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Series NN-Double Row Cylindrical Roller Bearings OEM/ODM

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Series NN-Double Row Cylindrical Roller Bearings

  • NNU...W33
  • NNU...K/W33
  • NN...W33
  • NN...K/W33
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  • Design Variants
  • Misalignment
  • Cage
  • Tolerance
  • Internal clearance
Model 
 Dimensions Rated load Extreme speed Bearing dimensions Weight
d
D
B
 r1 r2 min Dynamic load Static load Grease lubrication Oil lubrication E F Bs ≈ S ≈ ≈
NN 3006 M/W33
30
55
19
 1 29 34 16000 19000 48.5 -- 4.8 1.4 0.12
NN 3006 K/M/W33
30
55
19
 1 29 34 16000 19000 48.5 -- 4.8 1.4 0.12
NN 3007 M/W33
35
62
20
 1 35.5 44 1400 1700 55 -- 4.8 1.4 0.26
NN 3007 K/M/W33
35
62
20
 1 35.5 44 1400 1700 55 -- 4.8 1.4 0.26
NN 3008 M/W33
40
68
21
 1 45 58.5 12000 15000 61 -- 4.8 1.4 0.32
NN 3008 K/M/W33
40
68
21
 1 45 58.5 12000 15000 61 -- 4.8 1.4 0.32
NN 3009 M/W33
45
75
23
 1 54 72 11000 14000 67.5 -- 4.8 1.7 0.41
NN 3009 K/M/W33
45
75
23
 1 54 72 11000 14000 67.5 -- 4.8 1.7 0.41
NN 3010 M/W33
50
80
23
 1 57 80 10000 13000 72.5 -- 4.8 1.7 0.43
NN 3010 K/M/W33
50
80
23
 1 57 80 10000 13000 72.5 -- 4.8 1.7 0.43
NN 3011 M/W33
55
90
26
 1.1 72 100 9000 11000 81 -- 4.8 1.9 0.65
NN 3011 K/M/W33
55
90
26
 1.1 72 100 9000 11000 81 -- 4.8 1.9 0.65
NN 3012 M/W33
60
95
26
 1.1 75 110 8500 10000 86.1 -- 4.8 1.9 0.67
NN 3012 K/M/W33
60
95
26
 1.1 75 110 8500 10000 86.1 -- 4.8 1.9 0.67
NN 3013 M/W33
65
100
26
 1.1 76.5 116 8000 9500 91 -- 4.8 1.9 0.74
NN 3013 K/M/W33
65
100
26
 1.1 76.5 116 8000 9500 91 -- 4.8 1.9 0.74
NN 3014 M/W33
70
110
30
 1.1 98 150 7000 8500 100 -- 6.5 2.3 1.1
NN 3014 K/M/W33
70
110
30
 1.1 98 150 7000 8500 100 -- 6.5 2.3 1.1
NN 3015 M/W33
75
115
30
 1.1 100 156 6700 8000 105 -- 6.5 2.3 1.1
NN 3015 K/M/W33
75
115
30
 1.1 100 156 6700 8000 105 -- 6.5 2.3 1.1
NN 3016 M/W33
80
125
34
 1.1 120 186 6300 7500 113 -- 6.5 2.5 1.6
NN 3016 K/M/W33
80
125
34
 1.1 120 186 6300 7500 113 -- 6.5 2.5 1.6
NN 3017 M/W33
85
130
34
 1.1 125 200 6000 7000 118 -- 6.5 2.5 1.6
NN 3017 K/M/W33
85
130
34
 1.1 125 200 6000 7000 118 -- 6.5 2.5 1.6
NN 3018 M/W33
90
140
37
 1.5 140 224 5600 6700 127 -- 6.5 2.5 2.1
NN 3018 K/M/W33
90
140
37
 1.5 140 224 5600 6700 127 -- 6.5 2.5 2.1
NN 3019 M/W33
95
145
37
 1.5 143 236 5300 6300 132 -- 6.5 2.5 2.3
NN 3019 K/M/W33
95
145
37
 1.5 143 236 5300 6300 132 -- 6.5 2.5 2.3
NN 3020 M/W33
100
150
37
 1.5 146 245 5300 6300 137 -- 6.5 2.5 2.2
NN 3020 K/M/W33
100
150
37
