Single row cylindrical roller bearings are designed primarily to carry radial loads. Their cylindrical rollers provide a larger contact area than point-contact rolling elements, making this bearing structure suitable for applications where radial load capacity and rigidity are important.
The NU series supplied by BMT covers a wide range of sizes, from NU 2204 with a 20 mm bore to NU 2276 with a 300 mm bore. The specifications also provide dynamic and static radial load ratings, grease and oil limiting speeds, dimensions, and bearing weight for each model. This allows engineers to evaluate the bearing according to actual shaft dimensions, housing space, load requirements, and operating speed.
For industrial equipment, the bearing should not be selected by bore diameter alone. Radial load, rotational speed, lubrication method, shaft and housing fits, operating temperature, and installation conditions all influence the final specification. BMT supports customers with both standard bearing selection and customized requirements for OEM applications.
|
Bearing Model |
d (mm) |
d1 (mm) |
D (mm) |
H (mm) |
Cr Dynamic Radial (kN) |
C0r Static Radial (kN) |
Limiting Speed Grease (rpm) |
Limiting Speed Oil (rpm) |
Weight (kg) |
|
NU 2204 |
20 |
28 |
47 |
18 |
19 |
19.5 |
14,000 |
17,000 |
0.12 |
|
NU 2205 |
25 |
34 |
52 |
18 |
23 |
25.5 |
12,000 |
15,000 |
0.14 |
|
NU 2206 |
30 |
39 |
62 |
20 |
28 |
31.5 |
11,000 |
13,000 |
0.20 |
|
NU 2207 |
35 |
45 |
72 |
23 |
35 |
39.5 |
10,000 |
12,000 |
0.28 |
|
NU 2208 |
40 |
51 |
80 |
23 |
41 |
46.5 |
9,500 |
11,000 |
0.34 |
|
NU 2209 |
45 |
56 |
85 |
23 |
47 |
54 |
8,500 |
10,000 |
0.39 |
|
NU 2210 |
50 |
62 |
90 |
23 |
53 |
61 |
8,000 |
9,500 |
0.44 |
|
NU 2212 |
60 |
75 |
110 |
28 |
70 |
82 |
6,700 |
8,000 |
0.65 |
|
NU 2214 |
70 |
87 |
125 |
31 |
88 |
103 |
5,600 |
7,000 |
0.88 |
|
NU 2216 |
80 |
98 |
145 |
33 |
109 |
127 |
4,800 |
6,000 |
1.10 |
|
NU 2218 |
90 |
110 |
160 |
36 |
128 |
150 |
4,300 |
5,300 |
1.35 |
|
NU 2220 |
100 |
122 |
180 |
40 |
156 |
185 |
3,800 |
4,800 |
1.75 |
|
NU 2222 |
110 |
134 |
200 |
44 |
185 |
220 |
3,400 |
4,300 |
2.20 |
|
NU 2224 |
120 |
146 |
215 |
46 |
210 |
250 |
3,000 |
3,800 |
2.60 |
|
NU 2230 |
130 |
160 |
230 |
48 |
235 |
280 |
2,700 |
3,400 |
3.00 |
|
NU 2232 |
140 |
172 |
250 |
50 |
260 |
310 |
2,400 |
3,000 |
3.50 |
|
NU 2234 |
150 |
184 |
270 |
52 |
285 |
340 |
2,100 |
2,700 |
4.00 |
|
NU 2236 |
160 |
196 |
290 |
54 |
310 |
370 |
1,900 |
2,400 |
4.40 |
|
NU 2238 |
170 |
208 |
310 |
56 |
335 |
400 |
1,700 |
2,100 |
4.80 |
|
NU 2240 |
180 |
220 |
330 |
58 |
360 |
430 |
1,500 |
1,900 |
5.20 |
|
NU 2244 |
190 |
232 |
350 |
60 |
385 |
460 |
1,300 |
1,700 |
5.60 |
|
NU 2248 |
200 |
244 |
370 |
62 |
410 |
490 |
1,200 |
1,600 |
6.00 |
|
NU 2250 |
210 |
256 |
390 |
64 |
440 |
520 |
1,100 |
1,500 |
6.40 |
|
NU 2252 |
220 |
268 |
410 |
66 |
470 |
550 |
1,000 |
1,400 |
6.80 |
|
NU 2254 |
230 |
280 |
430 |
68 |
500 |
580 |
900 |
1,300 |
7.20 |
|
NU 2256 |
240 |
292 |
450 |
70 |
530 |
610 |
850 |
1,200 |
7.50 |
|
NU 2258 |
250 |
304 |
470 |
72 |
560 |
640 |
800 |
1,100 |
7.80 |
|
NU 2260 |
260 |
316 |
490 |
74 |
590 |
670 |
750 |
1,050 |
8.10 |
|
NU 2264 |
270 |
328 |
510 |
76 |
620 |
700 |
700 |
1,000 |
8.30 |
|
NU 2268 |
280 |
340 |
530 |
78 |
650 |
730 |
650 |
950 |
8.60 |
|
NU 2272 |
290 |
352 |
550 |
80 |
680 |
760 |
600 |
900 |
8.90 |
|
NU 2276 |
300 |
364 |
570 |
82 |
710 |
790 |
550 |
850 |
9.20 |
