Product Overview

The NMT NUP 204 ECPHA is a single-row cylindrical roller bearing with NUP design – featuring two integral flanges on the outer ring, one integral flange on one side of the inner ring, and a loose flange ring on the other side. With a 20 mm bore, 47 mm outer diameter, and 14 mm width, this bearing is manufactured from high-quality bearing steel, equipped with a glass fibre reinforced PEEK (polyether ether ketone) cage (PHA) , and features CN radial clearance (normal group) . It belongs to the SKF Explorer performance class, specifically designed for high radial loads in combination with high speeds, and features a separable design for easy mounting and maintenance. The bearing weighs 0.11 – 0.114 kg (110 – 114 g) .

 

Model Code Decoding – Understanding NMT NUP 204 ECPHA

Code Meaning

NUP Design code – outer ring with two integral flanges, inner ring with one integral flange and one loose flange ring

20 Size series designation

4 Bore size code – 20 mm bore

EC Optimised internal design – accommodates more and/or larger rollers with improved roller end/flange contact for higher load capacity

PHA PEEK cage – outer ring centred, glass fibre reinforced PEEK (polyether ether ketone) material, high temperature resistance, high strength, excellent chemical resistance and high-speed capability

Core Value: The NUP design is the most prominent structural feature of this bearing – the outer ring features two integral flanges, while the inner ring has one integral flange on one side and a loose flange ring on the other. This design enables the bearing to locate the shaft axially in both directions. The PHA cage, made of glass fibre reinforced PEEK (polyether ether ketone) , offers excellent high-temperature resistance (up to 120°C ), high strength, and superior chemical resistance, providing excellent roller guidance accuracy at high speeds. The SKF Explorer performance class represents higher load capacity and extended service life. The separable design allows independent mounting of inner ring, outer ring, and roller assembly, significantly simplifying assembly and maintenance. Logarithmically crowned rollers effectively optimise contact stress distribution between rollers and raceways. The synergy of high radial load capacity, bidirectional axial location, high speed performance, and separable design makes this bearing the ideal precision bearing solution for high-radial-load high-speed rotating equipment.

 

Core Performance Advantages

1. NUP Design – Bidirectional Axial Location Capability

The NUP design is the most complete axial location design among cylindrical roller bearings. The outer ring features two integral flanges, while the inner ring has one integral flange on one side and a loose flange ring on the other. This design enables the bearing to locate the shaft axially in both directions. The loose flange ring ensures flexibility and reliability when the bearing is subjected to bidirectional axial loads. NUP bearings are typically used as locating bearings, providing axial location for the shaft in both directions.

 

2. PEEK Cage (PHA) – High Temperature Resistance, High Strength, High-Speed Durability

This bearing is equipped with a glass fibre reinforced PEEK (polyether ether ketone) cage (PHA) , outer ring centred. PEEK is a high-performance engineering plastic offering:

 

Excellent high-temperature resistance: Operating temperature up to 120°C

 

High strength and rigidity: Glass fibre reinforcement provides superior mechanical strength

 

Superior chemical resistance: Resists attack from a wide range of chemical media

 

Low friction characteristics: Provides excellent roller guidance accuracy at high speeds

 

Dimensional stability: Maintains precise roller guidance across a wide temperature range

 

3. SKF Explorer Performance Class – Higher Load Capacity, Longer Life

This bearing belongs to the SKF Explorer performance class, representing the highest level of SKF's bearing design, material, and manufacturing technology. Compared to standard class bearings, the Explorer class offers higher load capacity, longer service life, and superior operational reliability.

 

4. High Radial Load Capacity – High Load in Compact Space

The line contact design of cylindrical roller bearings provides extremely high radial load carrying capacity. With a basic dynamic load rating of 28.5 kN, static load rating of 22 kN, and fatigue load limit of 2.75 kN, this bearing offers radial load capacity far exceeding ball bearings of the same size.

 

5. High Speed Performance – 17,000 – 24,000 r/min

The optimised internal geometry and low-friction PEEK cage design deliver a reference speed of 17,000 r/min and a limiting speed of 24,000 r/min. The single-row design enables higher speed operation and is suitable for heavy loads and impact loads.

 

6. Separable Design – Easy Installation and Maintenance

The bearing features a separable design – inner ring, outer ring, and roller assembly can be mounted independently, significantly simplifying assembly and maintenance. This allows bearing components to be interchanged, which is particularly important in applications requiring frequent maintenance or component replacement.

 

7. CN Radial Clearance – Ideal for General Applications

CN radial clearance is normal clearance, suitable for most general applications, ensuring stable temperature performance and running accuracy under normal operating conditions.

 

8. Wide Operating Temperature Range

This bearing operates within a temperature range of -30°C to 120°C. The PEEK cage's high-temperature resistance enables the bearing to maintain excellent performance in high-temperature environments.

 

9. Environmentally Compliant

This bearing is compliant with RoHS and REACH environmental standards, with a carbon footprint of 0.36 kg CO₂e.

