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NSK Sealed-Clean Four-Row Tapered Roller Bearings: long-life, extra-capacity work roll bearings for rolling mill stands.

Staggering loads. Intense heat. Mechanical shock, misalignment, and thermal expansion. Extreme speeds, both high and low. Contamination from mill scale and water vapor. For the machinery that drives steel production, operating conditions are uniquely punishing end to end. Applied® carries the NSK bearings engineered to withstand it.

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Bearings for Steelmaking Machinery

Product development is focused on withstanding the operating stresses in furnaces, casting plants, and rolling mills.

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
2.7x
Longer Seal 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 Extra-Capacity Sealed-Clean Tapered Roller Bearings deliver significantly higher durability and resistance to contamination.

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

Applications

Rolling Mills
Work Rolls
Steelmaking
Casting Plants
Shop Four-Row Tapered Roller Bearings
NSK Sealed-Clean Four-Row Tapered Roller Bearing for steelmaking machinery

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

1

Main Seal and Holder

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

2

High-Load Capacity Design

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

3

Bore Seal

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

Water-Resistant AQGRD R1 Grease

Developed specifically for use with Sealed-Clean Four-Row Tapered Roller Bearings, NSK's long-life water-resistant grease, AQGRD R1, is elevated in base oil viscosity with special water-resistant additives.

Inhibits water entry to rolling contact surfaces
Minimizes premature flaking and rust
More than double bearing flaking life versus conventional grease
Reduces grease consumption and grease waste

High-Performance Factor: Super-TF Steel

Work roll bearings must endure heavy radial, axial, and impact loads, high temperatures, extreme speeds, and severe contamination with reliable, uninterrupted performance to achieve and augment production capacities. NSK's Super-TF Four-Row Tapered Roller Bearings deliver outstanding durability in response. Engineered with advanced material and carbonitriding technologies, they perform with superior resistance to wear, seizure, and heat.

What Makes Super-TF Steel Different

Material composition containing appropriate levels of chrome 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
Tandem cold rolling mill, the field-test application for NSK Super-TF bearings

Field Test: Twice the Operating Life, Over 1 Million Tons of Output

Application: work roll bearings, tandem cold rolling mill (4-high). In a field test, NSK bearings lubricated with AQGRD R1 grease delivered twice the operating life of conventional sealed roll neck bearings, resulting in over 1 million tons of output.

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
Across the published bearing range

Additional bearing designs and sizes, including open bearings, are available. Contact your Applied® representative for the full dimension and load rating tables.

DISCLAIMER: The above content is provided by the supplier. Applied® does not guarantee the accuracy or timeliness of the content.
The above content is provided “AS IS”, AND ANY AND ALL EXPRESS AND IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ARE HEREBY EXCLUDED.
All warranties, if any, are solely from the supplier.

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