Product Overview

The NMT BC1B 320811 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 17 mm bore, 37 mm outer diameter, and 14 mm width, this bearing is manufactured from high-quality bearing steel, equipped with a non-metallic cage, 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 only 0.068 kg (68 g) .

 

Model Code Decoding – Understanding NMT BC1B 320811

Code Meaning

BC1B Basic series designation – SKF-specific cylindrical roller bearing series identifier

320811 Size/design code – 17 mm bore, 37 mm OD, 14 mm width

NUP design Outer ring with two integral flanges, inner ring with one integral flange and one loose flange ring on the other side

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 separable design allows independent mounting of inner ring, outer ring, and roller assembly, significantly simplifying assembly and maintenance. The SKF Explorer performance class represents higher load capacity and extended service life. The non-metallic cage provides excellent wear resistance and high-speed performance. 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 (live flange) 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.

 

2. 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.

 

3. 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 19 kN and static load rating of 16.6 kN, this bearing offers radial load capacity far exceeding ball bearings of the same size.

 

4. High Speed Performance – 20,000 – 24,000 r/min

The optimised internal geometry and low-friction non-metallic cage design deliver a reference speed of 20,000 r/min and a limiting speed of 24,000 r/min. The single-row design enables higher speed operation.

 

5. 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 is particularly important in applications requiring frequent maintenance or component replacement.

 

6. Non-Metallic Cage – Speed and Wear Resistance Combined

The non-metallic cage offers excellent wear resistance and self-lubricating properties. The non-metallic cage significantly reduces rotational friction, improving efficiency and extending bearing life. It requires minimal maintenance.

 

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. Lightweight Design – Only 68 Grams

The bearing weighs only 0.068 kg (68 g) , adding minimal burden to rotating assemblies.

 

9. Environmentally Compliant

The bearing has a carbon footprint of 0.25 kg CO₂e, demonstrating a commitment to sustainable development.

 

10. Clear Performance Specifications

 

Parameter Value

Bore d 17 mm

Outer Diameter D 37 mm

Width B 14 mm

Dynamic Load Rating C 19 kN

Static Load Rating C₀ 16.6 kN

Reference Speed 20,000 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 Non-Metallic

Radial Clearance CN (Normal)

Number of Rows 1

Seal Type Open (Unsealed)

Bore Type Cylindrical

Bearing Material Steel

SKF Performance Class Explorer

Axial Displacement Capability None (bidirectional location)

Weight 0.068 kg (68 g)

Carbon Footprint 0.25 kg CO₂e

Temperature Range -30°C to +120°C

Typical Applications

The NMT BC1B 320811, with its NUP design bidirectional axial location capability, high radial load capacity, and high speed performance, covers an exceptionally wide range of high-end applications:

 

Gearboxes – industrial gearboxes, reducers requiring bidirectional axial location

 

Electric Motors – general industrial motors, servo motors

 

Pumps and Compressors – high-speed rotating machinery

 

Traction Motors – high radial load and high speed combinations

 

Industrial Fans – high-speed, high-radial-load applications

 

Material Handling Equipment – conveyors, hoists

 

Automation Equipment – industrial automation machinery

 

Machine Tool Spindles – high-precision rotating equipment

 

Automotive Components – components requiring robust load capacity

 

Hydraulic Pump Transmission Bearings – hydraulic systems

 

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 17 mm, OD 37 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.

 

✅ 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 non-metallic cage should be protected from contact with sharp tools during installation to prevent 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 BC1B 320811 bearing is manufactured to strict Japanese quality standards – from ring material (high-purity bearing steel) and rollers to superfinishing processes. The combination of NUP bidirectional location design, SKF Explorer performance class, non-metallic cage, 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, high radial load, and high speed performance.

 

Choose NMT BC1B 320811 for:

 

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

 

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

 

✅ 19 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

 

✅ Non-metallic cage – speed and wear resistance combined

 

✅ CN radial clearance – ideal for general applications

 

✅ Lightweight design – only 68 g

 

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

 

✅ Japanese precision manufacturing quality