1 Complete Model & Code Explanation

Model：NU 202 ECP/C3

Code Definition

NU：Outer ring double flanged, inner ring unflanged, inner ring axially floating cylindrical roller bearing

202：Size series designation

EC：Optimized roller profile to reduce edge stress and increase load capacity

P：Glass fiber reinforced polyamide injection molded cage

C3：C3 increased radial internal clearance

Structure: Single row cylindrical roller bearing; inner ring axially floating without built-in axial limit

Supply form: Finished complete rolling bearing, ready for installation; optional HJ angle ring for axial positioning

Important reminder: The inner ring of NU 202 ECP/C3 can move axially relative to outer ring, cannot withstand axial load by itself. HJ angle ring is mandatory if axial positioning is required. Polyamide cage has limited operating temperature range and is not recommended for continuous high temperature service. C3 clearance suits high-temperature rise and interference fit; C0 clearance is preferred for precision low-temperature light-load transmission. Violent impact and forced pressing shall be avoided to prevent cage fracture.

Basic Parameters

Bore d：15 mm

Outer diameter D：35 mm

Width B：11 mm

Minimum chamfer r：0.6 mm

Material：High carbon chromium bearing steel

Cage：Glass fiber reinforced polyamide cage

Internal clearance：C3 increased clearance

Net weight：0.052 kg

Indicative carbon footprint：0.11 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Combination Option

NU202ECP/C3 + HJ202EC = NH202ECP/C3 (cylindrical roller bearing with bidirectional axial locating function)

2 Structure & Operating Characteristics

Japan NMT NU 202 ECP/C3 features integrated double flanges on outer ring and unflanged inner ring. Rolling elements with polyamide cage allow inner ring to slide freely along roller axis, compensating thermal elongation of shaft and eliminating thermal stress. EC optimized roller profile improves stress distribution and inhibits edge pitting.

The bearing mainly carries radial load and cannot support axial force. Lightweight polyamide cage provides low friction and smooth medium-high speed operation with low noise. C3 clearance prevents seizure caused by clearance reduction under interference fit and elevated operating temperature. Not suitable for continuous high temperature, heavy axial shock and dusty unprotected environments.

3 Core Performance Advantages

1. EC optimized roller geometry reduces edge loading, raising load rating and pitting resistance.

2. Glass fiber reinforced polyamide cage delivers smooth rotation, low mass and quieter medium-high speed operation.

3. NU floating structure automatically absorbs shaft thermal expansion and prevents bearing seizure.

4. Standard C3 radial clearance matches interference assembly and high temperature rise industrial drives.

5. Fully hardened precision ground bearing steel raceways, stable dimensional accuracy and good interchangeability.

6. Easy to combine with HJ angle ring to convert floating bearing into axially fixed NH bearing unit.

4 Typical Application Fields

4.1 General Power Equipment

Small three-phase asynchronous motors, variable frequency motor rotor supports

4.2 Reduction Drives

Small gear reducers, worm reducer high/low speed shafts

4.3 Fluid & Conveying Equipment

Centrifugal fans, blowers, light-duty belt conveyors

4.4 Light Industry Machinery

Textile machinery, small air compressors, packaging machine transmission shafts

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly area clean without metal debris. Apply pressing force on inner ring end face; never transmit pressure via outer ring. Polyamide cage cannot withstand open flame or extreme heating; maximum mounting temperature ≤120℃. After installation verify free axial sliding of inner ring without sticking.

5.2 Selection Guidance

High operating temperature rise + interference fit → NU202ECP/C3 C3 clearance

Axial positioning required → add HJ202EC angle ring for NH configuration

Continuous working temperature over 120℃ → switch to brass cage version

5.3 Lubrication Instruction

Lithium grease or circulating oil lubrication are applicable. Conduct low-speed running-in for 2~4 hours after initial start. Regular replenishment of lubricant is required to avoid overheating and cage damage under dry friction.

5.4 Environmental Application Notes

Polyamide cage lacks resistance to high temperature and chemical corrosion. Sealing protection is necessary for humid or acidic/alkaline conditions. Brass cage variant is recommended under heavy continuous impact loads.

6 Daily Maintenance & Fault Troubleshooting

Perform no-load low-speed running-in after assembly; monitor temperature rise, vibration and abnormal noise. Common failures: raceway fatigue spalling, cage abrasion & fracture, roller edge pitting.

Typical causes: improper assembly force, excessive heating damaging polyamide cage, insufficient lubrication, incorrect clearance selection, foreign particles entering raceway. Bearings with broken cage or extensive spalling cannot be repaired and must be replaced.