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TS (Single Row Tapered Roller Bearings) (Imperial) 8578-8522

TS (Single Row Tapered Roller Bearings) (Imperial) 8578-8522

The 8578-8522 is a single-row tapered roller bearing with a 9.5″ bore and 12.938″ outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 119,000 lbf radially and 21,400 lbf thrust, making it suitable for heavy-duty applications.

Its open design allows for easy lubrication, while the steel cage ensures durability under high stress. 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 heavy equipment where robust performance is needed.

Weighing 25.40 lb, it’s built to last while meeting RoHS and REACH standards for safety and compliance. The standard radial clearance ensures straightforward installation and maintenance.

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Product Parameters

  • Part Number 8578-8522
  • Brand TFL
  • Interchangeable Timken
  • Size 9.5" x 12.938" x 2.0625"
  • Bore Dia 9.5"
  • Bore Dia Tolerance +0.001" to 0
  • Outer Dia 12.938"
  • Outer Dia Tolerance +0.002" to 0
  • Cone Width 2.0625"
  • Cone Width Tolerance +0.003" to -0.01
  • Cup Width 1.4375"
  • Cup Width Tolerance +0.002" to -0.01
  • Width 2.0625"
  • Width Tolerance +0.014" to -0.01"
  • Cone Backface ToClear Radius 0.25"
  • Cup Backface ToClear Radius 0.130"
  • Cone Frontface Backing Diameter 11.14"
  • Cone Backface Backing Diameter 10.39"
  • Cup Frontface Backing Diameter 12.40"
  • Cup Backface Backing Diameter 12.05"
  • Cage Cone Frontface Clearance 0.13"
  • Cage Cone Backface Clearance 0.24"
  • Effective Center Location 0.3"
  • System of Measurement Inch
  • Type Bearing
  • Cone Part Number 8578
  • Cup Part Number 8522
  • Bearing Type Roller
  • Roller Bearing Type Tapered
  • For Load Direction Combined
  • Construction Single Row
  • Seal Type Open
  • Cups Type Standard
  • Series 8500
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Steel
  • Dynamic Radial Load 119000 lbf
  • Static Radial Load 240000 lbf
  • Dynamic Radial Rating(90 Million Revolutions)(C90) 30700 lbf
  • Dynamic Thrust Rating(90 Million Revolutions)(Ca90) 21400 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 25.40 lb

Features

How Does 8578-8522 Bearing Handle Combined Loads?

8578-8522 Bearing is built with chrome steel rings and rollers, offering strong resistance to both radial and thrust loads.
Its dynamic radial load capacity reaches 119,000 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.

Why Choose 8578-8522 Bearing for Heavy-Duty Applications?

8578-8522 Bearing features a single-row tapered roller design, optimised for combined load handling.
The chrome steel construction provides durability, while the standard radial clearance ensures smooth operation.
Its dynamic thrust rating of 21,400 lbf allows for reliable performance under demanding conditions.
The open seal type simplifies maintenance, reducing downtime.

Engineered for Reliability: 8578-8522 Bearing

8578-8522 Bearing’s precision design includes a steel cage that maintains roller alignment under stress.
The chrome steel rollers and rings enhance wear resistance, ensuring long service life.
With a static radial load capacity of 240,000 lbf, it handles extreme loads with ease.
Its ABEC-1 rating guarantees consistent performance in industrial applications.

Application

Common Applications of 8578-8522 Bearing
8578-8522 Bearing is widely used in heavy machinery, such as construction equipment and mining rigs, where its tapered roller design handles combined radial and thrust loads effectively. The chrome steel construction ensures durability even in demanding environments.

In the automotive sector, 8578-8522 Bearing is often found in truck wheel hubs and differential systems, providing reliable performance under high loads. Its imperial sizing makes it a convenient choice for North American vehicle manufacturers.

For industrial gearboxes, 8578-8522 Bearing’s open design allows for easy lubrication, extending service life in continuous operation scenarios. The steel cage adds stability, reducing wear during high-speed rotations.

Where Is 8578-8522 Bearing Used?
8578-8522 Bearing is commonly seen in agricultural machinery, supporting components like tractor axles and harvesters. Its robust design withstands dirt and debris exposure typical in farm environments.

The bearing also plays a key role in railway applications, particularly in freight car wheel assemblies. Its ability to handle heavy loads and vibrations makes it suitable for long-distance transport.

Built for Heavy-Duty Use: 8578-8522 Bearing
8578-8522 Bearing excels in oilfield equipment, such as drilling rigs and pumps, where its high static radial load capacity is crucial. The standard radial clearance allows for thermal expansion in variable temperatures.

In wind turbine systems, 8578-8522 Bearing supports the main shaft, offering reliable performance despite constant directional changes. The ABEC-1 rating ensures sufficient precision for renewable energy applications.

Automotive vs Aerospace: Applications of 8578-8522 Bearing
While 8578-8522 Bearing is popular in truck transmissions, its weight limits aerospace use to ground support equipment. The bearing’s 25.4 lb mass makes it impractical for airborne applications.

In marine environments, 8578-8522 Bearing serves well in ship propulsion systems, where its corrosion-resistant materials withstand saltwater exposure. The inch measurements simplify maintenance for international vessels.

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