387A-384D TDO (Two-Row Double-Outer Race) (Imperial)

The 387A-384D is a two-row tapered roller bearing with a 2.25″ bore and 3.937″ outer diameter, built from sturdy chrome steel for long-lasting performance.
It handles combined loads with a dynamic radial capacity of 42,200 lbf, making it suitable for heavy-duty applications. The open design allows for easy lubrication and maintenance.

Its double-row construction provides stability under high radial and thrust loads, with a dynamic thrust rating of 3,810 lbf per row. The steel cage ensures smooth operation even at varying temperatures from -30°C to 110°C.

This bearing is ideal for industrial machinery, gearboxes, or heavy equipment where robust performance is needed. It meets RoHS and REACH standards, weighing 3.3 lb for easy handling during installation or replacement.

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Description

Features

Application

Q&A

Product Parameters

Part Number 387A-384D
Brand TFL
Size 2.25" x 3.937" x 0.864"
Bore Dia 2.25"
Bore Dia Tolerance +0.005" to 0
Outer Dia 3.937"
Outer Dia Tolerance +0.001" to 0
Double Cup Width 1.6875"
Double Cup Width Tolerance +0.003" to -0.01
Cone Width 0.864"
Cone Width Tolerance +0.002" to -0.01
Bearing Width Across Cups 2.0624"
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 3.68"
Cage Cone Backface Clearance 0.03"
Dynamic Radial Load 42200 lbf
System of Measurement Inch
Type Bearing
Cone Part Number 387A
Cup Part Number 384D
Bearing Type Roller
Roller Bearing Type Tapered
For Load Direction Combined
Construction Double Row
Seal Type Open
Cups Type Standard
Series 385
Ring Material Chrome Steel
Roller Material Chrome Steel
Cage Material Steel
Dynamic Radial Rating(One Row 90 Million Revolutions) 6280 lbf
Dynamic Thrust Rating(90 Million Revolutions) 3810 lbf
Dynamic Radial Rating(Two Row 90 Million Revolutions) 10900 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 3.3 lb

Features

How Is 387A-384D Bearing Engineered for Reliability?

387A-384D 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 42,200 lbf.
The steel cage maintains roller alignment, reducing friction and extending operational life.
With a temperature range of -30° to 110°C, it performs reliably in various conditions.

What Makes 387A-384D Bearing Suitable for High-Temperature Applications?

387A-384D Bearing is built with chrome steel rollers and rings, capable of withstanding temperatures up to 110°C.
Its open design allows for effective lubrication, ensuring smooth operation even under thermal stress.
The double-row construction distributes loads evenly, enhancing performance in demanding environments.
This makes it a dependable choice for industrial applications requiring heat resistance.

Designed for Durability: 387A-384D Bearing

387A-384D Bearing’s tapered roller design and chrome steel components ensure long-lasting performance.
It handles dynamic radial loads up to 42,200 lbf, making it suitable for heavy-duty applications.
The steel cage provides stability, reducing wear and maintenance needs.
Its standard radial clearance options offer flexibility for different operational requirements.

Steel vs Ceramic Bearings: Strengths of 387A-384D Bearing

387A-384D Bearing uses high-quality chrome steel for both rollers and rings, offering excellent strength and wear resistance.
Its dynamic radial load rating of 42,200 lbf highlights its capability in demanding conditions.
The steel cage ensures consistent roller alignment, improving efficiency and longevity.
This makes it a robust alternative to ceramic bearings in many industrial applications.

Application

Industrial Uses of 387A-384D Bearing
The 387A-384D 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.

In automotive applications, 387A-384D Bearing supports axle systems and wheel hubs, providing reliable performance under high stress. The inch sizing makes it a preferred choice for North American vehicle manufacturers.

For industrial conveyor systems, 387A-384D Bearing’s tapered roller design offers smooth operation and long service life. The open seal type allows for easy lubrication, reducing maintenance downtime.

What Makes 387A-384D Bearing a Preferred Choice?
The 387A-384D Bearing excels in agricultural machinery, such as tractors and harvesters, due to its robust construction and ability to withstand harsh conditions. Its standard radial clearance ensures consistent performance.

In material handling equipment, 387A-384D Bearing’s high dynamic load capacity makes it ideal for forklifts and cranes. The steel cage enhances stability, even under heavy loads.

Built for Heavy-Duty Use: 387A-384D Bearing
The 387A-384D Bearing is a reliable option for railway applications, where its tapered rollers manage both radial and axial forces effectively. Its temperature range suits various climatic conditions.

For forestry machinery, 387A-384D Bearing’s durability and ease of maintenance make it a practical choice. The open design allows for quick inspections and lubrication.

Automotive vs Aerospace: Applications of 387A-384D Bearing
In automotive systems, 387A-384D Bearing is often found in drivetrains, offering smooth power transmission. Its inch measurements align with standard automotive specifications.

For aerospace ground support equipment, 387A-384D Bearing provides dependable performance in load-handling devices. Its ABEC-1 rating ensures sufficient precision for these applications.