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34274-34478D TDO (Two-Row Double-Outer Race) (Imperial)

34274-34478D TDO (Two-Row Double-Outer Race) (Imperial)

The 34274-34478D is a two-row tapered roller bearing with a 2.754″ bore and 4.7812″ outer diameter, built from sturdy chrome steel. It handles combined loads up to 10400 lbf radially and 4600 lbf in thrust, making it a robust choice for heavy-duty applications.

Its open design allows for easy lubrication, while the steel cage ensures durability under high stress. The bearing operates smoothly in temperatures ranging from -30°C to 110°C, suitable for various industrial environments.

This model features a standard radial clearance and is ABEC-1 rated, offering reliable performance without excessive precision demands. Ideal for use in gearboxes, axles, or machinery where combined loads are common.

Weighing 4.79 lb, it’s a solid option for replacements or upgrades. Compliant with RoHS and REACH standards, it’s safe for most industrial uses.

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Product Parameters

  • Part Number 34274-34478D
  • Brand TFL
  • Size 2.754" x 4.7812" x 0.906"
  • Bore Dia 2.754"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 4.7812"
  • Outer Dia Tolerance +0.001" to 0
  • Double Cup Width 1.5"
  • Double Cup Width Tolerance +0.003" to -0.01
  • Cone Width 0.906"
  • Cone Width Tolerance +0.002" to -0.01
  • Bearing Width Across Cups 2.0625"
  • Bearing Width Across Cups Tolerance +0.008" to 0
  • Cup Backface ToClear Radius 0.03"
  • Cone Backface Backing Diameter 3.19"
  • Cup Frontface Backing Diameter 4.60"
  • Cage Cone Backface Clearance 0.09"
  • Dynamic Radial Load 40000 lbf
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 34274
  • Cup Part Number 34478D
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Cups Type Standard
  • Series 34000
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Rating(One Row 90 Million Revolutions) 5960 lbf
  • Dynamic Thrust Rating(90 Million Revolutions) 4600 lbf
  • Dynamic Radial Rating(Two Row 90 Million Revolutions) 10400 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 4.79 lb

Features

How Is 34274-34478D Bearing Engineered for Reliability?

34274-34478D Bearing features a double-row tapered roller design, providing strong resistance to combined radial and thrust loads.
Its chrome steel construction ensures durability, even under heavy dynamic radial loads of up to 40,000 lbf.
The steel cage maintains proper roller alignment, reducing wear and enhancing performance.
With a standard radial clearance option, it offers flexibility for various applications.

What Makes 34274-34478D Bearing Suitable for High-Temperature Applications?

34274-34478D Bearing operates effectively in temperatures ranging from -30° to 110°C, making it suitable for demanding environments.
Its chrome steel rollers and rings resist thermal expansion, ensuring stable performance.
The open design allows for easy lubrication, maintaining smooth operation under heat.
This bearing is ideal for industrial applications where temperature fluctuations are common.

Designed for Durability: 34274-34478D Bearing

34274-34478D Bearing is built with high-quality chrome steel, offering excellent wear resistance.
Its double-row construction distributes loads evenly, extending service life.
The precision-engineered cage ensures consistent roller movement, reducing friction.
With a dynamic radial rating of 10,400 lbf for two rows, it handles heavy loads reliably.

Steel vs Ceramic Bearings: Strengths of 34274-34478D Bearing

34274-34478D Bearing uses chrome steel for both rollers and rings, providing a balance of strength and affordability.
This material choice ensures robust performance under high dynamic radial loads.
The steel cage further enhances durability and alignment precision.
While ceramic options exist, this bearing’s steel construction makes it a practical choice for many industrial uses.

Application

Industrial Uses of 34274-34478D Bearing
34274-34478D Bearing is commonly used in heavy machinery, such as construction equipment and mining vehicles, where its double-row design handles combined radial and thrust loads effectively. The chrome steel construction ensures durability in tough working conditions.

In automotive applications, 34274-34478D Bearing supports wheel hubs and differential systems, providing reliable performance under varying loads. Its imperial sizing makes it a preferred choice for American and British vehicle manufacturers.

For industrial conveyor systems, 34274-34478D Bearing’s open design allows for easy lubrication, extending service life in high-load environments. The tapered roller design also helps maintain alignment under heavy use.

What Makes 34274-34478D Bearing a Preferred Choice?
34274-34478D Bearing is ideal for agricultural machinery, such as tractors and harvesters, where its robust construction withstands dust and debris. The steel cage adds extra strength for long-term use.

In railway applications, 34274-34478D Bearing ensures smooth operation in axle boxes, thanks to its ability to handle both radial and thrust loads. The standard radial clearance option makes it versatile for various rail conditions.

Built for Heavy-Duty Use: 34274-34478D Bearing
34274-34478D Bearing excels in marine equipment, like winches and cranes, where its corrosion-resistant materials perform well in salty environments. The double-row design also distributes loads evenly.

For power transmission systems, 34274-34478D Bearing’s tapered rollers reduce friction, improving efficiency in gearboxes and driveshafts. Its ABEC-1 rating ensures consistent performance in industrial settings.

Q&A

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