Needle Roller Bearing
What is Needle Roller Bearing?
Needle bearings are roller bearings with cylindrical rollers that are thin and long relative to their diameter. This type of roller is called a needle roller. Despite its smaller cross-section, the bearing still has a high load-bearing capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for support structures with limited radial installation dimensions.
Product Parameters Of Needle Roller Bearing
| New domestic models | Old domestic model | Inner diameter (mm) | Outer diameter (mm) | Width(mm) | Cr(kN) | Cor(kN) | Grease lubrication speed (r/min) | Oil lubrication speed (r/min) | Weight (kg) |
| NA6901 | 6544901 | 12 | 24 | 22 | 16.3 | 21.7 | 27000 | – | 0.045 |
| NA6902 | 65449O2 | 15 | 28 | 23 | 18.4 | 27.1 | 22000 | – | 0.062 |
| NA6903 | 6544903 | 17 | 30 | 23 | 18.9 | 29 | 20000 | – | 0.067 |
| NA6904 | 65449O4 | 20 | 37 | 30 | 35.4 | 48.9 | 17000 | – | 0.137 |
| NA6905 | 6544905 | 25 | 42 | 30 | 40.1 | 60.7 | 15000 | – | 0.162 |
| NA6906 | 6544906 | 30 | 47 | 30 | 42.7 | 69 | 13000 | – | 0.186 |
| NA6907 | 6254907 | 35 | 55 | 36 | 51.4 | 85.1 | 11000 | – | 0.297 |
| NA6908 | 6254908 | 40 | 62 | 40 | 66.7 | 115 | 9400 | – | 0.415 |
| NA6909 | 6254909 | 45 | 68 | 40 | 70.7 | 127 | 8800 | – | 0.496 |
| NA6910 | 6254910 | 50 | 72 | 40 | 74 | 140 | 7900 | – | 0.497 |
| NA6911 | 6254911 | 55 | 80 | 45 | 86.7 | 165 | 7300 | – | 0.711 |
| NA6912 | 6254912 | 60 | 85 | 45 | 90.8 | 179 | 6800 | – | 0.765 |
| NA6913 | 6254913 | 65 | 90 | 45 | 98.4 | 190 | 6400 | – | 0.798 |
| NA6914 | 6254914 | 70 | 100 | 54 | 132 | 271 | 5700 | – | 1.37 |
| NA6915 | 6254915 | 75 | 105 | 54 | 135 | 283 | 5400 | – | 1.44 |
| NA6916 | 6254916 | 80 | 110 | 54 | 140 | 304 | 5100 | – | 1.46 |
| NA6917 | 6254917 | 85 | 120 | 63 | 165 | 390 | 4600 | – | 2.29 |
| NA6918 | 6254918 | 90 | 125 | 63 | 167 | 403 | 4400 | – | 2.31 |
| NA6919 | 6254919 | 95 | 130 | 63 | 173 | 428 | 4200 | – | 2.43 |
| NA6920 | 6254920 | 100 | 140 | 71 | – | – | – | – | – |
| NAV4003 | 4074103 | 17 | 35 | 18 | – | – | – | – | 0.098 |
| NAV4004 | 4074104 | 20 | 42 | 22 | – | – | – | – | 0.175 |
| RNA6901 | 6644901 | 12 | 24 | 22 | 16.3 | 21.7 | 27000 | – | 0.03 |
| RNA6902 | 6644902 | 15 | 28 | 23 | 18.4 | 27.1 | 22000 | – | 0.038 |
| RNA6903 | 6644903 | 17 | 30 | 23 | 18.9 | 29 | 20000 | – | 0.04 |
| RNA6904 | 6644904 | 20 | 37 | 30 | 35.4 | 48.9 | 17000 | – | 0.096 |
| RNA6905 | 6644905 | 25 | 42 | 30 | 40.1 | 60.7 | 15000 | – | 0.112 |
| RNA6906 | 6644906 | 35 | 47 | 30 | 42.7 | 69 | 13000 | – | 0.126 |
| RNA6907 | 6354907 | 42 | 55 | 36 | 51.4 | 85.1 | 11000 | – | 0.182 |
| RNA6908 | 6354908 | 48 | 62 | 40 | 66.7 | 115 | 9400 | – | 0.247 |
| RNA6909 | 6354909 | 52 | 68 | 40 | 70.7 | 127 | 8800 | – | 0.334 |
| RNAV4005 | 4084105 | 33.5 | 47 | 22 | – | – | – | – | 0.129 |
| RNAV4006 | 4084106 | 40.1 | 55 | 25 | – | – | – | – | 0.193 |
| RNAV4007 | 4084107 | 45.9 | 62 | 27 | – | – | – | – | 0.259 |
| RNAV4008 | 4084108 | 51.6 | 68 | 28 | – | – | – | – | 0.304 |
| RNAV4009 | 4084109 | 57.4 | 75 | 30 | – | – | – | – | 0.39 |
| RNAV4010 | 4084110 | 62.1 | 80 | 30 | – | – | – | – | 0.426 |
| RNAV4011 | 4084111 | 69.8 | 90 | 35 | – | – | – | – | 0.645 |
| RNAV4012 | 4084112 | 74.6 | 95 | 35 | – | – | – | – | 1.025 |
| RNAV4013 | 4084113 | 80.3 | 100 | 35 | – | – | – | – | 0.692 |
| RNAV4014 | 4084114 | 88 | 110 | 40 | – | – | – | – | 0.982 |
| RNAV4015 | 4084115 | 92.7 | 115 | 40 | – | – | – | – | 1.025 |
| RNAV4016 | 4084116 | 100.3 | 125 | 45 | – | – | – | – | 0 |
| RNAV4902 | 4084902E | 20 | 28 | 13 | – | – | – | – | 0 |
| RNAV4903 | 4084903E | 22 | 30 | 13 | – | – | – | – | 0 |
| RNAV4904 | 4084904E | 25 | 37 | 17 | – | – | – | – | 0 |
| RNAV4905 | 4084905E | 30 | 42 | 17 | – | – | – | – | 0 |
| RNAV4906 | 4084906E | 35 | 47 | 17 | – | – | – | – | 0 |
| RNAV4907 | 4084907E | 42 | 55 | 20 | – | – | – | – | 0 |
| RNAV4908 | 4084908E | 48 | 62 | 22 | – | – | – | – | 0 |
| RNAV4909 | 4084909E | 52 | 68 | 22 | – | – | – | – | 0 |
| RNAV4910 | 4084910E | 58 | 72 | 22 | – | – | – | – | 0 |
| RNAV4912 | 4084912E | 68 | 85 | 25 | – | – | – | – | 0 |
| RNAV4914 | 4084914E | 80 | 100 | 30 | – | – | – | – | 0 |
| RNAV4916 | 4084916E | 90 | 110 | 30 | – | – | – | – | 0 |
| RNAV4918 | 4084918E | 105 | 125 | 35 | – | – | – | – | 0 |
