TS (Single Row Tapered Roller Bearings) (Imperial) 3781-3720

The 3781-3720 is a single-row tapered roller bearing with a 1.9375″ bore and 3.6718″ outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 27500 lbf radially and 4120 lbf thrust, making it versatile for various applications.

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

This model is interchangeable with Timken bearings, offering a reliable replacement option. Ideal for industrial machinery, automotive systems, or any setup requiring robust load support.

Weighing 1.900 lb, it’s built to last while maintaining a manageable size. Compliant with RoHS and REACH standards for safe and eco-friendly use.

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Description

Features

Application

Q&A

Product Parameters

Part Number 3781-3720
Brand TFL
Interchangeable Timken
Size 1.9375" x 3.6718" x 1.1875"
Bore Dia 1.9375"
Bore Dia Tolerance +0.005" to 0
Outer Dia 3.6718"
Outer Dia Tolerance +0.001" to 0
Cone Width 1.193"
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 2.2"
Cone Backface Backing Diameter 2.44"
Cup Frontface Backing Diameter 3.50"
Cup Backface Backing Diameter 3.23"
Cage Cone Frontface Clearance 0.06"
Cage Cone Backface Clearance 0.06"
Effective Center Location -0.32"
System of Measurement Inch
Type Bearing
Cone Part Number 3781
Cup Part Number 3720
Bearing Type Roller
Roller Bearing Type Tapered
For Load Direction Combined
Construction Single Row
Seal Type Open
Cups Type Standard
Series 3700
Ring Material Chrome Steel
Roller Material Chrome Steel
Cage Material Steel
Dynamic Radial Load 27500 lbf
Static Radial Load 34300 lbf
Dynamic Radial Rating(90 Million Revolutions)(C90) 7120 lbf
Dynamic Thrust Rating(90 Million Revolutions)(Ca90) 4120 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 1.900 lb

Features

How Does 3781-3720 Bearing Handle Combined Loads?

3781-3720 Bearing is built with chrome steel rings and rollers, offering strong resistance to both radial and thrust loads.
Its dynamic radial load capacity reaches 27,500 lbf, ensuring reliable performance in demanding conditions.
The steel cage maintains proper roller alignment, reducing friction and extending operational life.
With a temperature range of -30° to 110°C, it performs well in various environments.

What Makes 3781-3720 Bearing Suitable for High-Temperature Applications?

3781-3720 Bearing operates effectively in temperatures up to 110°C, maintaining stability under stress.
The chrome steel construction resists wear, ensuring consistent performance in challenging conditions.
Its standard radial clearance options provide flexibility for different application needs.
Lubrication is required to maintain smooth operation and prolong service life.

Engineered for Precision: 3781-3720 Bearing

3781-3720 Bearing features tapered rollers for precise load distribution and reduced friction.
The ABEC-1 rating ensures consistent quality and performance in industrial applications.
With a static radial load capacity of 34,300 lbf, it handles heavy-duty tasks with ease.
Its single-row design simplifies installation while maintaining durability.

Steel vs Ceramic Bearings: Strengths of 3781-3720 Bearing

3781-3720 Bearing uses chrome steel for its rollers and rings, balancing strength and cost-effectiveness.
The steel cage provides reliable support, ensuring smooth operation under combined loads.
Its dynamic thrust rating of 4,120 lbf makes it suitable for varied industrial uses.
The open design allows for easy lubrication and maintenance.

Application

Industrial Uses of 3781-3720 Bearing
The 3781-3720 Bearing is commonly used in heavy machinery like construction equipment and agricultural gear, where its tapered roller design handles combined loads efficiently. Its chrome steel construction ensures durability in tough working conditions.

Where Is 3781-3720 Bearing Used?
You’ll often find the 3781-3720 Bearing in automotive applications, particularly in wheel hubs and differential systems. Its inch sizing makes it a reliable choice for American-made vehicles and industrial machinery.

Built for Heavy-Duty Use: 3781-3720 Bearing
The 3781-3720 Bearing excels in conveyor systems and mining equipment, thanks to its high dynamic radial load capacity. The open design allows for easy lubrication, extending its service life in demanding environments.

Automotive vs Aerospace: Applications of 3781-3720 Bearing
In automotive settings, the 3781-3720 Bearing supports axle assemblies, while in aerospace, it’s used in auxiliary systems. Its ABEC-1 rating ensures consistent performance across different industries.

Essential Roles of 3781-3720 Bearing
The 3781-3720 Bearing is vital in industrial fans and pumps, where its tapered rollers manage both radial and thrust loads. The steel cage adds stability, making it a dependable choice for continuous operation.