Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of precision cylindrical roller bearing nn3008 in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.
Double Row Precision Cylindrical Roller Bearing NN3008KW33/P5
A precision cylindrical roller bearing is composed of four core parts: inner ring, outer ring, cylindrical roller elements and bearing retainer. The inner and outer rings provide rigid raceways for precise rotation and load bearing. Evenly arranged cylindrical rollers undertake main radial loads with low friction. The retainer keeps rollers evenly spaced, preventing friction and offset, ensuring stable, high-precision and high-speed operation.
| Brand | Complete Model | Notes |
|---|---|---|
| NSK(Original) | NN3008KW33/P5 | Taper bore 1:12, outer‑ring oil groove & 3 oil holes(W33), machined brass cage, P5 precision |
| FAG(Schaeffler) | NN3008‑AS‑K‑M‑SP‑W33 | K‑taper bore; M‑brass cage; SP=P5 precision; W33 outer ring lubrication feature |
| SKF | NN3008K/W33‑SP | K‑1:12 taper bore, W33 oil groove & holes, SP(P5) precision, machined brass cage |
| NTN | NN3008K‑W33/P5 | 1:12 tapered bore, W33 lubrication feature, brass cage, P5 precision |
| KOYO | NN3008K‑W33/P5 | Taper bore K, W33 outer‑ring oil groove, P5 spindle‑grade precision |
Specifications
|
Bearing Type: |
Precision cylindrical roller bearing NN3008K |
|
Dimensions (dxDxB): |
30*55*199mm (NN3008) |
|
Material: |
100% Chrome Steel for higher resistance and durability material |
|
Retainer: |
Steel or brass |
| Precision: | P5, P4 |
| Lubrication: | Oil or grease |
|
Bearing No. |
Dimension (mm) |
Load rating (KN) |
Limit speed (r/min) |
Radial stiffness Rr |
Weight |
||||||||
|
d |
D |
B |
r (min) |
E |
Ns |
s |
Cr |
Cor |
grease |
oil |
KN/um |
kg |
|
|
NN3006K |
30 |
55 |
19 |
1 |
48.5 |
4.8 |
1.4 |
29 |
34 |
16000 |
19000 |
0.6 |
0.19 |
|
NN3007K |
35 |
62 |
20 |
1 |
55 |
4.8 |
1.4 |
35.5 |
44 |
14000 |
17000 |
0.7 |
0.25 |
|
NN3008K |
40 |
68 |
21 |
1 |
61 |
4.8 |
1.4 |
45 |
58.5 |
12000 |
15000 |
0.9 |
0.31 |
|
NN3009K |
45 |
75 |
23 |
1 |
67.5 |
4.8 |
1.7 |
54 |
72 |
11000 |
14000 |
1 |
0.4 |
|
NN3010K |
50 |
80 |
23 |
1 |
72.5 |
4.8 |
1.7 |
57 |
80 |
10000 |
13000 |
1.1 |
0.41 |
|
NN3011K |
55 |
90 |
26 |
1.1 |
81 |
4.8 |
1.9 |
72 |
100 |
9000 |
11000 |
1.3 |
0.65 |
|
NN3012K |
60 |
95 |
26 |
1.1 |
86.1 |
4.8 |
1.9 |
75 |
110 |
8500 |
10000 |
1.4 |
0.67 |
|
NN3013K |
65 |
100 |
26 |
1.1 |
91 |
4.8 |
1.9 |
76.5 |
116 |
8000 |
9500 |
1.4 |
0.74 |
|
NN3014K |
70 |
110 |
30 |
1.1 |
100 |
6.5 |
2.3 |
98 |
150 |
7000 |
8500 |
1.6 |
1.07 |
Precision cylindrical roller bearing is designed for the most demanding high-speed spindle applications, it reliably handle heavy radial loads while delivering superior accuracy. Sometines, even P4 is necessary.
Applications
Our double-row cylindrical roller bearings feature high rigidity, low heat generation, superior high-speed stability and long service life. Designed for heavy-duty continuous operation, they support high-precision and high-reliability applications across machine tools, aerospace, medical equipment and high-end industrial machinery.
1. Precision Machine Tool Industry
Serving as core spindle components for CNC lathes, machining centers and grinding spindles, the bearings feature high rigidity to suppress vibration and spindle deflection. With low heat generation, they maintain stable precision during long-term operation, optimizing machining accuracy and production quality for precision processing equipment.
2. Automotive Precision Manufacturing
Ideal for automated production lines and precision spindles in automotive manufacturing, the bearings support the processing of engine, transmission and chassis parts. Their excellent load resistance and operational stability adapt to high-frequency continuous production, guaranteeing consistent machining precision and batch product quality.
Advantages
HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.
∗ 2 high-tech R&D centers
∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.
∗ Supported by advanced digital MES and SPC management systems
∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications
About HXB
1. Hangzhou Factory - YJB
Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.
Core Capabilities & Intelligent Manufacturing
- Product Size: Inner diameter Φ3–Φ300mm
- Precision Classes: P2, P4 (ultra-precision grades)
- Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.
2. Huzhou Factory
In 2021, the deep groove ball bearing factory relocated from Hangzhou to Huzhou. It operate in a 10,000㎡ production facility with a team of 75 employees, focused on the R&D, and manufacturing of high-performance deep groove ball bearings.
We maintain a professional engineering and quality system to ensure stable precision and reliability.
Certificates
Exhibition
FAQ
Q1: What causes high temperature of machine tool bearings during operation?
A: Common reasons include excessive preload, insufficient or deteriorated lubricating grease, foreign particle contamination, improper installation clearance, and long-term over-speed or over-load operation. Our precision cylindrical roller bearings adopt low-friction optimized structure and heat-resistant grease, which can effectively control temperature rise and avoid thermal expansion failure under standard working conditions.
Q2: What precision grades are available for machine tool cylindrical roller bearings?
A: Our machine tool cylindrical roller bearings are available in multiple precision grades including P0, P6, P5 and P4. High-end CNC spindles and ultra-precision machining equipment usually adopt P5/P4 high-precision grades to ensure ultra-low runout and high rotational accuracy, while general industrial equipment can choose P6/P0 grades for cost-effective matching.
Q3: Why do precision bearings produce abnormal noise after installation?
A: Abnormal noise is usually caused by unprofessional installation, improper preload adjustment, dust and impurity entering the bearing, grease deterioration, or spindle shaft bending and poor matching tolerance. It is not a quality problem of the bearing itself in most cases. Standard installation and clean assembly environment can effectively avoid noise failure.
Q4: Can precision cylindrical roller bearings be reused after disassembly?
A: It is not recommended for high-precision machine tool equipment. Disassembly will change the original factory preload and internal clearance, and may cause invisible wear on raceways and rolling elements. For precision spindles, disassembled bearings are usually only used for ordinary low-precision equipment to avoid accuracy loss and vibration problems.
Q5: How to store precision machine tool bearings correctly?
A: Precision bearings need to be stored in a dry, constant-temperature and dust-free environment, avoiding humid air, rust and dust adhesion. Do not squeeze or stack bearings heavily to prevent deformation. Unused bearings should keep their original packaging sealed. Long-term exposure will affect internal grease performance and bearing precision, resulting in unstable operation after installation.
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