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Double Row Cylindrical Roller Bearings

Double row cylindrical roller bearings are divided into bearings with cylindrical bore and tapered bore (add K behind bearing type). This type of roller bearings have compact structure, good rigidity, heavy load carrying capacity, and little distortion under loads. Because of their second row of rollers, double row cylindrical roller bearings are suitable for heavy radial loads. Double row cylindrical roller bearings are applicable for the machine tool spindle. Tapered inner bore could fine adjust clearance, simplify positioning fixture and be convenient to mount and dismount.

Depending on the existence of ribs on their rings, double row cylindrical roller bearings are classified into NN, NNU types.

Type NN double row cylindrical roller bearings have two integral flanges on the inner ring, a flangeless outer ring and a center flange in the middle. Double-row cylindrical roller bearings permit axial displacement in double directions of the housing relative to the shaft.

Type NNU double row cylindrical roller bearings have two integral flanges on the outer ring, a non-contacting inner ring and a center flange in the middle. Double row cylindrical roller bearings permit axial displacement in double directions of the housing relative to the shaft. Therefore, this type of bearing is suitable to be used as non-locating bearings.

Cylindrical Bore

Cylindrical Bore

Tapered Bore

Tapered Bore

Cylindrical Bore

Cylindrical Bore

Tapered Bore

Tapered Bore

double-row-cylindrical-roller-bearing.gif

Bearing No. Boundary Dimensions Basic Loading Ratings Limited Speeds Mass
mm (KN) rpm (kg)
d D B r1, r2
min.
F E Cr Cor Grease Oil approx.
NNU4920 100 140 40 1.1 112 162.75 324.5 4320 5600 1.98
NNU4924/W33 120 165 45 1.1 133.5 192.15 396 3456 4480 2.4
NN3024K/W33 180 46 2 165 250.95 455.5 3456 4256 3.85
NN3026 130 200 52 2 182 298.2 522.5 3240 4032 5.54
NNU4928K/W33 140 190 50 1.5 154 297.15 643.5 3024 4032 4.09
NN3028 210 53 2 192 312.9 566.5 3024 3808 6.05
NNU4930/W33 150 210 60 2 167 367.5 786.5 2808 3584 6.39
NNU4930KW33 210 60 2 167 367.5 786.5 2808 3584 6.39
NNU4932/W33 160 220 60 2 177 383.25 836 2592 3360 6.47
NNU4932K/W33 220 60 2 177 383.25 836 2592 3360 6.46
NN3032K 240 60 2..1 219 393.75 726 2592 3136 8.39
NN3034K/W33 170 260 67 2.1 236 472.25 885.5 2376 2912 12.9
NNU4936/W33 180 250 68 2 200 504 1155 2376 2912 10.4
NNU4940/W33 200 280 80 2.1 223 598.5 1342 2052 2688 14.1
NN3040 310 82 2.1 282 687.75 1287 1944 1464 22.1
NNU4844K/W33 220 300 80 2.1 243 630 1463 1836 2464 16.6
NN3044 340 90 3 210 855.75 1628 1836 2240 31
NN3048 240 360 92 3 330 897.75 1760 1620 2016 31.6
NNU4952/W33 260 360 100 2.1 289 981.75 2310 1512 2016 29.2
NN3052K 400 104 4 364 1081.5 2112 1512 1904 49.3
NN3056 280 420 106 4 384 1134 2288 1404 1680 52.3
NN3060 300 460 118 4 418 1354.5 2706 1296 1568 77.9
NN3068K 340 520 133 5 473 1753.5 3630 1080 1344 101
NN3072 360 540 134 5 493 1785 3795 1026 1344 107
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