JU040CP0 sealed radial contact bearing has a 101.6 × 120.65 × 12.7 mm reference envelope for a four-inch radial support. LYDL lists this size as LYDL-040UU in its Sealed Type C series. For a compact motor-driven mechanism, assess seal resistance, start-up conditions and the complete drive torque budget. Send your bearing-seat drawing, radial load and start-stop cycle to request a supply specification and quotation.
JU040CP0 sealed radial contact bearing is a four-inch, double-sealed Type C reference with a 101.6 × 120.65 × 12.7 mm envelope. It is a candidate for compact mechanisms where radial support must fit around a relatively large shaft or hollow hub.
A small drive can be sensitive to friction that barely matters in a larger machine. Select this bearing with the motor, transmission and operating cycle in view; a speed rating does not establish the torque needed to start the assembled mechanism.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 4.000 | 101.600 |
| Outside diameter, D | 4.750 | 120.650 |
| Width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
The radial section is 9.525 mm, while the axial width is 12.7 mm. Preserve that distinction when designing the shoulder and cover. The nominal bore is a seat dimension, not a tolerance recommendation or a guaranteed clear passage.
The LYDL Sealed Type C parameter table lists LYDL-040UU for this size and a catalog mass of 0.249 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.
Separate acceleration torque from bearing resistance and external process forces. At the output shaft, include the load inertia, desired acceleration, transmission losses and any cable or seal resistance outside the bearing. Convert these demands through the actual gear ratio and efficiency before comparing them with the motor curve.
The most demanding point may be the first movement after a cold dwell, rather than steady rotation. Record how long the mechanism remains stationary, whether the load stays applied and which temperature the bearing reaches before restart.
| Operating event | Information needed for drive selection |
|---|---|
| First movement after storage | Temperature, dwell duration and permitted breakaway resistance |
| Acceleration | Rotating inertia, ramp time and transmission efficiency |
| Steady running | Speed, radial load and measured running resistance |
| Repeated stopping | Cycle frequency and motor thermal limits |
Do not add an arbitrary bearing preload to improve positioning before checking its effect on torque. Positional error can also come from the transmission, control system or supporting structure. A motor that starts one unloaded sample is not evidence of adequate margin over the intended production and temperature range.
Send your JU040CP0 load and motor-duty sheet for review.
| Parameter | KAYDON JU040CP0 reference | LYDL-040UU Sealed Type C listing |
|---|---|---|
| Dynamic radial, Kaydon method / LYDL Cr | 4.773 kN (1,073 lbf) | 5.740 kN; basis not stated in the table |
| Dynamic radial, ISO comparison | 10.324 kN (2,321 lbf) | Not separately stated |
| Static radial | 9.341 kN (2,100 lbf) | 9.340 kN |
| Listed limiting speed | 1,640 rpm, subject to catalog conditions | 1,640 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.
For this size, the LYDL dynamic figure differs from both Kaydon dynamic columns. Treat the entries as separate published references. The supplier must identify the rating method used for the quoted LYDL configuration; selecting whichever number is largest would make the calculation inconsistent.
Kaydon additionally lists a maximum no-load torque of 2.9 lbf·in, approximately 0.328 N·m, for its JU040CP0 under the catalog test conditions: standard internal fit and lubricant, room temperature and less than 5 lbf thrust load. This is not a measured LYDL breakaway-torque value. Request a separate start-up test if that is the machine's acceptance criterion.
An inspection wheel may turn only when a part arrives. Its radial load can be modest while its starts are frequent. Define the maximum time allowed to reach the inspection position and the radial force from a contacting probe or drive element.
Measure the wheel with its covers, transmission and process attachments fitted. If an adjustment changes torque, identify that contribution before changing the bearing specification. This example describes a selection method; it does not claim a tested LYDL installation or a guaranteed positioning result.
Use a seat and retention arrangement that supports the correct ring faces. Check corner clearance, burrs and seal clearance before investigating lubricant changes. Installation force should pass through the ring being fitted, with suitable tooling rather than through the rolling contacts.
A retaining cover must locate the intended component without rubbing a seal or a rotating spacer. Compare rotation before and after final retention under the same conditions. Record the installed clearance requirement separately from the free-bearing condition; a tight fit can alter the available internal clearance.
| Brand | Verified reference | Meaning and comparison limit |
|---|---|---|
| KAYDON | JU040CP0 | Sealed JU series, radial contact Type C. |
| INA / Schaeffler | CSCU 040.2RS | CSC: deep-groove radial family; U: section series; .2RS: seals on both sides. |
KAYDON uses JU040CP0 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 101.6 × 120.65 × 12.7 mm envelope. Fits, internal clearance, seals, accuracy and rating methods still require a manufacturer-specific comparison before replacement.
Agree the fixture, radial and axial test loads, temperature, rotation direction and measurement speed. State whether the limit applies to initial breakaway, peak torque over one revolution or stabilized running torque. Those are different quantities.
Use consistent units and measurement equipment across incoming inspection and assembly. Keep the grease, seal and internal-clearance specification with the test record. This allows procurement to compare successive batches without accepting a lower-friction sample that has a different sealing or clearance configuration.
No. It describes a specific bearing test, not the complete drive. Starting demand also includes inertia, transmission losses, process forces and the temperature-dependent behavior of the supplied configuration. Specify a measured breakaway limit where restart reliability matters.
Compare lubricant temperature, dwell, seal behavior and the control ramp. Also check external contacts and load changes. Record cold and warm torque using the same fixture before attributing the difference to one component.
Accuracy controls specified dimensional and running deviations; it is not a universal low-torque option. Internal clearance, mounting fits, seals and lubrication must be reviewed independently against the drive requirement.
Do not alter the bearing as an unqualified fix. First establish the required protection and torque budget. Ask for a suitable approved configuration if the current seal arrangement cannot meet both requirements.
Test the agreed LYDL Type C configuration in a representative assembly. Document starting conditions, load, torque criteria and repeatability, then link the accepted result to the drawing revision and production specification.
JU045CP0 uses a 114.3 mm bore and JU050CP0 uses a 127 mm bore. Either changes the shaft and housing seats. A larger nominal size should follow the load and space assessment, not a presumption that it will start more easily.
Identify JU040CP0 reference / LYDL-040UU / Sealed Type C. Include the motor torque curve, transmission ratio, load, duty cycle, temperature, quantity and sample-approval criteria. Ask the quotation to state the supplied internal condition and torque-test scope.
Request the JU040CP0 supply specification and quotation.
These sources document manufacturer reference products and their catalog methods; they are not LYDL certifications.
