Double-Row Cylindrical Roller Bearings

The double-row cylindrical roller bearing is especially suitable for machine tool spindle bearing. It is designed to have a compact structure, additional strength in carrying radial loads, and small deformation under load. The tapered bore can be used for micro-adjustment of clearance. It also simplifies structure of positioning device, which makes the bearing easy to be installed and removed.

The Double row cylindrical roller bearing has two variants as below. The types with tapered bore have codes plus “K” at the end.

圆柱滚子轴承21

1. NN type double-row cylindrical roller bearing
NN type is designed to have a compact structure and small deformation under load. So it is suitable for machine tool spindle bearing. It does not have outer flange, so you can install outer and inner components separately (with roller and cage). It does not limit the axial displacement of shaft or housing. Compared with the single row cylindrical roller bearing with same radial dimensions, the double-row cylindrical roller bearing can carry greater radial load.

2. NNK type double row tapered bore cylindrical roller bearings
NNK type is designed to have a compact structure and small deformation under load. So it is suitable for machine tool spindle bearing. Bearing bore is tapered for micro-adjustment of radial clearance. It does not limit the axial displacement of shaft or housing. Compared with single row cylindrical roller bearing with same radial dimensions, double-row cylindrical roller bearing can carry greater radial load.

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Main Technical Parameters of Double-Row Cylindrical Roller Bearings

Types Basic Sizes Basic load ratings (kN) Limit speed (rpm) Weight (kg)
dxDxB Dynamic (Cr) Static (Cor) Grease lubricating Oil lubricating
NN 3020/W33 100x150x37 153 292 3600 4500 2.18
NN 3020K/YA8W33 100x150x37 153 292 3600 4500 2.17
NNU 4020/YA8 100x150x50 178 315 3600 4500 3.11
NNU 4920S 100x140x40 155 300 3600 4500 1.98
NN 3021 105x160x41 192 350 3400 4300 2.94
NN 3022K 110x170x45 220 405 3200 4000 3.73
NN 3022/YA8 110x170x45 220 405 3200 4000 3.74
NN 3024/W33 120x180x46 243 445 3200 4000 3.85
NN 3026 130x200x52 280 530 2800 3600 5.54
NN 3028 140x210x53 293 575 2600 3400 6.05
NNU 3028/W33 140x210x53 293 575 2600 3400 6.18
NN 3030K 150x225x56 330 650 2400 3200 7.80
NN 3032K 160x240x60 345 675 2200 3000 8.39
NNP 4232 160x290x122 935 1770 1660 2050 36.3
NN3034K 170x260x67 435 860 2200 3000 12.9
NN 3036/W33 180x280x74 555 1090 2000 2800 16.9
NN 3038K 190x290x75 565 1140 1900 2600 17.1
NN 3040K 200x310x82 675 1340 1900 2400 22.0
NN 3044K 220x340x90 795 1610 1800 2200 30.1
NNU 4944X2/W33 220x300x112 705 1450 1850 2200 23.9
NN 3048K 240x360x92 810 1690 1700 2000 31.6
NNCL 4848 240x300x60 480 780 1750 2100 9.88
NN 3056K 280x420x106 1060 2290 1550 1800 49.7
NNU 4156 280x460x180 2390 4790 860 1050 118
NN 3060K 300x460x118 1290 2790 1320 1680 76.2
NNU 3164 320x540x176 2450 4700 750 920 163
NNU 4164F 320x540x218 3000 6080 750 920 210
NN 4964/W33 320x440x118 980 2780 850 1050 55.5
NN 4968/W33 340x460x118 1030 2980 805 995 58.5
NN 3072K/W33 360x540x134 1760 3900 710 880 105
NNU 4172 360x600x243 3580 7600 670 830 280
NNCF 4872V 360x440x80 745 2330 650 800 26.5
NN 3076K 380x560x135 1930 4060 680 850 116
NNU 4180/W33 400x650x250 4700 9550 530 650 319
NNU 40/500/W33 500x720x218 3830 8980 450 565 287
NN30/560K 560x820x195 3380 8170 600 850 337
NN 30/600K/W33 600x870x200 4050 9850 600 800 384
NN 48/630 630x850x150 2350 7240 360 445 242
NNU 49/670/W33X 670x900x230 4080 12000 335 420 423
NNU 49/750/W33X 750x1000x250 4610 14200 300 370 561
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