1 Model Information & Technical Parameters

Model：NUP 204 ECPHA

Dimensions

Bore d：20 mm

Outer diameter D：47 mm

Width B：14 mm

Performance Data

Basic dynamic load rating Cr：28.5 kN

Basic static load rating C0r：22 kN

Reference speed：17000 r/min

Limiting speed：24000 r/min

Performance grade: Equivalent to Explorer high performance bearing

Technical Attributes

Supply form: Complete bearing unit

Number of roller rows: Single row

Axial displacement capability: None (double-way locating bearing)

Outer ring feature: Without snap groove

Bore type: Cylindrical bore

Cage: PHA carbon fiber reinforced PEEK, outer ring centered window cage

Outer ring flanges: 2

Inner ring flange: 1 fixed flange + detachable loose rib

Coating: None

Seal: Open type, no seal

Pre-grease: None

Relubrication facility: None

Logistics & Industry Codes

Net weight：0.11 kg

Indicative carbon footprint：0.22 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

EC: Optimized internal geometry, improved roller end/flange contact, reduced edge stress and extended service life;

PHA: Carbon fiber reinforced PEEK window cage, outer ring guided, excellent high temperature resistance and low friction for higher rotational speed;

NUP design: Outer ring double flanges; inner ring fitted with fixed flange plus loose rib, enables bidirectional axial restriction by single bearing.

Important reminder: The bearing is separable. Ensure loose rib is fully seated during assembly; impact deformation must be avoided. PEEK cage operating temperature range -30～+180℃, better than standard polyamide cage. Avoid highly polar aggressive lubricants. Open structure requires housing sealing against dust and moisture. If NUP bearings are installed on both shaft ends, thermal expansion of shaft will induce extra axial preload, temperature rise must be verified in design.

2 Structure & Operating Characteristics

Japan NMT NUP 204 ECPHA high-performance NUP single row cylindrical roller bearing adopts EC optimized roller profile to relieve contact stress and restrain edge spalling and pitting. Matched with PHA carbon fiber reinforced PEEK outer ring centered cage, it provides precise guidance, low friction and higher limiting speed, suitable for continuous high-speed operation.

Core advantage of NUP construction: one single bearing works as double-fixed locating support, eliminating the need for paired locating bearings and simplifying shaft layout. Separable construction allows independent fitting of inner and outer rings for interference fit applications. It bears radial load plus limited bidirectional axial load, not suitable for heavy pure axial load.

3 Core Performance Advantages

1. EC optimized roller geometry balances contact stress, cuts frictional heat and extends service life, reaching Explorer high performance standard.

2. PHA carbon fiber reinforced PEEK cage features high temperature resistance, light weight and anti-creep property; higher limiting speed compared with polyamide or pressed steel cage.

3. NUP bidirectional locating structure restricts shaft axial movement in both directions with only one bearing unit, simplifying transmission layout.

4. Bearing steel rings with precision heat treatment deliver outstanding contact fatigue strength for sustained medium-high radial loads.

5. Separable structure facilitates assembly and disassembly, ideal for equipment where both inner and outer rings require interference fit.

6. Coating-free open design compatible with mineral oil, synthetic oil and standard industrial greases.

4 Typical Application Fields

4.1 Gear Transmission Equipment

Small precision gear reducers, servo reducer input/output shaft bidirectional locating support

4.2 Fluid Power Equipment

Industrial centrifugal fans, blowers, screw air compressor main shaft support

4.3 Electric Motors

Medium-small variable frequency motors, high-speed general purpose motor rotor locating point

4.4 Light General Machinery

Conveyor rollers, packaging machinery, small machine tool transmission shafts

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain clean assembly area free of metal chips and burrs. Apply pressing force only on ring end faces; never strike roller assembly or loose rib directly. Rotate bearing manually after assembly to confirm smooth rotation without sticking or abnormal noise. Loose rib (spare part HJ204) cannot be used for other bearing series.

5.2 Selection Guidance

Single support point needs bidirectional axial positioning, high speed & wide temperature range → NUP 204 ECPHA

Only one-way axial positioning required → prefer NJ series bearings

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery; fill grease sufficiently during assembly. Circulating oil lubrication recommended for high-speed operation. Set regular regreasing cycle according to load and rotating speed; dry friction operation is prohibited.

5.4 Environmental Application Notes

No anti-rust coating. Apply anti-rust oil and seal for long-term storage. Improve housing sealing under humid, dusty or slightly corrosive conditions. Prevent contact with strong acid, alkali and polar solvents to avoid PEEK cage degradation.

6 Fault Identification

Common failure modes: raceway fatigue spalling, roller end pitting, loose rib impact deformation, cage creep under heat, overheating discoloration. Bearings with permanent deformation, extensive pitting or cracked cage must be fully replaced immediately.