JU050CP0 sealed radial contact bearing measures 127 × 146.05 × 12.7 mm and corresponds to the LYDL-050UU Sealed Type C catalog entry. Its five-inch envelope can be evaluated for pulley and roller supports with predominantly radial loading. Include both belt tensions, belt directions and pulley position when requesting selection support. LYDL supply ratings, fits, seals and lubrication should be confirmed for the proposed assembly.
JU050CP0 sealed radial contact bearing provides a 127 × 146.05 × 12.7 mm reference envelope for a five-inch radial support. The relevant LYDL listing is LYDL-050UU in the Sealed Type C series.
In a belt-driven mechanism, transmitted torque alone does not describe the bearing load. The bearing arrangement also reacts the forces created by belt tension and by the location of the pulley relative to the supports.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 5.000 | 127.000 |
| Outside diameter, D | 5.750 | 146.050 |
| Width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
Allow 9.525 mm of radial bearing section and 12.7 mm of axial width. A pulley hub, retaining ring and housing wall need their own space beyond these nominal dimensions. Check removal access before freezing the hub design.
The LYDL Sealed Type C parameter table lists LYDL-050UU for this size and a catalog mass of 0.308 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.
Draw the tight-side and slack-side belt forces with their actual directions. Shaft torque depends on the tangential driving effect, while the bearing reaction follows the vector combination of external forces. Using only the difference between belt tensions can therefore understate radial loading.
Include installation pretension even when transmitted power is low. Obtain the required setting and verification method from the belt supplier; excess pretension should not be used to compensate for poor alignment or an unsuitable drive design.
| Drive condition | Input to retain in the bearing review |
|---|---|
| Installed, stationary belt | Pretension and belt-span directions |
| Normal transmission | Tight-side and slack-side tensions |
| Start, stop or reversing load | Peak force and its duration |
| Pulley beyond a support | Overhang and distance between bearing centers |
An overhung pulley produces a bending demand on the shaft and support system. Determine the reactions at each bearing instead of assigning the total force equally by default. A second support can change these reactions, but its location and stiffness must be included in the model.
Request a JU050CP0 review using your belt-force diagram.
| Parameter | KAYDON JU050CP0 reference | LYDL-050UU Sealed Type C listing |
|---|---|---|
| Dynamic radial, Kaydon method / LYDL Cr | 5.378 kN (1,209 lbf) | 6.180 kN; basis not stated in the table |
| Dynamic radial, ISO comparison | 11.161 kN (2,509 lbf) | Not separately stated |
| Static radial | 11.521 kN (2,590 lbf) | 11.520 kN |
| Listed limiting speed | 1,300 rpm, subject to catalog conditions | 1,300 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 LYDL radial dynamic listing and the Kaydon values do not use an established common basis on this page. Keep the columns separate in your calculation file. Matching nominal dimensions and similar static values do not establish equivalent fatigue performance or permitted belt tension.
Treat the listed speed as a catalog boundary with stated conditions, not a complete belt-drive operating envelope. Pulley balance, radial force, lubrication and heat dissipation all remain part of the machine review. Do not apply a Type X axial or moment rating to this Type C reference.
A feed pulley may see light process force during normal travel but a much higher load during a jam or abrupt acceleration. Separate the normal duty used for fatigue assessment from exceptional events that require a static and structural check.
Record whether the drive can reverse and how the tensioner responds. If tension changes with travel or temperature, supply its range rather than a single preferred value. This is an illustrative engineering scenario, not a statement that a particular feed machine has been qualified with this bearing.
Place the belt plane, shaft shoulders and bearing centers on one section drawing. Confirm that the pulley does not touch the seals or retaining hardware through its tolerance range. Show how the hub is removed without pulling installation forces through the balls.
Inspect alignment independently of bearing accuracy. A precisely manufactured bearing cannot correct offset pulleys or a skewed tensioner. If force direction rotates relative to a ring, review the seat fit for that loading condition rather than selecting it solely from which component physically rotates.
| Brand | Verified reference | Meaning and comparison limit |
|---|---|---|
| KAYDON | JU050CP0 | Sealed JU series, radial contact Type C. |
| INA / Schaeffler | CSCU 050.2RS | CSC: deep-groove radial family; U: section series; .2RS: seals on both sides. |
KAYDON uses JU050CP0 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 127 × 146.05 × 12.7 mm envelope. Fits, internal clearance, seals, accuracy and rating methods still require a manufacturer-specific comparison before replacement.
Use the belt manufacturer's approved tension method and record the measurement position. Check rotation and output runout before fitting the belt, after tensioning and under representative drive load. This sequence helps separate seat issues from belt-induced deflection.
For procurement, state the quoted grease, seal material, cage, clearance and bearing accuracy. Agree which checks concern the bare bearing and which belong to the completed pulley module. Preserve the tension setting with the sample report so a later comparison uses the same mechanical conditions.
Not completely. Those inputs can describe transmitted torque, but bearing reaction also depends on belt pretension, span directions and pulley position. Supply the force diagram and support spacing for a meaningful review.
No. Installation pretension can remain substantial when useful output torque is low. Determine the actual belt forces at the relevant operating conditions rather than scaling bearing load directly with process power.
Only a suitable arrangement and calculation can establish the load split. Overhang, spacing, stiffness and other forces affect the reactions. A two-support shaft should not be assessed using an automatic fifty-fifty assumption.
Verify tension and alignment, then inspect shaft and housing deflection under that force. Compare against the untensioned assembly using a consistent test. Do not immediately increase drive torque or loosen the bearing fit.
State the credible peak force, duration, stopping behavior and recurrence. Identify any torque limiter or other load-limiting device. The normal running load and an exceptional jam should remain separate cases in the selection review.
JU040CP0 has a 101.6 mm bore; JU060CP0 has a 152.4 mm bore. These sizes require different hubs and housing seats. Changing diameter alone does not resolve a poor pulley position or an excessive tension setting.
For JU050CP0 / LYDL-050UU, Sealed Type C, send belt tensions, pulley diameter, belt directions, support spacing, overhang, speed and quantity. Request a configuration proposal with the agreed load-rating basis and inspection requirements.
Request the JU050CP0 supply specification and quotation.
These sources document manufacturer reference products and their catalog methods; they are not LYDL certifications.
