X&S NU312 NU313 NU314 NU315 NU316 NU317 NU318 NU319 Cylindrical Roller Bearing for Auto Parts

Batch-Level Traceability — Every X&S NU312 NU313 NU314 NU315 NU316 NU317 NU318 NU319 cylindrical roller bearing ships with verifiable lot documentation linking directly to the manufacturer’s production facilities.

Technical Specifications

Note: The NU prefix, dimension series 3, and bore codes 12 through 19 follow standard ISO conventions for cylindrical roller bearings, though specific internal geometry suffixes require manufacturer catalog confirmation for exact application matching.

Application Suitability

Why Base-Number Matching Fails in the Field

Identical outer dimensions do not guarantee identical internal clearances or cage dynamics.

Procurement engineers often source replacements by matching the base designation alone, overlooking critical suffixes. When a standard clearance bearing is forced into a high-temperature gearbox application meant for a C3 clearance variant, thermal expansion eliminates the internal gap. This leads to severe thermal binding and catastrophic cage failure. We frequently see field returns where the physical dimensions were perfect, but the internal design caused unplanned downtime within weeks of installation [NEED_CITE: rolling bearing failure mode classification per ISO 15243].

Matching the X&S NU312 NU313 NU314 NU315 NU316 NU317 NU318 NU319 Cylindrical Roller Bearing to Your Operating Environment

Selecting the right variant from this series requires looking beyond the catalog number. Our technical team reviews your specific radial loads, operating speeds, and thermal profiles to ensure the selected precision class and cage material align with the actual working environment. This prevents the common pitfall of installing a P0 grade component in an application that demands P5 or P6 running accuracy to maintain acceptable vibration levels.

Operational Demands on Single Row Radial Supports

These components primarily handle heavy radial loads while accommodating minor axial displacements through their separable design. In electric motors and gearboxes, rotational speeds generate significant friction heat, making the choice between steel and nylon cages critical for maintaining stability. Proper lubrication intervals must be established based on the operating temperature, as excessive heat degrades grease and accelerates wear. Furthermore, the absence of integrated seals in open variants demands rigorous external contamination control to prevent abrasive particles from entering the roller pathways [NEED_CITE: impact of particle contamination on bearing fatigue life per ISO 281].

Decoding the NU Series Designation and Internal Architecture

The "NU" designation indicates a bearing with two flanges on the outer ring and none on the inner ring, allowing it to accommodate axial displacement in both directions. The "3" denotes a medium-wide dimension series, balancing radial load capacity with cross-sectional space constraints. The trailing numbers (12 through 19) specify the bore diameter code, scaling from 60 mm up to 95 mm. The separable architecture means the inner ring can be mounted with a tight interference fit on the shaft, while the outer ring and roller assembly slide into the housing, vastly simplifying installation in tight gearbox enclosures.

The Hidden Costs of Overlooking Suffix Details

Ignoring the precise cage material or clearance class during cross-referencing leads to premature failure. A stamped steel cage might fracture under the high-speed vibrations of an electric motor if a machined brass or reinforced polyamide variant was specified by the OEM. Such mismatches result in catastrophic damage to the shaft and housing, voiding equipment warranties and triggering expensive emergency repairs. Aligning the exact internal geometry prevents these compounding financial losses.

Why Engineering Verification Matters for This Series

Sourcing the X&S NU312 NU313 NU314 NU315 NU316 NU317 NU318 NU319 cylindrical roller bearing through authorized channels ensures you receive components with verified metallurgical properties. Our cross-brand interchange process strictly aligns the base number, internal clearance, and cage material, rather than just matching the outer envelope dimensions. We provide application-based selection reviews that account for thermal expansion and mounting tolerances, ensuring the chosen variant survives the actual operational stresses rather than just looking correct on paper.

Documentation & Authenticity

• Certificate of Conformity confirming ISO and CE compliance for the specific batch.
• Batch and lot traceability linking each component to the original manufacturing run.
• QR verification via brand official apps to eliminate soft inner ring counterfeits.
• Material test report validating the high-carbon chrome or stainless steel composition.
• Dimensional and running accuracy inspection report verifying P0, P5, or P6 tolerances.
• Country-of-origin documentation for customs and supply chain transparency.

Storage, Handling & Mounting Protocols

• Store the separable inner rings in original VCI packaging to prevent surface corrosion before shaft mounting.
• Use induction heating for the inner rings to achieve the necessary thermal expansion for interference fits without damaging the raceway.
• Keep nylon cage variants away from direct UV exposure and ozone sources to prevent polymer degradation.
• Ensure clean mounting environments for P5 and P6 precision classes to avoid particulate indentation on the rollers.
• Handle stainless steel variants with dedicated tools to prevent carbon steel cross-contamination and subsequent localized rusting.

Pre-Purchase Technical Alignment

To ensure the selected variant meets your operational demands, provide your radial and axial load profiles, continuous and peak rotational speeds, and expected operating temperature ranges. Supplying the OEM equipment number or the exact dimensions of the housing and shaft allows our engineering team to perform a precise cross-reference check and L10 life calculation, guaranteeing the recommended configuration matches your mechanical requirements.

Frequently Asked Questions

Q: Why must clearance and cage material align with the base designation during cross-referencing?
A: Matching only the base number ignores internal geometry. A standard clearance bearing in a high-heat environment will experience thermal binding, while an incorrect cage material may fracture under specific vibration frequencies. Aligning all three parameters ensures the replacement survives the actual operational stresses without causing secondary damage to the shaft or housing.

Q: What are the operational boundaries for steel versus nylon cages in this series?
A: Stamped steel cages offer high mechanical strength and tolerate elevated temperatures, making them suitable for heavy-load gearboxes. Nylon cages provide lower friction, reduced noise, and better performance at higher speeds, which is ideal for electric motors. The choice depends entirely on the specific thermal and rotational demands of your application.

Q: How do P0, P5, and P6 precision classes affect high-speed motor performance?
A: Higher precision classes like P5 and P6 feature tighter tolerances on dimensional and running accuracy. This reduces radial runout and vibration at high speeds, which is critical for electric motors and machine tool spindles to maintain low noise levels and prevent premature fatigue. P0 is generally sufficient for standard industrial gearboxes.

Q: What do the numerical suffixes like 312 or 319 indicate in the NU series?
A: The first digit indicates the dimension series, defining the cross-sectional width and diameter relative to the bore. The last two digits represent the bore diameter code. For example, multiplying the code by five yields the inner diameter in millimeters, allowing engineers to quickly identify the physical envelope size of the component.

Q: How should the separable inner ring be mounted on a tight interference shaft?
A: The inner ring should be heated using an induction heater to expand it sufficiently for a smooth slide onto the shaft journal. This prevents the need for excessive mechanical force, which could damage the precision-ground raceway or alter the internal geometry before the outer ring and roller assembly are even introduced.