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39578-39520DC TDO (Two-Row Double-Outer Race) (Imperial)

39578-39520DC TDO (Two-Row Double-Outer Race) (Imperial)

The 39578-39520DC is a double-row tapered roller bearing with a 2.125″ bore and 4.4375″ outer diameter, built from sturdy chrome steel. It handles combined loads up to 65300 lbf and works well in temperatures from -30°C to 110°C.

Its open design allows easy lubrication, while the steel cage ensures durability. The bearing comes in standard radial clearance but can also be ordered in C3, C4, or C5 for specific needs.

This model is part of the 39500 series, with a two-row design that boosts load capacity. Ideal for heavy-duty applications like truck axles or industrial gearboxes where combined loads are common.

Weighing 6.72 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a reliable choice for replacements or new installations.

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Product Parameters

  • Part Number 39578-39520DC
  • Brand TFL
  • Size 2.125" x 4.4375" x 1.1875"
  • Bore Dia 2.125"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 4.4375"
  • Outer Dia Tolerance +0.001" to 0
  • Double Cup Width 2.1875"
  • Double Cup Width Tolerance +0.003" to -0.01
  • Cone Width 1.1875"
  • Cone Width Tolerance +0.002" to -0.01
  • Bearing Width Across Cups 2.6875"
  • Bearing Width Across Cups Tolerance +0.008" to 0
  • Cup Backface ToClear Radius 0.03"
  • Cone Backface Backing Diameter 2.76"
  • Cup Frontface Backing Diameter 4.25"
  • Cage Cone Backface Clearance 0.05"
  • Dynamic Radial Load 65300 lbf
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 39578
  • Cup Part Number 39520DC
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Cups Type Standard
  • Series 39500
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Rating(One Row 90 Million Revolutions) 9730 lbf
  • Dynamic Thrust Rating(90 Million Revolutions) 5650 lbf
  • Dynamic Radial Rating(Two Row 90 Million Revolutions) 16900 lbf
  • Lubrication Required
  • Temperature Range -30° to 110 °C
  • ABEC Rating ABEC-1
  • Radial Clearance Standard (Available in C3/C4/C5)
  • RoHS Compliant
  • REACH Compliant
  • Weight 6.72 lb

Features

How Is 39578-39520DC Bearing Engineered for Reliability?

39578-39520DC Bearing features a double-row tapered roller design, providing strong resistance to combined radial and thrust loads.
Its chrome steel construction ensures durability, with a dynamic radial load capacity of 65,300 lbf.

The steel cage maintains roller alignment, reducing friction and extending the bearing’s service life.
With a temperature range of -30° to 110°C, it performs reliably in various operating conditions.

39578-39520DC Bearing’s standard radial clearance and ABEC-1 rating offer consistent precision.
Its open design simplifies lubrication, ensuring smooth operation over time.

Application

Industrial Uses of 39578-39520DC Bearing
The 39578-39520DC Bearing is commonly used in heavy machinery, such as construction equipment and mining tools, where its double-row design handles combined radial and thrust loads effectively.
Its chrome steel construction ensures durability in harsh environments, making it a reliable choice for industrial applications.

What Makes 39578-39520DC Bearing a Preferred Choice?
In automotive applications, 39578-39520DC Bearing is often found in wheel hubs and differential systems, providing smooth performance under heavy loads.
The inch sizing makes it compatible with many American-made vehicles, offering versatility across different models.

Built for Heavy-Duty Use: 39578-39520DC Bearing
For agricultural machinery, 39578-39520DC Bearing supports high-load components like tractor axles, ensuring long-lasting performance.
The open seal design allows for easy lubrication, which is essential in dusty or dirty working conditions.

Automotive vs Aerospace: Applications of 39578-39520DC Bearing
In automotive systems, 39578-39520DC Bearing excels in transmissions and drivetrains, where its tapered rollers manage high stress.
While less common in aerospace, it can be found in ground support equipment, benefiting from its robust construction.

Key Fields for 39578-39520DC Bearing
The 39578-39520DC Bearing is ideal for industrial fans and pumps, where its double-row design provides stability under varying loads.
Its standard radial clearance options make it adaptable to different operational requirements.

Q&A

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