 

10. Clear Performance Specifications

 

Parameter Value

Bore d 20 mm

Bore Tolerance -0.008mm to 0

Outer Diameter D 47 mm

OD Tolerance -0.009mm to 0

Width B 14 mm

Width Tolerance -0.12mm to 0

Inner Ring Flange Diameter d₁ ≈ 29.7 mm

Outer Ring Flange Diameter D₁ ≈ 38.8 mm

Inner Ring Raceway Diameter F 26.5 mm

Chamfer r₁,₂ min. 1 mm

Chamfer r₃,₄ min. 0.6 mm

Shaft da min. 25 mm

Shaft db min. 31 mm

Housing Da max. 41.7 mm

Max Fillet Radius ra max. 1 mm

Dynamic Load Rating C 28.5 kN

Static Load Rating C₀ 22 kN

Fatigue Load Limit Pu 2.75 kN

Reference Speed 17,000 r/min

Limiting Speed 24,000 r/min

Design Code NUP (outer ring with two flanges, inner ring with one flange + loose flange ring)

Cage Material Glass Fibre Reinforced PEEK (PHA), outer ring centred

Cage Characteristics Non-metallic, glass fibre reinforced, PEEK

Radial Clearance CN (Normal)

Number of Rows 1

Seal Type Open (Unsealed)

Bore Type Cylindrical

Tolerance Class Normal

SKF Performance Class Explorer

Axial Displacement Capability None (bidirectional location)

Weight 0.11 – 0.114 kg (110 – 114 g)

Carbon Footprint 0.36 kg CO₂e

Temperature Range -30°C to 120°C

Typical Applications

The NMT NUP 204 ECPHA, with its NUP design bidirectional axial location capability, PEEK cage high-temperature high-speed performance, and high radial load capacity, covers an exceptionally wide range of high-end applications:

 

Large and Medium Electric Motors – general industrial motors, servo motors

 

Differential Pinion Shafts – automotive transmission systems

 

Gearboxes and Reducers – various industrial reducers

 

Machine Tool Speed Variators – machine tool spindle gearboxes

 

Reducers for Rolling Mill Screws – metallurgical equipment

 

Food and Beverage Equipment – food processing machinery

 

Road Rollers and Scrapers – construction machinery and environmental equipment

 

Agricultural Machinery – various agricultural equipment

 

Pumps and Compressors – high-speed rotating machinery

 

Traction Motors – high radial load and high speed combinations

 

Locating Bearing Arrangements – fixed-end applications requiring bidirectional axial location of the shaft

 

Important Installation Notes

✅ This bearing features NUP design (outer ring with two flanges, inner ring with one flange + loose flange ring), providing bidirectional axial location. Ensure the loose flange ring is correctly installed.

 

✅ This bearing features a separable design – inner ring, outer ring, and roller assembly can be mounted independently, significantly simplifying assembly and maintenance.

 

✅ Ensure shaft and housing fits comply with normal precision class requirements (bore 20 mm, OD 47 mm). Shaft abutment diameter: da min. 25 mm, db min. 31 mm; housing abutment diameter: Da max. 41.7 mm; maximum chamfer radius: ra max. 1 mm.

 

✅ This bearing is unsealed (open design) – select appropriate lubrication method based on application – grease or oil lubrication.

 

✅ This bearing features CN (normal) radial clearance, suitable for most general applications.

 

✅ The PHA cage is made of glass fibre reinforced PEEK, offering excellent high-temperature resistance (up to 120°C ) and chemical resistance.

 

✅ This bearing has no axial displacement capability – the NUP design provides bidirectional axial location and does not permit axial displacement of the shaft relative to the housing.

 

⚠️ Cylindrical roller bearings primarily accommodate radial loads – axial load capacity is limited.

 

⚠️ This bearing has no lubrication groove and no lubrication holes – lubrication must be supplied through an external lubrication system.

 

⚠️ The PHA cage is made of PEEK – avoid contact with sharp tools during installation to prevent cage damage.

 

NMT Quality Commitment

Japan NMT (Enmutī) has deep expertise in the precision bearing industry, with breakthroughs in material purification, process refinement, scenario customisation, and intelligent upgrading, transforming precision bearings into core solutions addressing pain points across multiple industries. The NMT NUP 204 ECPHA bearing is manufactured to strict Japanese quality standards – from ring material (high-purity bearing steel), rollers (logarithmically crowned), to superfinishing processes. The combination of NUP bidirectional location design, PEEK cage (PHA), SKF Explorer performance class, high radial load capacity, and high speed performance makes this bearing the flagship precision bearing in the NMT cylindrical roller bearing series – offering the perfect balance of bidirectional axial location, PEEK high-temperature high-speed performance, and high radial load capacity.

 

Choose NMT NUP 204 ECPHA for:

 

✅ NUP design – bidirectional axial location, ideal for fixed-end applications

 

✅ PEEK cage (PHA) – high temperature resistance, high strength, high-speed durability

 

✅ 28.5 kN high radial load capacity – high load in compact space

 

✅ 24,000 r/min high speed performance – industry-leading

 

✅ Separable design – easy installation and maintenance

 

✅ SKF Explorer performance class – higher load capacity, longer life

 

✅ CN radial clearance – ideal for general applications

 

✅ Wide temperature range – -30°C to 120°C

 

✅ RoHS and REACH compliant

 

✅ Japanese precision manufacturing quality