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TS (Single Row Tapered Roller Bearings) (Imperial) 3878A-3821

TS (Single Row Tapered Roller Bearings) (Imperial) 3878A-3821

The 3878A-3821 is a single-row tapered roller bearing with a 1.4375″ bore and 3.375″ outer diameter, crafted from sturdy chrome steel. It manages combined loads up to 27900 lbf radially and 4980 lbf in thrust, suitable for demanding applications.

Its open design allows for easy lubrication, while the steel cage ensures durability. The bearing operates smoothly in temperatures ranging 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-duty machinery or automotive systems where combined loads are common.

Weighing 1.900 lb, it balances strength and manageability. Compliant with RoHS and REACH standards, it meets safety and environmental requirements.

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Product Parameters

  • Part Number 3878A-3821
  • Brand TFL
  • Interchangeable Timken
  • Size 1.4375" x 3.375" x 1.1876"
  • Bore Dia 1.4375"
  • Bore Dia Tolerance +0.005" to 0
  • Outer Dia 3.375"
  • Outer Dia Tolerance +0.001" to 0
  • Cone Width 1.1875"
  • Cone Width Tolerance +0.003" to -0.01
  • Cup Width 0.9375"
  • Cup Width Tolerance +0.002" to -0.01
  • Width 1.1876"
  • Width Tolerance +0.008" to 0
  • Cone Backface ToClear Radius 0.14"
  • Cup Backface ToClear Radius 0.050"
  • Cone Frontface Backing Diameter 1.85"
  • Cone Backface Backing Diameter 2.13"
  • Cup Frontface Backing Diameter 3.23"
  • Cup Backface Backing Diameter 2.95"
  • Cage Cone Frontface Clearance 0.11"
  • Cage Cone Backface Clearance 0.04"
  • Effective Center Location -0.32"
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 3878A
  • Cup Part Number 3821
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Single Row
  • Seal Type Open
  • Cups Type Standard
  • Series 3800
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Load 27900 lbf
  • Static Radial Load 33200 lbf
  • Dynamic Radial Rating(90 Million Revolutions)(C90) 7240 lbf
  • Dynamic Thrust Rating(90 Million Revolutions)(Ca90) 4980 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

Performance Features of 3878A-3821 Bearing

3878A-3821 Bearing is crafted with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 27,900 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 3878A-3821 Bearing Engineered for Reliability?

3878A-3821 Bearing features a single-row tapered roller design, optimised for combined load applications.
The chrome steel construction enhances durability, while the standard radial clearance ensures smooth operation.
Its dynamic thrust rating of 4,980 lbf at 90 million revolutions highlights its long-lasting performance.
The open design allows for easy lubrication, maintaining efficiency over time.

Built for Durability: 3878A-3821 Bearing

3878A-3821 Bearing’s tapered roller design provides excellent load distribution, reducing wear.
The chrome steel components resist wear and corrosion, ensuring a longer service life.
With a static radial load capacity of 33,200 lbf, it handles heavy-duty applications with ease.
Its ABEC-1 rating ensures consistent performance in precision tasks.

Application

Industrial Uses of 3878A-3821 Bearing
3878A-3821 Bearing is commonly used in heavy machinery like construction equipment and agricultural gear, where its tapered roller design handles combined loads efficiently.
The chrome steel construction ensures durability even in tough conditions, making it a reliable choice for long-term use.

Where Is 3878A-3821 Bearing Used?
You’ll often find 3878A-3821 Bearing in automotive applications, particularly in wheel hubs and differential systems.
Its inch sizing makes it compatible with many North American vehicles, and the open design simplifies lubrication.

Built for Heavy-Duty Use: 3878A-3821 Bearing
3878A-3821 Bearing excels in industrial settings like conveyor systems, where its high dynamic load capacity keeps things running smoothly.
The steel cage adds extra strength, making it suitable for high-stress environments.

Automotive vs Aerospace: Applications of 3878A-3821 Bearing
In automotive systems, 3878A-3821 Bearing supports wheel assemblies, while in aerospace, it’s used in auxiliary gearboxes.
The tapered rollers provide stability under varying loads, ensuring consistent performance in both fields.

Key Fields for 3878A-3821 Bearing
3878A-3821 Bearing is a go-to for mining equipment, where its robust design handles heavy radial and thrust loads.
The standard radial clearance option makes it versatile for different operational needs.

Q&A

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