static ratings assume rigid support. The listed speed applies at loads up to 20% of dynamic capacity. Do not combine the columns or apply these limits simultaneously without the appropriate selection analysis.
The radial capacities below address load reference data, not measuring accuracy. LYDL and Kaydon publish different dynamic figures for this size. Do not infer a tighter runout tolerance or a stiffer inspection wheel from the larger numerical rating.
Neither JU045CP0 nor the corresponding series listing specifies the complete LYDL inspection method for your order. Ask for the relevant dimensional and running tolerances on a confirmed drawing. A supplier accuracy label and an assembled-wheel acceptance limit should remain separately identifiable.
A roller checked with a contacting probe can deflect under the probe force or under the process load being measured. If the support is compliant, changing the force can change the reading even when the geometry has not changed.
Establish a consistent test force and compare it with the intended operating condition. Where the application requires very small output variation, evaluate the complete fixture and support arrangement. This example is an inspection-planning approach, not a claim of a particular micron-level capability for LYDL production.
Keep mating faces clean and inspect shoulders for burrs before assembly. Check that retainers contact the intended ring faces and do not rub the seals. Apply fitting force through the appropriate ring and use the agreed fastener sequence for the wheel mount.
Do not reduce internal clearance simply to make an indicator reading appear steadier. Review the resulting torque and loaded behavior before changing the bearing configuration. If a wheel shows error after tightening, compare measurements at controlled assembly stages rather than compensating for it with additional force.
| Brand | Verified reference | Meaning and comparison limit |
|---|---|---|
| KAYDON | JU045CP0 | Sealed JU series, radial contact Type C. |
| INA / Schaeffler | CSCU 045.2RS | CSC: deep-groove radial family; U: section series; .2RS: seals on both sides. |
KAYDON uses JU045CP0 for its sealed radial reference: J identifies standard steel with two nitrile seals; C identifies radial contact; P is a separator code; and the final 0 is Kaydon precision class 1, associated with ABEC 1F. The ending CP0 must not be read as a universal ISO P0 accuracy designation.
These references share the nominal 114.3 × 133.35 × 12.7 mm envelope. Fits, internal clearance, seals, accuracy and rating methods still require a manufacturer-specific comparison before replacement.
Repeat the test without changing the setup to establish its short-term repeatability. Then assess the effect of remounting, operator changes and temperature as required by the inspection plan. A highly repeatable fixture can still have a systematic error relative to its datum.
Record the indicator or sensor, resolution, contact point, test force, speed and datum arrangement. The purchase specification should identify which values appear on the bearing report and which are measured only after the customer installs the wheel. Retain sample approval records with the final drawing revision.
No. The assembled reading includes the wheel, seats, mounting interface and measurement conditions. Define the required wheel-level result and allocate the relevant component tolerances rather than equating the two measurements.
The loaded response of the wheel, support or fixture may contribute. Confirm the intended contact force and compare measurements consistently. A force-dependent reading should not be interpreted as pure geometric runout without investigation.
No. Smoothness is a different observation. Measure the specified characteristic with the agreed datum, load and instrument; also assess running resistance separately where it matters to the machine.
First identify the required component tolerance and the rest of the assembly error budget. A tighter bearing specification may add cost without improving the final result if the wheel interface or fixture dominates the error.
They need matching definitions, datums, supports, test loads, temperature and measurement procedures. Compare the actual inspection conditions before treating two numerical results as evidence of better or worse bearing quality.
JU040CP0 uses a 101.6 mm bore and JU050CP0 uses a 127 mm bore. Choosing either changes the mounting geometry. Their model numbers do not rank them by output accuracy; the required tolerances and inspection arrangement must be specified for each proposal.
Use JU045CP0 reference / LYDL-045UU / Sealed Type C and attach the inspection drawing. State the wheel contact point, test force, required runout, operating speed, quantity and report requirements when requesting the quotation.
Request the JU045CP0 supply specification and quotation.
These sources document manufacturer reference products and their catalog methods; they are not LYDL certifications.