 1.5 146 245 5300 6300 137 -- 6.5 2.5 2.2
NN 3021 M/W33
105
160
41
 2 190 310 4800 5600 146 -- 6.5 2.6 3
NN 3021 K/M/W33
105
160
41
 2 190 310 4800 5600 146 -- 6.5 2.6 3
NN 3022 M/W33
110
170
45
 1.1 220 360 4500 5300 155 -- 6.5 2.8 3.8
NN 3022 K/M/W33
110
170
45
 2 220 360 4500 5300 155 -- 6.5 2.8 3.8
NN 3024 M/W33
120
180
46
 2 232 390 4300 5000 165 -- 6.5 3.1 4.1
NN 3024 K/M/W33
120
180
46
 2 232 390 4300 5000 165 -- 6.5 3.1 4.1
NN 3026 M/W33
130
200
52
 2 290 500 3800 4500 182 -- 9.5 3.35 6.1
NN 3026 K/M/W33
130
200
52
 2 290 500 3800 4500 182 -- 9.5 3.35 6.1
NN 3028 M/W33
140
210
53
 2 300 520 3600 4300 192 -- 9.5 3.35 6.5
NN 3028 K/M/W33
140
210
53
 2 300 520 3600 4300 192 -- 9.5 3.35 6.5
NN 3030 M/W33
150
225
56
 2 335 585 3400 4000 206 -- 9.5 3.7 7.9
NN 3030 K/M/W33
150
225
56
 2 335 585 3400 4000 206 -- 9.5 3.7 7.9
NN 3032 M/W33
160
240
60
 2.1 375 670 3200 3800 219 -- 9.5 4.2 9.6
NN 3032 K/M/W33
160
240
60
 2.1 375 670 3200 3800 219 -- 9.5 4.2 9.6
NN 3034 M/W33
170
260
67
 2.1 450 800 3000 3600 236 -- 9.5 4.5 13
NN 3034 K/M/W33
170
260
67
 2.1 450 800 3000 3600 236 -- 9.5 4.5 13
NN 3036 M/W33
180
280
74
 2.1 570 1000 2800 3400 255 -- 12.2 4.8 17
NN 3036 K/M/W33
180
280
74
 2.1 570 1000 2800 3400 255 -- 12.2 4.8 17
NN 3038 M/W33
190
290
75
 2.1 585 1040 2600 3200 265 -- 12.2 4.8 18
NN 3038 K/M/W33
190
290
75
 2.1 585 1040 2600 3200 265 -- 12.2 4.8 18
NN 3040 M/W33
200
310
82
 2.1 655 1200 2400 3000 282 -- 12.2 5.3 23
NN 3040 K/M/W33
200
310
82
 2.1 655 1200 2400 3000 282 -- 12.2 5.3 23
NN 3044 M/W33
220
340
90
 3 800 1460 2200 2800 310 -- 15 4.5 33
NN 3044 K/M/W33
220
340
90
 3 800 1460 2200 2800 310 -- 15 4.5 33
NN 3048 M/W33
240
360
92
 3 850 1560 2000 2600 330 -- 15 6 36
NN 3048 K/M/W33
240
360
92
 3 850 1560 2000 2600 330 -- 15 6 36
NN 3052 M/W33
260
400
104
 4 1060 2000 1900 2400 364 -- 15 6.5 48
NN 3052 K/M/W33
260
400
104
 4 1060 2000 1900 2400 364 -- 15 6.5 48
NN 3056 M/W33
280
420
106
 4 1080 2080 1800 2200 384 -- 15 6.75 52
NN 3056 K/M/W33
280
420
106
 4 1080 2080 1800 2200 384 -- 15 6.75 52
NN48/750K30/HB1/W33
750
920
170
 -- 3690 10200 -- 600 879 -- 22.3 6.7 240
NN48/750/HB1/W33
750
920
170
 -- 3690 10200 -- 600 879 -- 22.3 6.7 240
NN49/1000K30/M/W33
1000
1320
315
 -- 8580 26000 -- 400 1238 -- 22.3 9.5 1200
NN49/1000M/W33
1000
1320
315
 -- 8580 26000 -- 400 -- -- 22.3 9.5 1200
NN49/1320K/FB/W33
1320
1720
400
 -- 13800 42500 -- 280 1620 -- 22.3 16.8 3060
NN49/1320FB/W33
1320
1720
400
 -- 13800 42500 -- 280 1620 -- 22.3 16.8 3060

Ningbo DHK Precision Bearing Co., Ltd.

