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34300-34478D TDO (Two-Row Double-Outer Race) (Imperial)

34300-34478D TDO (Two-Row Double-Outer Race) (Imperial)

The 34300-34478D is a two-row tapered roller bearing with a 3-inch bore and 4.7812-inch outer diameter, built from sturdy chrome steel. It handles combined loads, offering a dynamic radial capacity of 40,000 lbf and smooth operation up to 110°C.

Its double-row design provides extra stability, while the open seal allows for easy lubrication. The steel cage ensures durability, making it suitable for heavy-duty applications.

This bearing is ideal for industrial machinery or vehicle axles where high radial and thrust loads are common. Its standard radial clearance and ABEC-1 rating ensure reliable performance.

Weighing 4.23 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a practical choice for replacements or new installations.

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Product Parameters

  • Part Number 34300-34478D
  • 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 3.39"
  • 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 34300
  • 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 4.23 lb

Features

Structural Advantages of 34300-34478D Bearing

34300-34478D Bearing features a double-row tapered roller design, ideal for handling combined radial and thrust loads.
Its chrome steel construction ensures durability and resistance to wear in demanding applications.

The bearing’s dynamic radial load capacity reaches 40,000 lbf, providing reliable performance under heavy loads.
With standard radial clearance options, it offers flexibility for various operational needs.

34300-34478D Bearing operates efficiently within a temperature range of -30° to 110°C.
Its steel cage maintains roller alignment, enhancing stability and extending service life.

Application

Industrial Uses of 34300-34478D Bearing
The 34300-34478D Bearing is commonly used in heavy machinery like construction equipment and mining drills, where its double-row design handles combined radial and thrust loads efficiently.
Its chrome steel construction ensures durability in harsh environments, making it a reliable choice for long-term industrial applications.

Where Is 34300-34478D Bearing Used?
You’ll often find the 34300-34478D Bearing in automotive applications, particularly in wheel hubs and differential systems, where its tapered roller design provides smooth performance.
The inch sizing makes it compatible with many North American vehicle models, offering versatility across different makes and models.

Built for Heavy-Duty Use: 34300-34478D Bearing
In agricultural machinery, the 34300-34478D Bearing supports high-load applications like tractor transmissions, thanks to its robust steel cage and chrome steel rollers.
The open seal design allows for easy lubrication, ensuring consistent performance even in dusty or demanding conditions.

Automotive vs Aerospace: Applications of 34300-34478D Bearing
In automotive systems, the 34300-34478D Bearing excels in axle assemblies, where its combined load capacity is essential.
For aerospace ground equipment, its precision and durability make it suitable for handling heavy loads in aircraft maintenance tools.

Key Fields for 34300-34478D Bearing
The 34300-34478D Bearing is ideal for conveyor systems in manufacturing plants, where its double-row design reduces friction and wear.
Its standard radial clearance options provide flexibility for different operational needs, ensuring smooth performance across various speeds.

Q&A

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