Super Tough.
Built for Metals.

NSK Sealed-Clean Four-Row Tapered Roller Bearings with Super-TF Steel

For the machinery that drives steel production, operating conditions are punishing from end to end.

Staggering loads
Intense heat
Mechanical shock, misalignment, and thermal expansion
Extreme speeds, both high and low
Contamination from mill scale and water vapor

Applied^® carries the NSK solutions engineered to withstand it.

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NSK Super-TF Bearings

Long-life, extra-capacity work roll bearings for rolling mill stands.

10x

Longer Life Under Contamination

As much as 10 times longer life than general carburized bearing alternatives, with Super-TF Steel

35%

Higher Basic Load Rating

As much as 35% greater than conventional sealed bearings, from a compact seal and optimized internal design

1.6–2.7x

Longer Bearing Life

Advanced seal performance extends L10 life by 1.6 to 2.7 times and cuts water ingress to less than 1/3

Four-row tapered roller bearings must withstand the heavy and impact loads transmitted as steel thickness is reduced while passing through the work rolls in rolling mill stands, all while contending with severe contamination from mill scale and water ingress.

Engineered with long-life Super-TF steel and advanced sealing technologies, NSK Sealed-Clean Four-Row Tapered Roller Bearings deliver significantly higher durability and resistance to contamination. Advanced material and carbonitriding technologies add superior resistance to wear, seizure, and heat.

Applied^® carries the NSK line for steel mill work roll applications.

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NSK Sealed-Clean Four-Row Tapered Roller Bearing for steelmaking machinery

What Makes Super-TF Different

Material composition containing appropriate levels of chromium and molybdenum for increased hardness

Special heat treatment for retained austenite

Alleviates stress concentration on the contact surface

Optimized dispersion of finer carbide and carbonitride particles

Outstanding Performance Engineered In

NSK's Super-TF Four-Row Tapered Roller Bearings are engineered to withstand immense loads and contamination ingress to deliver long-life reliability.

High-Capacity Internal Design

Special high-capacity internal design built for the heaviest work roll loads.

Super-TF Steel

Long-life Super-TF steel for dramatically longer service life under contaminated operating conditions.

Spiral Grooved Bore

Spiral grooved inner ring bore prevents creeping wear damage on the roll neck shaft.

Heat- and Water-Resistant Seal

Advanced main seal design with a bore seal to stabilize internal pressure.

Machined Steel Cage

A machined steel cage built for the demands of continuous mill duty.

Phosphate-Coated Inner Ring

Corrosion-resistant phosphate coating on the inner ring.

Optimized Lubrication and Clearance

Outer ring lubrication grooves and holes, with special radial and axial internal clearances.

Inch and Metric Types

Available in inch and metric design types.

Seal Design Features

Main Seal and Holder

The heat- and water-resistant main seal and its holder make handling easier and minimize risk of seal damage.

High-Load Capacity Design

The compact main seal design permits optimization of the internal design and increasing bearing capacity.

Bore Seal

The bore seal prevents the build-up of negative pressure that can cause the entry of water through the main seals.

Available Sizes and Load Ratings

NSK Sealed-Clean Four-Row Tapered Roller Bearings are available in inch and metric design types, across a wide range of bore diameters and load ratings for rolling mill stands.

215.9 mm -
708.025 mm

Bore Diameter Range

Inch and metric design types

Up to 14,800,000 N

Dynamic Load Rating

Across the published bearing range

Up to 34,000,000 N

Static Load Rating