Four-row tapered roller bearings

RKB four-row tapered roller bearings are produced mainly in TQO and TQI configuration, in open or closed version. Supplied with the required axial internal clearance (BEP), they are mainly employed on work rolls of rolling mill applications. The use of high quality raw materials, special heat treatments, and innovative sealing solutions are at the base of their superior operating reliability and longer service life expectancy.

Main types

  • Type TQO1

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones, plus one cone spacer (plain or with lubrication holes)
    • Four one-piece window type steel cages
    • Supports radial and axial loads in both directions
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQITE

    • Two double cup, plus one cup spacer (plain or with lubrication grooves and holes)
    • One double cone, two single cones featuring tapered bore
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
    • With extended inner ring on one side for radial shaft seal
  • Type TQO2

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones, plus one cone spacer (plain or with lubrication holes)
    • Four two-piece steel pin-type cages
    • Pierced roller execution to increase load rating capacities
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQOT

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two two double cones, plus one cone spacer (plain or with lubrication holes)
    • Four one-piece window type steel cages
    • Supports radial and axial loads in both directions
    • Preset or adjusted BEP on customer’s request
    • Tapered bore
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQO3

    • One double cup, two single cups
    • Two double cones
    • Four one-piece window type pressed steel cages
    • Supports radial and axial loads in both directions
    • Available with helical groove in the bore (G)
    • Lubrication grooves in double cone side faces
    • Marked zones on cups sides face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQOS1

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Marked zones on cups side face to facilitate mounting and maintenance operations
    • Lateral flanges with lip seals and o-rings on bearing both sides
    • Designed with Anti-Vortex System cone spacer seal set
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQOE

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones, plus one cone spacer (plain or with lubrication holes)
    • Four one-piece window type steel cages
    • With extended inner ring on both sides for radial shaft seals
    • Supports radial and axial loads in both directions
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQOS2

    • One double cup, two single cups plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones with three ribs
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Marked zones on cups side faces to easy mounting and maintenance operations
    • Lateral flanges, concentric to the single cups, with improved seal lip and O-rings
    • Designed with Anti-Vortex System cone spacer seal set
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type SET 2xTDI

    • Four ribless cups plus three spacers (plain or with lubrication grooves and holes)
    • Two double cones with three ribs
    • Four pin-type cages
    • Preset or adjusted BEP on customer’s request
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Better internal distribution of the external loads due to the four single cups compared with TQO design
    • Optimized roller profile
  • Type TQOS3

    • One double cup, two single cups with integrated lateral flanges, featuring O-ring and rotating lip seals
    • Two double cones with three ribs
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Designed with Anti-Vortex System cone spacer seal set
    • Available in metric and inch sizes
    • Completely sealed (re-lubrication process is not possible!)
    • Optimized roller profile
  • Type TQI

    • Two double cup, plus one cup spacer (plain or with lubrication grooves and holes)
    • One double cone, two single cones
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQOES

    • One double cup, two single cups, plus two cup spacers (plain or with lubrication grooves and holes)
    • Two double cones with extended inner ring on both sides for radial shaft seals
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Marked zones on cups side face to facilitate mounting and maintenance operations
    • Lateral flanges with lip seals and o-rings on bearing both sides
    • Designed with Anti-Vortex System cone spacer seal set
    • Available in metric and inch sizes
    • Optimized roller profile
  • Type TQIT

    • Two double cup, plus one cup spacer (plain or with lubrication grooves and holes)
    • One double cone, two single cones featuring tapered bore
    • Four one-piece window type steel cages
    • Preset or adjusted BEP on customer’s request
    • Available with helical groove in the bore (G)
    • Marked zones on cups side face to easy mounting and maintenance operations
    • Available in metric and inch sizes
    • Optimized roller profile