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28990-28921D TDO (Two-Row Double-Outer Race) (Imperial)

28990-28921D TDO (Two-Row Double-Outer Race) (Imperial)

The 28990-28921D is a two-row tapered roller bearing with a 2.44″ bore and 3.937″ outer diameter, built from sturdy chrome steel. It handles combined loads up to 41500 lbf and is designed for long-lasting performance.

Its double-row construction provides extra stability, while the open design allows for easy lubrication. The bearing operates smoothly in temperatures ranging from -30°C to 110°C.

This model is part of the 28900 series, with standard radial clearance and an ABEC-1 rating. It’s ideal for heavy-duty applications like truck axles or industrial gearboxes.

Weighing 3.4 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 28990-28921D
  • Brand TFL
  • Size 2.44" x 3.937" x 0.9688"
  • Bore Dia 2.44"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 3.937"
  • Outer Dia Tolerance +0.001" to 0
  • Double Cup Width 1.75"
  • Double Cup Width Tolerance +0.003" to -0.01
  • Cone Width 0.9688"
  • Cone Width Tolerance +0.002" to -0.01
  • Bearing Width Across Cups 2.125"
  • Bearing Width Across Cups Tolerance +0.008" to 0
  • Cup Backface ToClear Radius 0.03"
  • Cone Backface Backing Diameter 2.83"
  • Cup Frontface Backing Diameter 3.82"
  • Cage Cone Backface Clearance 0.02"
  • Dynamic Radial Load 41500 lbf
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 28990
  • Cup Part Number 28921D
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Cups Type Standard
  • Series 28900
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Rating(One Row 90 Million Revolutions) 6180 lbf
  • Dynamic Thrust Rating(90 Million Revolutions) 4500 lbf
  • Dynamic Radial Rating(Two Row 90 Million Revolutions) 10800 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 3.400 lb

Features

Performance Features of 28990-28921D Bearing

28990-28921D Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 41,500 lbf, ensuring reliable performance in heavy-duty applications.

The double-row tapered roller design distributes loads evenly, reducing wear and extending service life.
With a standard radial clearance, it provides smooth operation in various conditions.

28990-28921D Bearing operates efficiently within a temperature range of -30° to 110°C.
Its steel cage maintains roller alignment, enhancing durability and reducing maintenance needs.

The open seal design allows for easy lubrication, ensuring consistent performance.
This bearing is ideal for applications requiring high load capacity and long-term reliability.

Application

Industrial Uses of 28990-28921D Bearing
The 28990-28921D Bearing is well-suited for heavy machinery, such as mining equipment and construction gear, where its double-row design handles combined radial and thrust loads efficiently. Its chrome steel construction ensures durability even in demanding environments.

In automotive applications, 28990-28921D Bearing supports drivetrain components like differentials and wheel hubs, offering reliable performance under high stress. The inch sizing makes it a common choice for North American vehicle models.

For industrial automation, 28990-28921D Bearing’s tapered roller design provides smooth operation in conveyor systems and robotic arms. The open seal type allows for easy lubrication, extending its service life in continuous-use scenarios.

Where Is 28990-28921D Bearing Used?
You’ll often find 28990-28921D Bearing in agricultural machinery, where its robust construction handles the rough conditions of tractors and harvesters. The standard radial clearance ensures consistent performance over time.

In material handling systems, 28990-28921D Bearing’s high dynamic load capacity makes it ideal for forklifts and cranes. The steel cage adds extra strength, preventing deformation under heavy loads.

Built for Heavy-Duty Use: 28990-28921D Bearing
The 28990-28921D Bearing excels in forestry equipment, such as log splitters and sawmills, thanks to its tapered roller design. Its temperature range of -30° to 110°C ensures reliability in varying climates.

For railway applications, 28990-28921D Bearing’s double-row construction provides stability in freight car axles. The ABEC-1 rating balances precision and cost-effectiveness for these high-load scenarios.

Automotive vs Aerospace: Applications of 28990-28921D Bearing
In automotive settings, 28990-28921D Bearing is commonly used in truck transmissions, where its combined load capacity is essential. The inch measurements align with standard US automotive specifications.

For aerospace ground support equipment, 28990-28921D Bearing’s durability makes it suitable for aircraft tugs and loading systems. The chrome steel rollers resist wear even with frequent use.

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