TS (Single Row Tapered Roller Bearings) (Imperial) 3981-3920

The 3981-3920 is a single-row tapered roller bearing with a 2.3125″ bore and 4.4375″ outer diameter, crafted from sturdy chrome steel. It manages combined loads up to 31200 lbf radially and 5570 lbf thrust, suitable for demanding applications.

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

This model is interchangeable with Timken bearings, offering a reliable replacement option. Ideal for heavy machinery or automotive systems where combined loads are common.

Weighing 3 lb, it balances strength and manageability. Compliant with RoHS and REACH standards, it meets safety and environmental requirements.

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Description

Features

Application

Q&A

Product Parameters

Part Number 3981-3920
Brand TFL
Interchangeable Timken
Size 2.3125" x 4.4375" x 1.1875"
Bore Dia 2.3125"
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 0.9375"
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 2.64"
Cone Backface Backing Diameter 2.87"
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 3981
Cup Part Number 3920
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 3981-3920 Bearing

3981-3920 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 steel cage maintains roller alignment, reducing friction and extending operational life.
With a temperature range of -30° to 110°C, it performs well in various environments.

How Is 3981-3920 Bearing Engineered for Reliability?

3981-3920 Bearing features a single-row tapered roller design, ideal for handling both radial and thrust loads.
The chrome steel construction enhances durability, while the standard radial clearance ensures smooth operation.
Its effective center location of -0.18″ provides stability under heavy loads.
This bearing is interchangeable with Timken models, offering flexibility in replacements.

Designed for Durability: 3981-3920 Bearing

3981-3920 Bearing’s chrome steel rollers and rings provide excellent wear resistance, even under high stress.
The open design allows for easy lubrication, maintaining performance over time.
With a static radial load capacity of 43,000 lbf, it suits heavy-duty applications.
Its ABEC-1 rating ensures consistent precision in various industrial uses.

Steel vs Ceramic Bearings: Strengths of 3981-3920 Bearing

3981-3920 Bearing uses chrome steel for both rollers and rings, balancing cost and performance.
This material choice ensures high load capacity and resistance to wear in tough conditions.
The steel cage further enhances durability, keeping rollers aligned during operation.
Its standard radial clearance makes it versatile for different installation requirements.

Application

Industrial Uses of 3981-3920 Bearing
In heavy machinery like construction equipment, 3981-3920 Bearing handles combined loads with ease, thanks to its tapered roller design. The chrome steel construction ensures durability even in tough conditions.

Where Is 3981-3920 Bearing Used?
You’ll often find 3981-3920 Bearing in agricultural gearboxes, where its robust build supports high radial and thrust loads. The inch sizing makes it a fit for many North American machines.

Built for Heavy-Duty Use: 3981-3920 Bearing
3981-3920 Bearing excels in mining conveyors, where its open design allows for easy lubrication. The steel cage adds stability during prolonged operation.

Automotive vs Aerospace: Applications of 3981-3920 Bearing
In trucks, 3981-3920 Bearing supports axles and wheels, while in smaller aircraft components, its precision ensures smooth performance. The ABEC-1 rating balances cost and reliability.

Perfect Fit for Automation: 3981-3920 Bearing
For automated assembly lines, 3981-3920 Bearing’s consistent performance reduces downtime. Its standard radial clearance suits a variety of industrial settings.