JU120CP0 sealed radial contact bearing has a 304.8 × 323.85 × 12.7 mm envelope and corresponds to LYDL-120UU in the Sealed Type C series. For a large drum or annular carrier, calculate reactions from support spacing, overhang and the complete load path. The twelve-inch bore does not make this a bolt-mounted slewing bearing. Send the assembly section and load cases for a LYDL configuration proposal.
JU120CP0 sealed radial contact bearing is a twelve-inch reference measuring 304.8 × 323.85 × 12.7 mm. Its large bore and thin section can be useful when evaluating a drum or annular component supported primarily by radial bearing reactions.
The support layout matters as much as the catalog size. The position of the drum’s center of gravity, the drive and the process force determines how loads reach each bearing and the surrounding structure.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 12.000 | 304.800 |
| Outside diameter, D | 12.750 | 323.850 |
| Width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
The radial section remains 9.525 mm despite the 304.8 mm bore, and the axial width is 12.7 mm. Provide support along the intended ring seats; do not infer structural rigidity from the bore diameter or assume the ring includes mounting-bolt features.
The LYDL Sealed Type C parameter table lists LYDL-120UU for this size and a catalog mass of 0.708 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.
Show every external force and its distance from the bearing centers. Include drum weight, payload, drive forces and process contact. Establish whether each force acts between the supports or beyond them. An overhung force can create a reaction at one support that exceeds the force itself, with an opposing reaction at the other support.
Do not divide total weight equally between two bearings unless the geometry and loading justify it. A changing payload position or an eccentric process force can produce a different distribution through the operating cycle. Review empty, nominal and maximum-load states separately.
| Layout feature | Effect to evaluate |
|---|---|
| Support spacing | Reaction distribution and structural deflection |
| Drum overhang | Bending demand and opposing support reactions |
| Drive position | Additional radial force and its load path |
| Moving payload | Variation in load magnitude and direction |
Resolve the overturning demand through the complete arrangement. A Type C radial rating is not a standalone moment-load rating. If the design requires one bearing to provide the complete moment restraint, reconsider the support concept or evaluate a bearing type intended for that duty.
Request a JU120CP0 review with the complete drum load diagram.
| Parameter | KAYDON JU120CP0 reference | LYDL-120UU Sealed Type C listing |
|---|---|---|
| Dynamic radial, Kaydon method / LYDL Cr | 8.781 kN (1,974 lbf) | 8.780 kN; basis not stated in the table |
| Dynamic radial, ISO comparison | 15.200 kN (3,417 lbf) | Not separately stated |
| Static radial | 26.467 kN (5,950 lbf) | 26.470 kN |
| Listed limiting speed | 540 rpm, subject to catalog conditions | 540 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 dynamic listing is approximately equal to the converted Kaydon-method value after rounding. This numerical proximity does not establish interchangeable performance. Keep the ISO comparison rating separate and obtain confirmed LYDL supply data before approving the drum support.
No INA / Schaeffler CSCU 120.2RS entry was confirmed in the reviewed sealed U-series table. Accordingly, this page lists only the verified Kaydon reference rather than inventing a same-size INA designation. An open bearing with a similar number is not a substitute for a verified sealed Type C configuration.
A drum may carry most of its mass between two supports while receiving a process force near one end. The support nearest the working zone can then see a substantially different reaction from the other bearing. Adding a drive belt at the opposite end introduces another load case, not an automatic balancing effect.
Specify allowable deflection where the drum performs its function. Bearing capacity, shaft bending and housing stiffness must be evaluated together. The example describes a review method and provides no guaranteed load or stiffness for an assembled LYDL drum.
Decide which part of the arrangement locates the drum axially and how relative movement is accommodated elsewhere. A radial support layout does not eliminate axial forces introduced by a helical drive, gravity in a vertical arrangement or a process attachment.
The ring seats and retaining faces must match the approved drawing. Check corner clearance and avoid contact between covers and seals. Support the fitted ring during installation and use controlled alignment; a retaining cover should not be used to force an unexplained interference into place.
KAYDON uses JU120CP0 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.
A manufacturer reference number helps identify a catalog configuration; it does not certify the LYDL product’s materials, tolerances or performance. Specify the actual supply conditions on the order drawing.
Define the displacement or runout limit at the functional surface, with the specified load and support conditions. A measurement at the bearing seat alone does not demonstrate compliance at an overhanging drum edge. Record the measurement location and force direction with the result.
For procurement, separate bare-bearing inspection from assembled-machine acceptance. Agree materials, seals, lubricant, cage, internal clearance and confirmed rating basis. Preserve the support-spacing and load-case revision alongside the quotation so an altered machine layout triggers a fresh review rather than reuse of an obsolete approval.
Do not assume that it can. The separated supports provide a particular reaction system and moment restraint. A single radial contact bearing needs a new arrangement assessment, including deflection and any axial or moment demand.
The two supports react both force and the effect of the overhang. One reaction can increase while the other acts in the opposite direction. Use equilibrium for the actual geometry rather than splitting the weight equally.
It changes the reaction and bending arrangement but is not a universal cure. Shaft stiffness, housing stiffness, load position and practical constraints also matter. Evaluate deflection at the working surface for the revised layout.
Not necessarily. Gravity may create a significant axial load, and process or drive forces can add further components. Identify the axial support and verify its suitability instead of relying only on the radial rating.
No. This thin section reference does not establish bolt holes, a geared ring or the stiffness of a slewing bearing. Compare section geometry, mounting features and complete load paths before considering a different bearing architecture.
JU100CP0 has a 254 mm bore and JU080CP0 has a 203.2 mm bore. They may suit a different drum architecture, but neither fits the same seats. Compare space and support reactions before selecting a nominal diameter from the series range.
Identify JU120CP0 reference / LYDL-120UU / Sealed Type C. Include support spacing, drum mass, payload positions, drive forces, speed, required output deflection and quantity. Ask for a drawing review and a quotation tied to those load cases.
Request the JU120CP0 supply specification and quotation.
These sources document manufacturer reference products and their catalog methods; they are not LYDL certifications.
