NK 21/20

NK 21/20 · Product image

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NK 21/20 · Technical drawing

Brand
QIBR
Alternative brand
SKF
Rolling element type
Roller
Measurement system
Metric
Precision level
P0(RBEC-1）
Inner envelope circle
21 mm
Outer diameter
29 mm
Total width
20 mm
Chamfer dimension
0.3 mm
Basic dynamic load rating
17.2 kN
Basic static load rating
27 kN
Fatigue load limit
3.35 kN
Reference speed
19000 rpm
Limiting speed
22000 rpm
Weight
0.035 kg
Temperature
-20 °C to +110 °C
Seal type
Open Type

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Description

Machined outer ring needle roller bearings without inner ring are a good choice for compact bearing arrangements. Compared with bearing arrangements with inner rings, they can form bearing arrangements with larger shaft diameters and higher rigidity.

QIBR - NK 21/20 Needle Roller Bearing Advantages and Applications

QIBR - NK 21/20 Needle Roller Bearing Characteristics

NK 21/20 Needle Roller Bearing, long life, low production cost, high cost performance. NK 21/20 Needle Roller Bearing, can withstand radial load and small unidirectional axial load, suitable for mechanical equipment with high stability requirements.

NK 21/20 Needle Roller Bearing Features and Advantages

High load capacity: Needle bearings can withstand significant axial and radial loads, making them suitable for various heavy machinery and equipment.

High Precision: The manufacturing precision of needle bearings is high, with low rotational inertia, enabling high-precision operation.

Low Friction Coefficient: With a low friction coefficient, needle bearings effectively reduce frictional resistance during operation, minimizing energy loss.

Compact Structure and Lightweight: The overall structure is compact and lightweight, making it suitable for support structures with limited radial installation space.

Application: Needle roller bearings have a wide range of applications in industries such as automotive, aerospace, industrial machinery, construction and agricultural equipment, home appliances, shipbuilding, and medical devices.

QIBR - NK 21/20 Needle Roller Bearing Optimization

Structural Optimization: Adjusting the arrangement of needles or the contact angle based on customer requirements and bearing operating conditions.

Cage Material: Material selection for the cage can be customized based on customer needs, including low carbon steel, stainless steel, PA66, etc.

High-Performance Materials: Choosing suitable materials based on customer requirements, such as DC03M, C15Mn, 16MnCr5, etc.

Heat Treatment: Carburizing or carbonitriding and quenching treatment of the outer ring and cage according to the bearing's operating conditions.

More customization: QIBR can design and optimize bearings based on customer operating conditions and requirements.

QIBR - NK 21/20 Needle Roller Bearing Quality Control

Dimension measurement: Using various high-precision instruments to measure multiple dimensions of the bearings, achieving a maximum precision of 0.001mm.

Rotation accuracy: Measuring small defects or deviations on the bearing surface with a micrometer, with a measurement precision of up to 0.001mm.

Hardness measurement: Surface hardness is measured using a hardness tester, with an accuracy of ±0.5HRC.

Metallographic analysis: Internal metallographic structure is analyzed using a professional metallographic microscope.

Geometric tolerance: A contour gauge measures the bearing's geometric shape and relative position.

Noise monitoring: A vibration meter monitors vibration during operation to obtain noise data.

Raw material control: Steel and parts are sourced from ISO 14001-certified suppliers, ensuring product stability while promoting sustainable development.

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