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    Patented Technology

Ningbo DHK Precision Bearing Co., Ltd. (“DHK” for short) is a specialist enterprise engaged in the R&D, manufacture and sales of bearings. Is a famous China Series NN-Double Row Cylindrical Roller Bearings Factory and OEM/ODM Series NN-Double Row Cylindrical Roller Bearings Company. And is located in Ningbo Zhenhai Economic Development Zone with convenient transportation. Since the establishment for over a decade, "technology", "quality" and "service" have always been the initial issues in our mind for the sake of development. We provide reliable products and special customized services for global enterprises in heavy industry and have got the Satisfaction and won good reputation of a number of enterprises at home and abroad.

DHK mainly produces cylindrical roller bearings, conical roller bearings, self-aligning roller bearings, ball bearings, as well as various kinds of non-standard bearings and bearings with specially treated surface. So far, DHK’s bearings have been widely applied in such fields as engineering machinery, industrial pump, machine tool, compression engine, gear case, wind power and metallurgy in developed European and American countries.

DHK has the measuring room and inspection room of bearings in the industry and has introduced top-end inspection equipment worldwide and established the QC system in China,thus guaranteeing product quality in an all-round way.

Ningbo DHK Precision Bearing Co., Ltd.

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CERTIFICATE

DHK has passed IATF16949 quality system certification and ISO14001 environmental management system certification；and DHK is a national high-tech enterprise.

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  • Environmental Managementsystem Certificate
  • Measurement Management System

Latest News

Industry Knowledge Expansion

1. Construction and Design Features of Series NN-Double Row Cylindrical Roller Bearings
The Series NN-Double Row Cylindrical Roller Bearings embody the careful fusion of engineering principles and advanced materials, their construction begins with the precise machining of high-quality bearing steel to form the inner and outer rings. The inner ring boasts three integral flanges strategically positioned to confer exceptional axial rigidity, thereby minimizing the risk of misalignment and deflection under heavy loads. These flanges also serve to facilitate axial location within the bearing housing, ensuring precise positioning for optimal performance. Within the bearing assembly, two rows of cylindrical rollers are meticulously arranged in a parallel configuration. Each roller is precision-engineered to exacting tolerances, ensuring uniform load distribution across the bearing's width. This symmetrical design not only enhances load-carrying capacity but also mitigates the risk of roller skewing, thereby promoting smooth and efficient operation even under dynamic conditions. The absence of an outer ring flange simplifies the mounting process, allowing for easier installation and removal during maintenance procedures. This streamlined design feature offers practical benefits, particularly in applications where frequent bearing replacement or servicing is required. The intricate interplay of these design elements results in a robust bearing assembly capable of withstanding heavy radial and axial loads while maintaining exceptional rigidity and precision. Whether deployed in high-speed machine tool spindles or rugged industrial gearboxes, Series NN-Double Row Cylindrical Roller Bearings exemplify the pinnacle of engineering excellence, providing a reliable foundation for critical machinery across a myriad of industries.

2. Lubrication and Maintenance Considerations
Effective lubrication lies at the heart of ensuring optimal performance and longevity for Series NN-Double Row Cylindrical Roller Bearings. Proper lubrication serves to minimize friction and wear, thereby reducing heat generation and extending the bearing's service life. The choice of lubricant depends on various factors, including operating speed, temperature, and environmental conditions. For low to moderate speed applications, grease lubrication is commonly employed due to its simplicity and cost-effectiveness. High-quality lithium or calcium-based greases with EP (extreme pressure) additives are preferred for their ability to withstand heavy loads and provide reliable lubrication over extended periods. In high-speed applications or environments with elevated temperatures, oil lubrication may be preferred for its superior cooling and lubricating properties. Oil bath, circulating oil, or oil mist lubrication systems can be utilized to ensure consistent lubricant delivery to the bearing assembly, thus minimizing frictional losses and maximizing efficiency. Regular maintenance practices, including periodic lubricant replenishment and condition monitoring, are essential for preserving bearing health and performance. Monitoring parameters such as lubricant viscosity, temperature, and vibration levels can provide valuable insights into bearing condition, allowing for proactive maintenance interventions to prevent costly downtime and equipment failures.