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Four-Point Contact Angular Contact Ball Bearings (General) QJ 228 N2MA

Four-Point Contact Angular Contact Ball Bearings (General) QJ 228 N2MA

The QJ 228 N2MA is a four-point contact angular contact ball bearing, measuring 140mm by 250mm by 42mm. Made from chrome steel, it handles radial loads up to 77625 lbf and operates at speeds up to 4300 RPM.

Its single-row design with an open seal ensures easy lubrication, while the brass cage enhances durability. The bearing performs reliably in temperatures ranging from -30°C to 110°C.

This model is interchangeable with SKF bearings, making it a practical choice for replacements. Suitable for heavy-duty applications like industrial gearboxes or machinery where radial loads are prominent.

Weighing 9.85kg, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards for safe and eco-friendly use.

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Product Parameters

  • Part Number QJ 228 N2MA
  • Brand TFL
  • Interchangeable SKF
  • System of Measurement Metric
  • Bearing Type Ball
  • For Load Direction Four Point Contact
  • Construction Single Row
  • Seal Type Open
  • Bore Dia 140 mm
  • Bore Dia Tolerance -0.018mm to 0
  • Outer Dia 250 mm
  • Outer Dia Tolerance -0.02mm to 0
  • Width 42 mm
  • Width Tolerance -0.05mm to 0
  • External Diameter On Inner Ring (Large Side Face) 179 mm
  • Internal Diameter On Outer Ring 211 mm
  • Chamfer Dimension 3 mm
  • Distance Pressure Point (a) 137 mm
  • Ring Material Chrome Steel
  • Ball Material Chrome Steel
  • Cage Material Brass
  • Dynamic Radial Load 77625 lbf
  • Static Radial Load 106875 lbf
  • Max Speed 4300 rpm
  • Lubrication Lubricated
  • Temperature Range -30° to 110 °C
  • Tolerance Class P6 (ABEC-3)
  • ROHS Compliant
  • REACH Compliant
  • Weight 9.85 kg
Four-Point Contact Angular Contact Ball Bearings (General) QJ 228 N2MA dimension drawing
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Features

Performance Features of QJ 228 N2MA Bearing

QJ 228 N2MA Bearing is designed with chrome steel rings and balls, offering robust resistance to radial loads.
Its dynamic radial load capacity reaches 77625 lbf, ensuring reliable performance in demanding applications.
The brass cage maintains ball alignment, reducing friction and extending service life.
With a maximum speed of 4,300 rpm, it balances durability and efficiency.

Application

Industrial Uses of QJ 228 N2MA Bearing
QJ 228 N2MA Bearing is commonly used in heavy machinery like industrial gearboxes and large conveyor systems, where its four-point contact design handles combined radial and axial loads efficiently. The brass cage ensures smooth operation even under high stress.

Where Is QJ 228 N2MA Bearing Used?
In wind turbines, QJ 228 N2MA Bearing supports the main shaft, offering reliable performance in demanding conditions. Its chrome steel construction provides excellent durability for long-term use.

Built for Heavy-Duty Use: QJ 228 N2MA Bearing
This bearing excels in construction equipment, such as cranes and excavators, where its high load capacity and precision tolerance (P6) are essential. The open design allows for easy lubrication and maintenance.

Automotive vs Aerospace: Applications of QJ 228 N2MA Bearing
In automotive applications, QJ 228 N2MA Bearing is found in heavy-duty truck transmissions, while in aerospace, it supports auxiliary systems requiring high precision. Its metric sizing ensures compatibility across industries.

Essential Roles of QJ 228 N2MA Bearing
For robotics and automation, QJ 228 N2MA Bearing provides stable rotation in robotic arms and automated assembly lines. The temperature range (-30° to 110°C) makes it suitable for varied environments.

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