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3781-3729D TDO (Two-Row Double-Outer Race) (Imperial)

3781-3729D TDO (Two-Row Double-Outer Race) (Imperial)

The 3781-3729D is a double-row tapered roller bearing with a 1.9375″ bore and 3.6718″ outer diameter, built from sturdy chrome steel for combined load handling. It supports dynamic radial loads up to 47800 lbf and fits snugly with precise imperial tolerances.

Its open design allows easy lubrication, while the steel cage ensures durability under heavy use. The bearing operates smoothly in temperatures from -30°C to 110°C, making it versatile for various conditions.

This model is part of the 3700 series, featuring standard cups and ABEC-1 precision. Ideal for industrial gearboxes or heavy machinery where combined radial and thrust loads are common.

Weighing 4.08 lb, it balances strength with manageable size. Compliant with RoHS and REACH standards for safe industrial applications.

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Product Parameters

  • Part Number 3781-3729D
  • Brand TFL
  • Size 1.9375" x 3.6718" x 1.193"
  • Bore Dia 1.9375"
  • 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 2.44"
  • 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 3781
  • 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 4.08 lb

Features

How Is 3781-3729D Bearing Engineered for Reliability?

3781-3729D 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 47,800 lbf.

The precision tolerances on bore and outer diameters enhance alignment, reducing wear during operation.
With a temperature range of -30° to 110°C, it performs reliably in various conditions.

The steel cage maintains roller alignment, extending the bearing’s service life.
Lubrication is required, but the open design simplifies maintenance.

Application

Industrial Uses of 3781-3729D Bearing
The 3781-3729D Bearing is commonly used in heavy machinery like construction equipment, where its double-row design handles combined radial and thrust loads efficiently. Its chrome steel construction ensures durability in demanding environments.

In automotive applications, 3781-3729D Bearing supports wheel hubs and differential systems, providing reliable performance under varying loads. The imperial sizing makes it a preferred choice for North American vehicle models.

For industrial automation, 3781-3729D Bearing excels in conveyor systems and robotic arms, where precision and load capacity are key. The open design allows for easy lubrication, extending its service life.

Where Is 3781-3729D Bearing Used?
You’ll often find 3781-3729D Bearing in agricultural machinery, where its tapered roller design handles uneven loads smoothly. The steel cage adds extra strength for long-term use.

In mining equipment, 3781-3729D Bearing’s robust construction withstands harsh conditions, reducing downtime. Its standard radial clearance ensures consistent performance even under heavy stress.

Built for Heavy-Duty Use: 3781-3729D Bearing
The 3781-3729D Bearing is ideal for forestry equipment, where its combined load capacity and durability are essential. The chrome steel rollers provide excellent wear resistance.

In material handling systems, 3781-3729D Bearing’s double-row design offers stability and reliability. Its ABEC-1 rating ensures sufficient precision for most industrial applications.

Automotive vs Aerospace: Applications of 3781-3729D Bearing
In automotive systems, 3781-3729D Bearing is often used in drivetrains, where its load-handling capabilities shine. The imperial measurements make it easy to integrate into existing designs.

For aerospace ground support equipment, 3781-3729D Bearing provides reliable performance without the need for high-precision tolerances. Its temperature range suits most operational conditions.

Q&A

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