1 Complete Model & Code Explanation

Model：NU 202 ECP

Code Definition

NU：Single row cylindrical roller bearing with double flanges on outer ring, unflanged inner ring, inner ring bidirectional axially floating

202：Size series designation

EC：Optimized roller profile, reducing edge stress concentration, increasing load capacity and pitting resistance

P：Glass fiber reinforced polyamide injection molded cage

No clearance suffix = CN standard radial clearance

Structure: Separable inner and outer rings; no built-in axial limit, applied as shaft floating end

Supply form: Complete finished bearing; optional HJ202EC angle ring for bidirectional axial positioning

Important reminder: NU 202 ECP cannot bear axial load independently, only suitable for floating support end. HJ202EC angle ring must be installed if axial positioning is required. Continuous operating temperature of polyamide cage shall not exceed 120℃; brass cage version for high temperature service. Mounting temperature shall not exceed 120℃, open flame heating is prohibited. Assembly force must not pass through rolling elements to avoid cage damage. Ideal for transmission layout requiring large axial compensation for shaft thermal elongation.

Basic Parameters

Bore d：15 mm

Outer diameter D：35 mm

Width B：11 mm

Minimum chamfer r：0.6 mm

Inner ring raceway diameter F：19.3 mm

Basic dynamic load rating C：12.5 kN

Basic static load rating C₀：10.2 kN

Reference speed：22000 r/min

Limiting speed：26000 r/min

Material：High carbon chromium bearing steel

Cage：Glass fiber reinforced polyamide cage

Radial clearance：CN standard clearance

Net weight：0.050 kg

Indicative carbon footprint：0.11 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Combination Scheme

NU202ECP + HJ202EC = NH202ECP (Cylindrical roller bearing unit with bidirectional axial locating)

2 Structure & Operating Characteristics

Japan NMT NU 202 ECP adopts integrally formed double flanges on outer ring and unflanged inner ring. The rolling assembly with polyamide cage allows the inner ring to slide freely along the axis, fully absorbing thermal elongation caused by temperature rise and eliminating thermal stress of shaft system.

EC optimized roller shape improves load distribution, relieves stress concentration at both ends of raceway and delays fatigue pitting. Lightweight polyamide cage features low friction, low vibration and quiet operation under medium-high speed. The bearing only withstands radial loads. Normally matched with NJ one-way locating bearing: NJ as fixed end and NU as floating end to form standard two-point supporting shaft system. Not suitable for conditions with continuous axial force and frequent axial impact.

3 Core Performance Advantages

1. EC optimized roller geometry lowers edge loading, lifting load rating and raceway service life.

2. Glass fiber reinforced polyamide cage reduces running resistance for stable and quieter medium-high speed operation.

3. NU floating structure compensates large-scale shaft thermal elongation and prevents bearing seizure from thermal expansion.

4. CN standard radial clearance fits most normal-temperature general machinery with strong universality in selection.

5. Separable inner and outer rings simplify disassembly, convenient for equipment maintenance and individual bearing replacement.

6. Compatible with HJ202EC angle ring to switch positioning mode flexibly, meeting floating support and bidirectional limit demands.

4 Typical Application Fields

4.1 Power Motor Equipment

Floating support pivot for small asynchronous motors and variable frequency motors

4.2 Gear Reduction Devices

Floating end bearing for small gear reducers and worm reducers

4.3 Fluid Machinery

Floating main shaft support for centrifugal fans, blowers and small air compressors

4.4 Light Industry General Machinery

Transmission shafts of textile machinery, packaging machinery and light belt conveyors

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly area clean and free of metal debris. Apply pressing force directly on inner ring end surface; never transmit pressure via outer ring or rollers. Max assembly temperature ≤120℃ to avoid polyamide cage damage. After assembly check free smooth axial sliding of inner ring without jamming.

5.2 Selection Guidance

Obvious temperature rise and thermal elongation compensation required → NU202ECP (floating end)

One-side shaft limit needed → pair with NJ202ECP locating bearing

Bidirectional axial positioning required → NU202ECP + HJ202EC for NH configuration

Continuous temperature above 120℃ → switch to brass cage version

5.3 Lubrication Maintenance Instruction

Applicable for lithium grease or circulating oil lubrication. Perform low-speed no-load running-in for 2~4 hours after startup. Replenish lubricant periodically and prohibit long-term dry friction operation.

5.4 Environmental Application Notes

Polyamide cage is not resistant to acid and alkali corrosion. Enhance housing sealing under dusty and humid conditions. Not recommended for independent use with continuous axial impact loads.

6 Daily Maintenance & Fault Troubleshooting

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

Typical failure causes: improper assembly force, excessive mounting temperature, insufficient lubrication, hard foreign matter entering raceway. Bearings with broken cage or extensive raceway spalling cannot be repaired and shall be replaced directly.