| RNAV4919 | 4084919E | 110 | 130 | 35 | – | – | – | – | 0 |
| RNAV4920 | 4084920E | 115 | 140 | 40 | – | – | – | – | 0 |
Advantage Of Needle Roller Bearing
- Needle roller bearings have a large carrying capacity and are suitable for supporting structures with limited installation dimensions.
- The surface of the journal is hardened as the rolling surface, and the bearing is fitted into the seat hole with a press fit, and there is no need for it to be axially positioned.
- The bearing should be injected with an appropriate amount of grease before installation.
- Usually, no relubrication is required after assembly (BK type bearings are used in the support of the journal without the protruding end, the end face is closed for sealing, and can withstand small axial movement.)
Application Of Needle Roller Bearing
Needle roller bearings are widely used in automobiles, smelters, mines, steel plants, power plants, gas turbines, motor factories, printing, packaging machinery, food machinery, chemical fiber machinery, textiles, tobacco machinery, pharmaceutical equipment, engineering machinery, and other equipment.
Packaging Of Needle Roller Bearing
Shipping port: Qingdao/Tianjin
Supply Ability: 100,000 pieces per month
Package：
- Plastic bag + single box + carton + plywood pallet
- Neutral industrial packaging + neutral carton packaging + pallet
- According to customer requirements
Factory Of Needle Roller Bearing
The company adopts warehousing supply, has a large warehouse and sufficient spot inventory, and has an extensive marketing network. We can not only provide customers with high-quality products, reasonable prices, excellent pre-sales and after-sales services and professional technical consultation, but also Having a group of experienced sales and after-sales engineers can help your company eliminate worries in terms of equipment loading and unloading maintenance, maintenance testing, and technical consultation.
FAQ Of Needle Roller Bearing
Due to their internal design, ball bearings cannot usually be disassembled down to the component level; therefore, they cannot usually be refurbished.
The two biggest factors affecting the starting and running torque of the bearing are the seal design and lubricant selection. The shaft and bearing seat fit, component accuracy and surface finish, and retainer design also have some influence.
In higher speed applications, non-contact sealing devices are usually required to minimize operating torque and heat generation, so oil baffle rings and secondary sealing devices are usually required. Flowing oil lubrication systems are usually the best solution.
After proper installation, most seated bearings only need to be relubricated regularly with a small amount of grease and checked to ensure that they operate at low temperatures, quietness, and sufficient accuracy.
This depends on many factors, such as the application’s load conditions, operating speed, duty cycle, temperature, and operating environment. The technical information section of this website provides some basic information. Our engineers can help you determine more specific theoretical life calculations.
When noise and/or operating temperature increase or operating accuracy decreases, bearings should be replaced.
Lubricant of choice
Lubrication joint type or location
Sealing materials and design options
Dimensions, suitable for housing or insert
Fixing screw options
Paint the shell in any color
Too little or too much lubricant
Incorrect lubricant type
Poor bearing installation
Improper internal clearance
Excessive load and/or speed
Extreme temperature
Pollution
Movement between mounting surfaces
The noise emitted by the bearing may be caused by a combination of one or more factors, such as insufficient working clearance, excessive working clearance, changes in working clearance due to temperature, damage to the contact area, contamination, inappropriate lubricants or The raceway is damaged.
The noise emitted by the bearing may be caused by a combination of one or more factors, such as insufficient working clearance, excessive working clearance, changes in working clearance due to temperature, damage to the contact area, contamination, inappropriate lubricants or The raceway is damaged.