TS (Single Row Tapered Roller Bearings) (Imperial) 3977-3920

The 3977-3920 is a single-row tapered roller bearing with a 2.36″ bore and 4.44″ outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 31,200 lbf radially and 5,570 lbf thrust, making it robust for heavy-duty use.

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

This model is interchangeable with Timken bearings, offering a reliable replacement option. Ideal for applications like truck axles or industrial gearboxes where combined loads are common.

Weighing 2.9 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 3977-3920
Brand TFL
Interchangeable Timken
Size 2.3622" x 4.4375" x 1.1875"
Bore Dia 2.3622"
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 2.68"
Cone Backface Backing Diameter 2.91"
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 3977
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 2.9 lb

Features

Performance Features of 3977-3920 Bearing

3977-3920 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 31,200 lbf, making it suitable for heavy-duty applications.
The steel cage ensures proper roller alignment, reducing friction and extending operational life.
With a temperature range of -30° to 110°C, it performs reliably in various conditions.

How Is 3977-3920 Bearing Engineered for Reliability?

3977-3920 Bearing features precise cone and cup width tolerances, ensuring consistent performance.
The tapered roller design efficiently handles both radial and thrust loads, up to 5,570 lbf.
Its chrome steel construction resists wear, maintaining smooth operation over time.
The standard radial clearance options provide flexibility for different application needs.

Built for Durability: 3977-3920 Bearing

3977-3920 Bearing’s single-row construction simplifies installation while maintaining strength.
The open seal design allows for easy lubrication, enhancing long-term reliability.
With an ABEC-1 rating, it balances precision and cost-effectiveness.
Its effective center location of -0.18″ ensures stable performance under load.

Application

Industrial Uses of 3977-3920 Bearing
You’ll often spot 3977-3920 Bearing in heavy machinery like construction equipment, where its tapered roller design handles combined loads effortlessly. The chrome steel construction ensures it stands up to tough conditions without wearing out quickly.

Where Is 3977-3920 Bearing Used?
In automotive applications, 3977-3920 Bearing works well in wheel hubs and differentials, thanks to its ability to manage both radial and thrust loads. Its inch sizing makes it a go-to for American-made vehicles.

Built for Heavy-Duty Use: 3977-3920 Bearing
This bearing shines in industrial gearboxes, where its open design allows for easy lubrication and maintenance. The steel cage adds durability, making it reliable for long-term use.

Automotive vs Aerospace: Applications of 3977-3920 Bearing
While 3977-3920 Bearing is common in truck axles, it’s also found in smaller aircraft components where precision matters. Its ABEC-1 rating ensures consistent performance across different environments.

Key Fields for 3977-3920 Bearing
Farm equipment like tractors benefits from 3977-3920 Bearing’s robust design, especially in pivot points and drivetrains. The standard radial clearance option makes it versatile for various load conditions.