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34301-34478D TDO (Two-Row Double-Outer Race) (Imperial)

34301-34478D TDO (Two-Row Double-Outer Race) (Imperial)

The 34301-34478D is a double-row tapered roller bearing with a 3-inch bore and 4.7812-inch outer diameter, built from sturdy chrome steel. It handles combined loads up to 40,000 lbf and is designed for long-lasting performance in demanding conditions.

Its open design allows for easy lubrication, while the steel cage ensures smooth operation. The bearing works well in temperatures from -30°C to 110°C, making it versatile for various environments.

This model features a standard radial clearance and is ABEC-1 rated for reliable precision. Ideal for heavy-duty applications like industrial machinery or vehicle axles where combined loads are common.

Weighing 4.18 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a safe choice for most industrial settings.

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Product Parameters

  • Part Number 34301-34478D
  • Brand TFL
  • Size 3" x 4.7812" x 0.906"
  • Bore Dia 3"
  • 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 3.5"
  • 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 34301
  • 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 4.18 lb

Features

How Is 34301-34478D Bearing Engineered for Reliability?

34301-34478D 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 40,000 lbf.
The steel cage maintains roller alignment, reducing friction and extending service life.
With a standard radial clearance and ABEC-1 rating, it offers reliable performance in various applications.

What Makes 34301-34478D Bearing Suitable for High-Temperature Applications?

34301-34478D Bearing operates effectively within a temperature range of -30° to 110°C, making it suitable for demanding environments.
Its chrome steel rings and rollers resist thermal expansion, ensuring stable performance.
The open design allows for easy lubrication, maintaining smooth operation under high temperatures.
This bearing is ideal for applications where heat resistance is crucial.

Built for Durability: 34301-34478D Bearing

34301-34478D Bearing is constructed with chrome steel rings and rollers, offering excellent wear resistance.
Its double-row design distributes loads evenly, enhancing longevity and reducing maintenance needs.
The steel cage ensures proper roller alignment, minimising friction and noise.
With a weight of 4.18 lb, it balances strength and practicality for heavy-duty use.

Steel vs Ceramic Bearings: Strengths of 34301-34478D Bearing

34301-34478D Bearing uses chrome steel for both rings and rollers, providing a cost-effective and durable solution.
Its dynamic radial rating of 10,400 lbf (two-row) ensures reliable performance under heavy loads.
The steel cage offers robust support, maintaining roller alignment and reducing wear.
This bearing is a practical choice for applications requiring strength and longevity.

Application

Industrial Uses of 34301-34478D Bearing
34301-34478D Bearing is commonly used in heavy machinery, such as construction equipment and mining tools, where its double-row design handles combined loads efficiently. The chrome steel construction ensures durability even in demanding environments.

In automotive applications, 34301-34478D Bearing supports wheel hubs and drivetrains, providing reliable performance under both radial and thrust loads. Its imperial sizing makes it a preferred choice for North American vehicle manufacturers.

For industrial automation, 34301-34478D Bearing is ideal for robotic arms and conveyor systems, where precision and load capacity are key. The open seal design allows for easy lubrication, extending its service life.

What Makes 34301-34478D Bearing a Preferred Choice?
34301-34478D Bearing excels in agricultural machinery, such as tractors and harvesters, thanks to its ability to withstand heavy loads and harsh conditions. The tapered roller design ensures smooth operation even under stress.

In material handling systems, 34301-34478D Bearing is often found in forklifts and cranes, where its combined load capacity is essential. The steel cage adds extra strength, making it suitable for high-impact applications.

Built for Heavy-Duty Use: 34301-34478D Bearing
34301-34478D Bearing is a go-to solution for railway applications, including freight car axles, where reliability and load handling are critical. Its temperature range allows for consistent performance in varying climates.

For power transmission systems, 34301-34478D Bearing supports gearboxes and pulleys, ensuring efficient power transfer. The standard radial clearance offers flexibility for different operational needs.

Automotive vs Aerospace: Applications of 34301-34478D Bearing
In automotive settings, 34301-34478D Bearing is used in differential systems, where its combined load capacity is invaluable. The ABEC-1 rating ensures adequate precision for most vehicle requirements.

For aerospace ground equipment, 34301-34478D Bearing is found in landing gear servicing tools, offering durability and ease of maintenance. The open seal design simplifies inspections and lubrication.

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