TS (Single Row Tapered Roller Bearings) (Imperial) 3979-3919RB

The 3979-3919RB is a single-row tapered roller bearing with a 2.25″ bore and 4.4375″ outer diameter, crafted from durable chrome steel. It handles combined loads up to 31200 lbf radially and 5570 lbf thrust, suitable for heavy-duty applications.

Its open design allows easy lubrication, while the steel cage ensures reliable performance. The bearing operates smoothly in temperatures ranging from -30°C to 110°C.

This model is interchangeable with Timken bearings, making it a practical choice for replacements. Ideal for use in gearboxes, axles, or industrial machinery where combined loads are common.

Weighing 3 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it meets industry requirements for safe use.

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Description

Features

Application

Q&A

Product Parameters

Part Number 3979-3919RB
Brand TFL
Interchangeable Timken
Size 2.25" x 4.4375" x 1.1875"
Bore Dia 2.25"
Bore Dia Tolerance +0.005" to 0
Outer Dia 4.4375"
Outer Dia Tolerance +0.001" to 0
Cone Width 1.183"
Cone Width Tolerance +0.003" to -0.01
Cup Width 0.9687"
Cup Width Tolerance +0.002" to -0.01
Width 1.1875"
Width Tolerance +0.008" to 0
Cone Backface ToClear Radius 0.14"
Cup Backface ToClear Radius 0.130"
Cone Frontface Backing Diameter 2.6"
Cone Backface Backing Diameter 2.83"
Cup Frontface Backing Diameter 4.18"
Cup Backface Backing Diameter 3.90"
Cage Cone Frontface Clearance 0.08"
Cage Cone Backface Clearance 0.06"
Effective Center Location -0.18"
System of Measurement Inch
Type Bearing
Cone Part Number 3979
Cup Part Number 3919RB
Bearing Type Roller
Roller Bearing Type Tapered
For Load Direction Combined
Construction Single Row
Seal Type Open
Cups Type Standard
Series 3900
Ring Material Chrome Steel
Roller Material Chrome Steel
Cage Material Steel
Dynamic Radial Load 31200 lbf
Static Radial Load 43000 lbf
Dynamic Radial Rating(90 Million Revolutions)(C90) 8090 lbf
Dynamic Thrust Rating(90 Million Revolutions)(Ca90) 5570 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 lb

Features

Performance Features of 3979-3919RB Bearing

3979-3919RB Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 31,200 lbf, ensuring reliable performance in demanding conditions.

The tapered roller design of 3979-3919RB Bearing provides smooth operation and even load distribution.
With a standard radial clearance, it balances precision and durability for various applications.

3979-3919RB Bearing operates efficiently within a temperature range of -30° to 110°C.
The steel cage maintains roller alignment, reducing wear and extending service life.

Designed for easy lubrication, 3979-3919RB Bearing simplifies maintenance routines.
Its open construction allows for straightforward installation and inspection.

Application

Industrial Uses of 3979-3919RB Bearing
The 3979-3919RB Bearing is commonly used in heavy machinery like construction equipment and mining gear, where its tapered roller design handles combined loads efficiently. Its chrome steel construction ensures durability even in demanding environments.

Where Is 3979-3919RB Bearing Used?
You’ll often find 3979-3919RB Bearing in automotive applications, particularly in wheel hubs and differential systems. Its imperial sizing makes it a straightforward fit for many North American vehicle models.

Built for Heavy-Duty Use: 3979-3919RB Bearing
In industrial settings, 3979-3919RB Bearing supports conveyor systems and gearboxes, thanks to its robust design and high load capacity. The open seal type allows for easy lubrication, extending its service life.

Automotive vs Aerospace: Applications of 3979-3919RB Bearing
While 3979-3919RB Bearing excels in automotive wheel assemblies, it’s also suitable for aerospace ground support equipment. Its ABEC-1 rating ensures reliable performance without over-engineering for less critical applications.

Perfect Fit for Automation: 3979-3919RB Bearing
In automated production lines, 3979-3919RB Bearing provides smooth operation for robotic arms and assembly machines. The steel cage adds stability, reducing maintenance needs in high-cycle environments.