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3778-3729D TDO (Two-Row Double-Outer Race) (Imperial)

3778-3729D TDO (Two-Row Double-Outer Race) (Imperial)

The 3778-3729D is a two-row tapered roller bearing with a 1.875″ bore and 3.6718″ outer diameter, built from sturdy chrome steel for lasting performance. It handles combined loads up to 47,800 lbf and is designed for smooth operation in demanding conditions.

Its double-row construction provides extra stability, while the open design allows for easy lubrication. The bearing works well in temperatures from -30°C to 110°C, making it versatile for various environments.

This model is part of the 3700 series, known for reliable performance in heavy-duty applications. Ideal for use in industrial machinery or automotive systems where combined loads are common.

Weighing 4.13 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, ensuring safe and eco-friendly use.

The standard radial clearance and ABEC-1 rating make it a practical choice for general engineering needs. Its tapered roller design ensures even load distribution, reducing wear over time.

Easy to maintain with regular lubrication, this bearing is a dependable option for long-term use. Suitable for applications like gearboxes or conveyor systems where durability is key.

The steel cage adds strength, while the chrome steel rollers enhance smooth rotation. Its dimensions and tolerances ensure a precise fit in most standard setups.

With dynamic radial ratings of 7,120 lbf (one row) and 12,400 lbf (two rows), it offers flexibility for different load requirements. A solid choice for engineers seeking reliability without complexity.

The bearing’s design allows for straightforward installation and replacement. Its compatibility with standard lubrication methods simplifies maintenance routines.

Perfect for scenarios where both radial and thrust loads are present, such as in heavy machinery or agricultural equipment. A no-nonsense solution for everyday industrial challenges.

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Product Parameters

  • Part Number 3778-3729D
  • Brand TFL
  • Size 1.875" x 3.6718" x 1.193"
  • Bore Dia 1.875"
  • 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 2.64"
  • 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 3778
  • 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 4.13 lb

Features

How Is 3778-3729D Bearing Engineered for Reliability?

3778-3729D Bearing features a double-row tapered roller design, providing strong resistance to combined radial and thrust loads.
Its chrome steel rings and rollers ensure durability, even under heavy loads up to 47,800 lbf.
The steel cage maintains proper roller alignment, reducing friction and wear.
With a standard radial clearance, it offers reliable performance in various industrial applications.

What Makes 3778-3729D Bearing Suitable for High-Temperature Applications?

3778-3729D Bearing operates efficiently in temperatures ranging from -30° to 110 °C.
Its chrome steel construction resists thermal expansion, maintaining precision under varying conditions.
The open design allows for easy lubrication, ensuring smooth operation in demanding environments.
This bearing is ideal for applications where temperature fluctuations are common.

Designed for Durability: 3778-3729D Bearing

3778-3729D Bearing is built with high-quality chrome steel for long-lasting performance.
Its double-row design distributes loads evenly, reducing stress on individual components.
The steel cage ensures stability, even at high speeds or under heavy loads.
With a dynamic radial load capacity of 47,800 lbf, it excels in tough industrial settings.

Steel vs Ceramic Bearings: Strengths of 3778-3729D Bearing

3778-3729D Bearing uses chrome steel for its rollers and rings, offering excellent strength and wear resistance.
This material choice makes it more cost-effective than ceramic bearings while maintaining high performance.
The steel cage provides reliable roller guidance, ensuring smooth operation.
Its robust construction makes it suitable for heavy-duty applications where durability is key.

Application

Industrial Uses of 3778-3729D Bearing
The 3778-3729D 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 efficiently.
Its chrome steel construction ensures durability in harsh environments, making it a reliable choice for long-term use.

Where Is 3778-3729D Bearing Used?
You’ll often find the 3778-3729D Bearing in agricultural machinery, like tractors and harvesters, where its tapered roller design provides stability under heavy loads.
The open seal type allows for easy lubrication, which is essential in dusty or high-wear conditions.

Built for Heavy-Duty Use: 3778-3729D Bearing
This bearing excels in industrial gearboxes, where its two-row configuration distributes loads evenly, reducing wear and extending service life.
The inch sizing makes it compatible with a wide range of North American machinery, simplifying replacements.

Automotive vs Aerospace: Applications of 3778-3729D Bearing
In automotive applications, the 3778-3729D Bearing supports drivetrain components, such as differentials, where its combined load capacity is crucial.
While not typically used in aerospace, its precision and durability make it suitable for ground support equipment.

Key Fields for 3778-3729D Bearing
The 3778-3729D Bearing is a go-to choice for railway applications, particularly in axle boxes, where its robust design handles high dynamic loads.
Its standard radial clearance options ensure it can be tailored to specific operational needs.

Q&A

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