387AS-384DRB TDO (Two-Row Double-Outer Race) (Imperial)

The 387AS-384DRB is a double-row tapered roller bearing with a 2.25″ bore and 4.125″ outer diameter, built from sturdy chrome steel. It handles combined loads up to 42200 lbf and is designed for long-lasting performance in demanding conditions.

Its open design allows for easy lubrication, while the steel cage ensures smooth operation even under heavy radial or thrust loads. The bearing operates well in temperatures ranging from -30°C to 110°C.

This model features a standard radial clearance and meets ABEC-1 precision standards. It’s ideal for industrial machinery, gearboxes, or heavy equipment where reliable load support is needed.

Weighing 3.61 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a dependable choice for replacements or new installations.

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Description

Features

Application

Q&A

Product Parameters

Part Number 387AS-384DRB
Brand TFL
Size 2.25" x 4.125" x 0.864"
Bore Dia 2.25"
Bore Dia Tolerance +0.005" to 0
Outer Dia 4.125"
Outer Dia Tolerance +0.001" to 0
Double Cup Width 1.562"
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 1.9369"
Bearing Width Across Cups Tolerance +0.008" to 0
Cup Backface ToClear Radius 0.03"
Cone Backface Backing Diameter 2.87"
Cup Frontface Backing Diameter 3.74"
Cage Cone Backface Clearance 0.03"
Dynamic Radial Load 42200 lbf
System of Measurement Inch
Type Bearing
Cone Part Number 387AS
Cup Part Number 384DRB
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 3.61 lb

Features

How Is 387AS-384DRB Bearing Engineered for Reliability?

387AS-384DRB 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 service life.
With a standard radial clearance option, it offers flexibility for various applications.

What Makes 387AS-384DRB Bearing Suitable for High-Temperature Applications?

387AS-384DRB Bearing operates reliably in temperatures ranging from -30° to 110 °C.
Its chrome steel rollers and rings maintain performance under thermal stress.
The open design allows for effective lubrication, essential for high-temperature environments.
This ensures consistent operation even in demanding conditions.

Built for Durability: 387AS-384DRB Bearing

387AS-384DRB Bearing is constructed with chrome steel rollers and rings, enhancing its wear resistance.
The double-row design distributes loads evenly, improving longevity.
Its standard radial clearance options provide adaptability for different operational needs.
With a dynamic radial rating of 10,900 lbf for two rows, it handles heavy loads efficiently.

Steel vs Ceramic Bearings: Strengths of 387AS-384DRB Bearing

387AS-384DRB Bearing uses chrome steel for both rollers and rings, offering excellent strength and durability.
This material choice ensures reliable performance under high radial and thrust loads.
The steel cage further enhances stability and reduces wear.
Its robust construction makes it a dependable choice for industrial applications.

Application

Industrial Uses of 387AS-384DRB Bearing
The 387AS-384DRB Bearing is commonly used in heavy machinery, such as construction equipment and mining drills, where its double-row design handles combined radial and thrust loads effectively. Its chrome steel construction ensures durability in tough working conditions.

In automotive applications, 387AS-384DRB Bearing supports wheel hubs and differential systems, providing reliable performance under varying loads. The inch sizing makes it a suitable choice for vehicles manufactured to imperial standards.

For industrial automation, 387AS-384DRB Bearing is often found in conveyor systems and robotic arms, where its open design allows for easy lubrication and maintenance. The standard radial clearance ensures smooth operation in high-speed scenarios.

Where Is 387AS-384DRB Bearing Used?
You’ll often spot 387AS-384DRB Bearing in agricultural machinery, like tractors and harvesters, where its tapered roller design handles heavy loads with ease. The steel cage adds extra strength for long-lasting performance.

In material handling equipment, 387AS-384DRB Bearing ensures smooth operation in forklifts and cranes. Its ABEC-1 rating provides a good balance of precision and affordability for these applications.

Built for Heavy-Duty Use: 387AS-384DRB Bearing
The 387AS-384DRB Bearing is ideal for wind turbine gearboxes, where its double-row construction manages both radial and axial forces. The chrome steel rollers withstand constant stress without compromising performance.

In railway applications, 387AS-384DRB Bearing supports axle boxes, ensuring reliable operation under heavy loads and varying speeds. The standard radial clearance allows for thermal expansion during long journeys.

Automotive vs Aerospace: Applications of 387AS-384DRB Bearing
In automotive systems, 387AS-384DRB Bearing is used in truck transmissions, where its combined load capacity handles shifting forces. The inch measurements make it compatible with many North American vehicle designs.

For aerospace ground equipment, 387AS-384DRB Bearing is found in aircraft tow tractors and loading systems. Its temperature range of -30° to 110°C ensures performance in diverse weather conditions.