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Four-Point Contact Angular Contact Ball Bearings (General) QJ 1268 MA/344524

Four-Point Contact Angular Contact Ball Bearings (General) QJ 1268 MA/344524

The QJ 1268 MA/344524 is a four-point contact angular contact ball bearing with a 340mm bore and 620mm outer diameter, crafted from sturdy chrome steel. It manages radial loads up to 238500 lbf and operates smoothly at speeds up to 1600 RPM.

Its single-row design and open construction allow for 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 large machinery where high radial loads are expected.

Weighing 165kg, it’s built for robust performance. Compliant with RoHS and REACH standards for safe and eco-friendly use.

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Product Parameters

  • Part Number QJ 1268 MA/344524
  • 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 340 mm
  • Bore Dia Tolerance -0.03mm to 0
  • Outer Dia 620 mm
  • Outer Dia Tolerance -0.038mm to 0
  • Width 118 mm
  • Width Tolerance -0.05mm to 0
  • External Diameter On Inner Ring (Large Side Face) 447 mm
  • Internal Diameter On Outer Ring 513 mm
  • Chamfer Dimension 6 mm
  • Distance Pressure Point (a) 480 mm
  • Ring Material Chrome Steel
  • Ball Material Chrome Steel
  • Cage Material Brass
  • Dynamic Radial Load 238500 lbf
  • Static Radial Load 551250 lbf
  • Max Speed 1600 rpm
  • Lubrication Lubricated
  • Temperature Range -30° to 110 °C
  • Tolerance Class P6 (ABEC-3)
  • ROHS Compliant
  • REACH Compliant
  • Weight 165 kg
Four-Point Contact Angular Contact Ball Bearings (General) QJ 1268 MA/344524 dimension drawing
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Features

Performance Features of QJ 1268 MA/344524 Bearing

QJ 1268 MA/344524 Bearing is built with chrome steel rings and balls, offering robust resistance to heavy radial loads.

Its dynamic radial load capacity reaches 238500 lbf, making it suitable for demanding industrial applications.

The brass cage ensures smooth ball alignment, reducing friction and enhancing durability.

With a maximum speed of 1,600 rpm, it delivers reliable performance in high-load scenarios.

Application

Industrial Uses of QJ 1268 MA/344524 Bearing
QJ 1268 MA/344524 Bearing is commonly used in heavy machinery, such as large-scale conveyor systems and industrial presses, where its four-point contact design handles combined radial and axial loads efficiently. The brass cage ensures smooth operation even under high stress.

In automotive applications, QJ 1268 MA/344524 Bearing supports large components like truck wheel hubs, providing durability and stability. Its metric sizing makes it a reliable choice for heavy-duty vehicles.

For wind turbines, QJ 1268 MA/344524 Bearing’s chrome steel construction and high load capacity make it ideal for rotor shafts. The open design allows for easy lubrication, extending service life in harsh conditions.

Where Is QJ 1268 MA/344524 Bearing Used?
QJ 1268 MA/344524 Bearing is often found in mining equipment, where its robust design withstands extreme loads and vibrations. The P6 tolerance class ensures precision in demanding environments.

In construction machinery, QJ 1268 MA/344524 Bearing supports crane slewing rings, offering reliable performance under dynamic loads. Its brass cage reduces friction, enhancing operational efficiency.

Built for Heavy-Duty Use: QJ 1268 MA/344524 Bearing
QJ 1268 MA/344524 Bearing excels in steel mills, where its high static radial load capacity handles rolling mill stands. The lubricated design minimises wear in high-temperature conditions.

For marine applications, QJ 1268 MA/344524 Bearing is used in propeller shafts, providing corrosion resistance and long-term reliability. The chrome steel rings ensure durability in saltwater environments.

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