1 Model Information & Technical Parameters

Model：NUP 2203 ECP

Dimensions

Bore d：17 mm

Outer diameter D：40 mm

Width B：16 mm

Performance Data

Basic dynamic load rating C：27.5 kN

Basic static load rating C₀：21.6 kN

Reference speed：20000 r/min

Limiting speed：22000 r/min

Equivalent performance grade：SKF Explorer

Technical Attributes

Supply form: Complete bearing

Number of rows: Single row

Bore type: Cylindrical bore

Outer ring flanges: 2

Inner ring flanges: 1

Inner ring feature: Inner ring loose flange (detachable loose rib)

Outer ring locating flange: None

Axial displacement capacity: None (double-way axial locating, no floating allowance)

Cage: Glass fiber reinforced polyamide non-metallic cage

Radial clearance: CN standard clearance

Tolerance class: Normal standard tolerance

Coating: None

Seals: None

Pre-grease: None

Relubrication facility: None

Logistics & Industry Codes

Net weight：0.097 kg

Indicative carbon footprint：0.36 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Model Description

NUP type is double-direction locating cylindrical roller bearing. The outer ring has double flanges, the inner ring is equipped with one fixed flange and another independent detachable loose rib. This structure achieves bidirectional axial restriction, one single bearing can sustain axial loads in both directions. EC optimized rollers improve contact condition and reduce edge stress to reach Explorer high performance level. Polyamide cage features low weight and low friction for continuous medium-high speed operation. Inner and outer rings are separable for easy disassembly. Pay attention to installation direction of loose rib during assembly; wrong installation or missing rib will cause malfunction.

Important reminder: This bearing features double-way axial locating capacity. Single bearing can restrict bidirectional shaft displacement. If NUP bearings are adopted on both shaft ends, thermal elongation of shaft will generate extra axial preload and lead to excessive temperature rise, which must be checked in design. Continuous operating temperature limit for polyamide cage ≤120℃. Open flame heating is forbidden; mounting temperature shall not exceed 120℃. Assembly force cannot act on roller and cage assembly to avoid cage fracture. Open bearing without built-in seals, housing sealing structure is required to block dust and moisture. Loose rib is precision component; deformation caused by impact will lead to bearing sticking.

2 Structure & Operating Characteristics

Japan NMT NUP 2203 ECP single row cylindrical roller bearing adopts classic NUP design. Double outer ring flanges guide rollers; inner ring has one fixed flange plus detachable loose rib to form bidirectional axial limiting structure, capable of supporting radial loads and bidirectional axial loads.

EC optimized roller geometry balances contact stress and restrains premature pitting and spalling on raceway edge, achieving Explorer-level load capacity and service life. Glass fiber reinforced polyamide cage delivers low friction, minor vibration and good temperature control under high rotating speed. Separable components simplify assembly and maintenance inside housing. Open non-sealed structure relies on external oil seals and end covers to maintain clean lubrication environment.

Typical layout: Single NUP2203ECP works as direct double-fixed support for shaft system. If large thermal elongation exists, avoid NUP bearings on both ends; recommended layout: one end NUP for locating, the other end NU floating bearing for thermal expansion compensation.

3 Core Performance Advantages

1. EC optimized roller profile balances raceway load distribution, reduces edge stress, matches SKF Explorer grade load capacity and service life.

2. Unique NUP double-way locating structure enables one single bearing to withstand bidirectional axial loads, simplifying main shaft support layout and reducing bearing quantity.

3. Glass fiber reinforced non-metallic polyamide cage lowers running resistance with better vibration and noise performance under medium-high speed.

4. CN standard radial clearance provides wide universality for most general transmission machinery under normal temperature and moderate load.

5. Separable inner and outer rings facilitate disassembly and assembly, suitable for integrated installation inside reducers and fan housings.

6. Detachable built-in loose rib enables flexible spare part replacement and convenient axial clearance adjustment on site.

4 Typical Application Fields

4.1 Gear Transmission Equipment

Double-direction locating support for small gear reducers and servo reducers

4.2 Fluid Power Equipment

Fixed main shaft support of centrifugal fans, blowers and small air compressors

4.3 Industrial Motor Equipment

Main shaft support for medium & small asynchronous motors and variable frequency motors

4.4 Light Industry General Machinery

Transmission shafts of textile machinery, packaging equipment and light roller conveyors

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly workshop clean without metal chips and hard dust. Apply pressing force only on end faces of inner or outer ring; avoid striking roller assembly and loose rib. Max heating temperature for mounting is limited to 120℃ to prevent softening and deformation of polyamide cage. After assembly, confirm loose rib is fully seated without jamming; rotate bearing manually to ensure smooth operation.

5.2 Selection Guidance

Single support point requires bidirectional axial restriction and bidirectional axial force → NUP 2203 ECP

Large shaft thermal elongation requiring axial compensation space → one end NUP locating, the other end NU floating bearing

Only one-way axial positioning needed → prefer NJ series bearing

Continuous operating temperature higher than 120℃ → select version with solid brass cage

5.3 Lubrication Maintenance Instruction

Compatible with lithium grease and circulating oil lubrication. Conduct low-speed no-load running-in for 2~4 hours before formal operation. No pre-filled lubricant supplied; sufficient lubricant must be injected during assembly. Replenish lubricant regularly according to load and rotating speed; prohibit long-term dry friction on rolling surfaces.

5.4 Environmental Application Notes

Polyamide cage has weak resistance against acid and alkali. Without factory fitted seals, reinforce housing sealing under dusty and humid conditions. Deformation of loose rib caused by impact will lead to stiff rotation; protect loose rib carefully during handling and assembly.

6 Daily Maintenance & Fault Troubleshooting

Monitor temperature rise, vibration and abnormal noise during running-in. Common failure modes: raceway fatigue spalling, roller edge pitting, cage abrasion & fracture, sticking caused by deformed loose rib, surface scuffing due to insufficient lubrication.

Typical failure causes: cage and loose rib damaged by assembly impact, overheating during mounting, lack of lubricant, hard foreign particles entering raceway, improper installation of loose rib. Bearings with broken cage, extensive raceway spalling or permanently deformed rib cannot be repaired and shall be replaced immediately.