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Backing bearings(Sendzimr bearing) have been specially developed for cold rolling mills of the cluster type, but can also be used for other applications, e.g. straightening or bending machines. Backing bearings are roller bearings having a particularly thickwalled outer ring and can be mounted on stationary support shafts to form backup or straightening rolls. The forces from the work rolls are  transmitted via the support shaft and a system of support saddles to the roll or machine stands. 

The picture shows the arrangement of the backing bearings on the eight support shafts of a 20-roll mill.

HKT backing bearings for cluster mills are produced in many designs but are generally based on double or three-row cylindrical roller bearings. Single row needle roller bearing and double row tapered roller bearing designs are also available. The logarithmic contact profile between rollers and raceways produces a vastly improved stress distribution under all load conditions as well as when the bearing is misaligned under load.


Principal dimensions Basic load rating roller Maximum radial loads weight Type
dynamic static dynamic static
D d B C H C Co Fr For kgs  type
120 55 26 26 32.5 58.3 98 108 153 1.7 610627B
120 55 52.2 52 32.5 125 275 224 315 3.5 396040
160 70 90 90 44.98 358 585 315 455 10.5 315268B
160 70 90 90 44.98 314 475 300 425 12 315268BC
165 70 120 118 47.5 319 440 345 490 14.5 BCZ-0510
220 90 94 94 65 512 680 310 440 21.5 BC2B 319343B
220 90 120 120 65 528 900 425 600 27 316737A
220 90 120 120 64.98 594 930 450 640 30 316737AB
220 90 120 120 64.98 495 735 390 550 26.5 316737AC
220 90 120 120 65 473 765 400 570 26.5 316737D/HB1
220.02 90 96 94 65 457 550 335 480 20.5 BCZ-0508
220.02 90 120 119 65 484 640 430 620 26 BCZ-0507
225 100 120 120 62.48 660 1120 560 800 28 315018A
225 100 120 120 62.48 572 930 530 750 24.5 315018C
225 100 120 118 62.5 616 815 380 550 26.1 BC2B326495A/HB1
225 100 120 119 62.48 594 815 405 570 26.9 BCZ-0011
225 100 120 118 62.48 495 680 465 655 27 BCZ-0509
260 110 98 98 74.98 968 1430 415 585 31 BC2B-322564
260 110 110 109 74.98 561 695 440 620 33.5 BCZ-0504
300 130 172.496 169.321 85 990 1820 649 927 64.5 BT2B332573C
300 130 172.64 172.64 84.97 1280 2040 865 1220 82 314833A
300 130 172.64 172.64 84.97 1170 1800 830 1180 72.5 314833B
300.02 130 160 159.5 85.01 1100 1860 800 1120 65.5 319028
406.4 180 171.04 170 113.2 1400 2200 980 1400 130 BNTB322758/HB1
406.4 180 224 224 113.2 1570 3000 1930 2750 175 BNTB322891/HB2
406.4 180 224 223 113.2 1760 2900 1290 1860 170 BNTB326074B/HB1
406.4 180 224 223 113.2 1760 2900 1290 1860 170 BNTB326074/HB1
406.42 180 171 171 113.2 1510 2650 1060 1500 130 316388AV
406.42 180 171 171 113.2 1420 2450 1040 1460 130 316388C
406.42 180 171 170 113.2 1300 1900 1000 1430 130 BC3B 319809
406.42 180 171 171 113.2 1420 2500 1290 1830 130 BC3B320899
406.42 180 171 171 113.2 1450 2400 1080 1530 130 BC3B326277/HB1
406.42 180 171.04 171.04 113.16 1510 2320 1180 1660 120 316388AB
406.42 180 217 217 113.2 1790 3200 1500 2160 165 315020A
406.42 180 217 217 113.16 1870 3100 1500 2120 165 315020AB
406.42 180 224 224 113.2 1830 3250 1530 2200 170 315515A
406.42 180 224 224 113.16 1900 3100 1530 2200 170 315515AB
406.42 180 224 224 113.2 1830 3250 1530 2200 170 315515B
406.425 180 223.83 220.665 113.2 1760 2650 1100 1570 152 BT2B332618A