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TS (Single Row Tapered Roller Bearings) (Imperial) 3978-3920

TS (Single Row Tapered Roller Bearings) (Imperial) 3978-3920

The 3978-3920 is a single-row tapered roller bearing with a 2.3437″ bore and 4.4375″ outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 31200 lbf radially and 5570 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, gearboxes, or automotive systems where combined loads are common.

Weighing 2.9 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it meets safety and environmental requirements.

The 3978-3920 features standard radial clearance and is rated ABEC-1 for precision. Its tapered roller design provides effective load distribution, enhancing performance in demanding conditions.

With a cone width of 1.183″ and cup width of 0.9375″, it fits neatly into compact spaces. The bearing’s effective center location at -0.18″ ensures stable alignment in assemblies.

Suitable for applications requiring frequent lubrication, it maintains reliability over long periods. Commonly used in construction equipment or heavy-duty vehicles.

Its chrome steel rollers and rings offer excellent wear resistance, extending service life even under high stress.

Designed for combined loads, the 3978-3920 excels in both radial and thrust applications. The single-row construction simplifies installation and maintenance.

Its standard cup type and open seal design make it adaptable to various industrial needs. The bearing’s dynamic radial rating of 8090 lbf (C90) ensures long-term performance.

Perfect for machinery with moderate speed requirements, it balances strength and efficiency. Often found in agricultural equipment or conveyor systems.

The bearing’s precise tolerances and robust materials make it a dependable choice for engineers and maintenance teams alike.

The 3978-3920’s tapered rollers reduce friction, improving efficiency in rotating systems. Its chrome steel components resist corrosion and wear, even in harsh environments.

With a static radial load capacity of 43000 lbf, it handles heavy-duty tasks with ease. The bearing’s dimensions and clearances are optimised for smooth operation.

Ideal for replacement in existing systems, it matches Timken’s specifications. Frequently used in mining or material handling equipment.

Compliant with international standards, it offers a cost-effective solution without compromising quality or performance.

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Product Parameters

  • Part Number 3978-3920
  • Brand TFL
  • Interchangeable Timken
  • Size 2.3437" x 4.4375" x 1.1875"
  • Bore Dia 2.3437"
  • 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 0.06"
  • Cup Backface ToClear Radius 0.130"
  • Cone Frontface Backing Diameter 2.68"
  • Cone Backface Backing Diameter 2.76"
  • 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 3978
  • 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 3978-3920 Bearing

3978-3920 Bearing is crafted from chrome steel, offering robust performance under combined loads.
Its dynamic radial load capacity reaches 31,200 lbf, making it suitable for heavy-duty applications.

The tapered roller design ensures efficient load distribution, reducing stress on individual components.
With a standard radial clearance, it provides reliable operation in various industrial settings.

3978-3920 Bearing operates within a temperature range of -30° to 110°C, ensuring versatility.
Its steel cage maintains roller alignment, enhancing durability and reducing maintenance needs.

Application

Key Fields for 3978-3920 Bearing
In industrial settings, 3978-3920 Bearing is commonly used in heavy machinery like gearboxes and conveyor systems, where its tapered roller design handles combined loads effectively. The chrome steel construction ensures durability even in demanding environments.

Where Is 3978-3920 Bearing Used?
You’ll often find 3978-3920 Bearing in automotive applications, particularly in wheel hubs and differentials, where its precise tolerances and load capacity are essential. The inch sizing makes it a good fit for North American vehicle models.

Built for Heavy-Duty Use: 3978-3920 Bearing
For construction equipment, 3978-3920 Bearing provides reliable performance in excavators and cranes, thanks to its robust steel cage and high dynamic load rating. The open design allows for easy lubrication, extending service life.

Automotive vs Aerospace: Applications of 3978-3920 Bearing
In automotive systems, 3978-3920 Bearing supports high radial and thrust loads in transmissions. While in aerospace, its precision and temperature stability make it suitable for auxiliary gearboxes and landing gear mechanisms.

Practical Applications of 3978-3920 Bearing
In agricultural machinery, 3978-3920 Bearing is a go-to for combines and tractors, where its ability to handle shock loads and dirt exposure is valuable. The standard radial clearance option ensures versatility across different operating conditions.

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