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TS (Single Row Tapered Roller Bearings) (Imperial) 3878A-3820

TS (Single Row Tapered Roller Bearings) (Imperial) 3878A-3820

The 3878A-3820 is a single-row tapered roller bearing with a 1.4375″ bore and 3.375″ outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 27900 lbf radially and 4980 lbf in 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 or automotive systems where combined loads are common.

Weighing 1.900 lb, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards for safe and eco-friendly use.

The standard radial clearance ensures easy installation, with options for C3, C4, or C5 available. Its ABEC-1 rating provides dependable precision for most general applications.

Perfect for scenarios requiring a balance of radial and thrust load capacity, such as gearboxes or wheel hubs. The tapered roller design ensures even load distribution for longer service life.

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Product Parameters

  • Part Number 3878A-3820
  • Brand TFL
  • Interchangeable Timken
  • Size 1.4375" x 3.375" x 1.1875"
  • 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 1.1875"
  • Width Tolerance +0.008" to 0
  • Cone Backface ToClear Radius 0.14"
  • Cup Backface ToClear Radius 0.130"
  • Cone Frontface Backing Diameter 1.85"
  • Cone Backface Backing Diameter 2.13"
  • Cup Frontface Backing Diameter 3.23"
  • Cup Backface Backing Diameter 2.87"
  • 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 3820
  • 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-3820 Bearing

3878A-3820 Bearing is built 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 heavy-duty applications.

The steel cage maintains proper roller alignment, reducing friction and extending service life.
With a temperature range of -30° to 110°C, it performs well in various operating conditions.

3878A-3820 Bearing’s tapered roller design distributes loads evenly, enhancing durability.
Its standard radial clearance options provide flexibility for different installation requirements.

Application

Industrial Uses of 3878A-3820 Bearing
3878A-3820 Bearing is commonly used in heavy machinery, such as construction equipment and agricultural gear, where its tapered roller design handles combined loads effectively. The chrome steel construction ensures durability even in demanding environments.

Where Is 3878A-3820 Bearing Used?
You’ll often find 3878A-3820 Bearing in automotive applications like truck wheel hubs, where its ability to manage radial and thrust loads keeps things running smoothly. The imperial sizing makes it a good fit for older or US-made vehicles.

Built for Heavy-Duty Use: 3878A-3820 Bearing
3878A-3820 Bearing works well in industrial fans and pumps, thanks to its robust steel cage and standard radial clearance. Its open design allows for easy lubrication, extending service life in high-use settings.

Automotive vs Aerospace: Applications of 3878A-3820 Bearing
In automotive systems, 3878A-3820 Bearing supports axles and transmissions, while in aerospace, it’s suited for auxiliary equipment due to its reliable load capacity. The ABEC-1 rating balances precision and cost for these applications.

Perfect Fit for Automation: 3878A-3820 Bearing
3878A-3820 Bearing is a solid choice for conveyor systems in automated production lines, where its tapered rollers reduce friction. The steel cage and chrome steel rollers ensure consistent performance over time.

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