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Four-Point Contact Angular Contact Ball Bearings (General) QJ 1248 MA/344524

Four-Point Contact Angular Contact Ball Bearings (General) QJ 1248 MA/344524

The QJ 1248 MA/344524 is a four-point contact angular contact ball bearing with a 240mm bore and 440mm outer diameter, built from sturdy chrome steel. It manages radial loads up to 149175 lbf and operates smoothly at speeds up to 2400 RPM.

Its single-row design and open seal make it easy to maintain, 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, offering a practical replacement option. Suitable for heavy-duty applications like industrial gearboxes or large machinery where radial loads are significant.

Weighing 61kg, it’s a robust choice for demanding environments. Compliant with RoHS and REACH standards for safe and eco-friendly use.

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Product Parameters

  • Part Number QJ 1248 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 240 mm
  • Bore Dia Tolerance -0.022mm to 0
  • Outer Dia 440 mm
  • Outer Dia Tolerance -0.033mm to 0
  • Width 85 mm
  • Width Tolerance -0.05mm to 0
  • External Diameter On Inner Ring (Large Side Face) 316 mm
  • Internal Diameter On Outer Ring 364 mm
  • Chamfer Dimension 4 mm
  • Distance Pressure Point (a) 340 mm
  • Ring Material Chrome Steel
  • Ball Material Chrome Steel
  • Cage Material Brass
  • Dynamic Radial Load 149175 lbf
  • Static Radial Load 274500 lbf
  • Max Speed 2400 rpm
  • Lubrication Lubricated
  • Temperature Range -30° to 110 °C
  • Tolerance Class P6 (ABEC-3)
  • ROHS Compliant
  • REACH Compliant
  • Weight 61 kg
  • Price（$） 3677.41
Four-Point Contact Angular Contact Ball Bearings (General) QJ 1248 MA/344524 dimension drawing
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Features

Performance Features of QJ 1248 MA/344524 Bearing

QJ 1248 MA/344524 Bearing is built with chrome steel rings and balls, offering strong resistance to radial loads.
Its dynamic radial load capacity reaches 149175 lbf, ensuring reliable performance in heavy-duty applications.

The brass cage maintains ball alignment, reducing friction and extending operational life.
With a maximum speed of 2,400 rpm, it balances durability and efficiency.

QJ 1248 MA/344524 Bearing operates smoothly in temperatures ranging from -30° to 110°C.
Its open design allows for easy lubrication, ensuring consistent performance over time.

The P6 tolerance class ensures precision, making it suitable for demanding industrial uses.
Its robust construction and high load capacity make it a dependable choice for various applications.

Application

Industrial Uses of QJ 1248 MA/344524 Bearing
QJ 1248 MA/344524 Bearing is commonly used in heavy machinery, such as large gearboxes and industrial fans, where its four-point contact design handles combined radial and axial loads efficiently. The brass cage ensures smooth operation even under high stress.

In wind turbine applications, QJ 1248 MA/344524 Bearing provides reliable performance due to its robust chrome steel construction and precise P6 tolerance. Its large size and high load capacity make it ideal for supporting rotor shafts.

For construction equipment like cranes, QJ 1248 MA/344524 Bearing’s durability and open design simplify maintenance in harsh environments. The metric dimensions ensure compatibility with a wide range of international machinery standards.

Automotive vs Aerospace: Applications of QJ 1248 MA/344524 Bearing
In automotive systems, QJ 1248 MA/344524 Bearing is suited for heavy-duty transmissions, where its load capacity and precision are key. The lubricated design helps maintain performance over long periods.

Aerospace applications benefit from QJ 1248 MA/344524 Bearing’s ability to handle high speeds and temperatures, making it a fit for auxiliary power units. The brass cage reduces friction, enhancing efficiency in critical systems.

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