Four-row tapered roller bearings are designed specifically to support the work rolls of rolling mill stands. As their purpose suggests, they are engineered to withstand heavy and impact loads transmitted – radially and axially – as steel passes through rolling stands and is reduced in thickness by the work rolls. They must also accommodate wide speed variations with rapid acceleration and deceleration.

Equally challenging to these bearings is the environment: not only high temperatures but mill scale contamination and water penetration as well. NSK four-row tapered roller bearings are available with long-life Super-TF steel to deliver superior durability and wear resistance. For aggressive environments, NSK’s Sealed-Clean design offers improved heat- and water-resistant sealing protection, promoting reduced grease consumption and maintenance costs.

PROVEN BENEFITS
Higher reliability and longer operating life with Super-TF steel, reducing bearing replacement and maintenance intervals
Sealed-Clean solution extends bearing performance, promotes a cleaner work environment and significantly reduces grease consumption
Advanced AQGRD grease for sealed-type bearings provides optimal water-resistance, preventing grease deterioration and bearing damage

DESIGN FEATURES

Special design high load capacity four-row tapered roller bearing
With long-life Super-TF steel for dramatically longer service life under contaminated operating conditions
With machined steel window- and pin-type cages
Spiral groove on the inner ring bore to prevent creeping wear on the roll neck shaft
Available as open or advanced heat- and water-resistant sealed-type bearings
Sealed version available with long-life AQGRD R1 water-resistant grease
Corrosion resistant phosphate option for inner ring
With special radial and axial internal clearances
Available in inch and metric design types