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3784-3729D TDO (Two-Row Double-Outer Race) (Imperial)

3784-3729D TDO (Two-Row Double-Outer Race) (Imperial)

The 3784-3729D is a double-row tapered roller bearing with a 2-inch bore and 3.6718-inch outer diameter, built from sturdy chrome steel. It handles combined loads up to 47,800 lbf and is designed for long-lasting performance.

Its open design allows 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 conditions.

This model is part of the 3700 series, offering standard radial clearance with options for C3, C4, or C5. Ideal for heavy-duty applications like industrial gearboxes or vehicle axles.

Weighing 3.87 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards for safe use.

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Product Parameters

  • Part Number 3784-3729D
  • Brand TFL
  • Size 2" x 3.6718" x 1.193"
  • Bore Dia 2"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 3.6718"
  • Outer Dia Tolerance +0.001" to 0
  • Double Cup Width 2.0625"
  • Double Cup Width Tolerance +0.003" to -0.01
  • Cone Width 1.193"
  • Cone Width Tolerance +0.002" to -0.01
  • Bearing Width Across Cups 2.5625"
  • 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 3.50"
  • Cage Cone Backface Clearance 0.06"
  • Dynamic Radial Load 47800 lbf
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 3784
  • Cup Part Number 3729D
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Cups Type Standard
  • Series 3700
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Rating(One Row 90 Million Revolutions) 7120 lbf
  • Dynamic Thrust Rating(90 Million Revolutions) 4120 lbf
  • Dynamic Radial Rating(Two Row 90 Million Revolutions) 12400 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 3.87 lb

Features

How Is 3784-3729D Bearing Engineered for Reliability?

3784-3729D Bearing features a double-row tapered roller design, providing robust support for combined radial and thrust loads.
Its chrome steel construction ensures durability and resistance to wear in demanding conditions.
With a dynamic radial load capacity of 47,800 lbf, it handles heavy-duty applications with ease.
The open design allows for easy lubrication, maintaining smooth operation over time.

What Makes 3784-3729D Bearing Suitable for High-Temperature Applications?

3784-3729D Bearing operates reliably in temperatures ranging from -30° to 110°C.
Its chrome steel rollers and rings maintain structural integrity under thermal stress.
The standard radial clearance options, including C3/C4/C5, accommodate varying thermal expansions.
This ensures consistent performance even in fluctuating temperature environments.

Built for Durability: 3784-3729D Bearing

3784-3729D Bearing’s double-row construction distributes loads evenly, reducing stress on individual rollers.
The steel cage keeps rollers aligned, minimising wear and extending service life.
Its high dynamic radial rating of 12,400 lbf for two rows ensures long-term reliability.
This makes it a dependable choice for industrial and heavy machinery applications.

Steel vs Ceramic Bearings: Strengths of 3784-3729D Bearing

3784-3729D Bearing uses chrome steel for both rollers and rings, offering excellent strength and fatigue resistance.
The material choice ensures cost-effective performance without compromising on durability.
Its standard ABEC-1 rating provides reliable precision for most industrial uses.
The steel cage further enhances stability, making it suitable for high-load scenarios.

Application

Industrial Uses of 3784-3729D Bearing
The 3784-3729D 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 efficiently. Its chrome steel construction ensures durability in demanding environments.

Where Is 3784-3729D Bearing Used?
You’ll often find the 3784-3729D Bearing in automotive applications like truck wheel hubs, where its tapered roller design provides smooth performance under heavy loads. The inch sizing makes it a reliable choice for North American vehicle models.

Built for Heavy-Duty Use: 3784-3729D Bearing
This bearing excels in industrial gearboxes, thanks to its robust steel cage and high dynamic load capacity. The open seal design allows for easy lubrication, extending its service life in high-stress conditions.

Automotive vs Aerospace: Applications of 3784-3729D Bearing
In automotive systems, the 3784-3729D Bearing supports wheel hubs and transmissions, while in aerospace, it’s suited for auxiliary equipment due to its precision and reliability. The standard radial clearance ensures consistent performance across applications.

Practical Applications of 3784-3729D Bearing
For conveyor systems and agricultural machinery, the 3784-3729D Bearing offers reliable performance with its combined load handling. The chrome steel rollers reduce wear, making it a cost-effective choice for long-term use.

Q&A

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