The cylindrical roller structure provides line contact between the rolling elements and raceways, giving the bearing a substantial radial load-carrying area. This makes NU series bearings suitable for shafts and rotating assemblies subjected primarily to radial forces.
The supplied models cover a broad load range, from 19 kN dynamic radial load rating for NU 2204 to 710 kN for NU 2276. Engineers can therefore select a model according to the required capacity instead of applying one generic load value to the entire product family.
The roller and raceway surfaces directly affect friction, heat generation, and running stability. BMT applies precision grinding and finishing processes to bearing components to control surface quality and running characteristics.
The available models have different grease and oil limiting speeds, with smaller models supporting substantially higher rotational speeds than larger models. For example, NU 2204 is listed at 14,000 rpm with grease and 17,000 rpm with oil, while NU 2276 is listed at 550 rpm with grease and 850 rpm with oil.
Industrial machinery often operates for extended periods without frequent shutdowns. Bearing performance therefore depends on maintaining suitable lubrication, load, temperature, alignment, and operating speed throughout the working cycle.
BMT's cylindrical roller bearings are designed for industrial applications where continuous radial loading is a primary requirement. The actual service life depends on the complete operating conditions and should be evaluated using the selected bearing model and application parameters.
The listed NU series covers bore sizes from 20 mm to 300 mm. This range provides options for compact shafts as well as large industrial rotating assemblies.
Bore size is the starting point for model selection, but it should always be checked together with outside diameter and bearing width to ensure that the bearing fits the housing and available installation space.
The technical table provides Cr as the dynamic radial basic load rating and C0r as the static radial basic load rating. These values are different for each model and should be compared with the radial loads generated by the machine.
Selecting the largest bearing available is not necessarily the best engineering solution. The target should be a bearing with suitable load capacity, speed capability, installation dimensions, and operating characteristics for the actual application.
The published specifications provide separate limiting speeds for grease and oil lubrication. Lubrication method affects heat removal and permissible operating speed, so the relevant value should be used when evaluating the bearing for a particular machine.
For continuous high-speed machinery, lubrication quantity, lubricant type, operating temperature, sealing arrangement, and maintenance interval should be considered together.
Electric motors and transmission systems require stable radial shaft support while operating at defined rotational speeds. The NU series offers a broad range of dimensions and load capacities for equipment designers working with different shaft sizes and load conditions.
Conveyors can place continuous radial loads on rotating shafts and may experience frequent starts and stops. Cylindrical roller bearings can be selected where high radial load capacity is required and the bearing speed remains within the specified limit for the model.
Textile machinery often combines continuous operation with relatively high rotational speeds. Smaller NU series models provide higher limiting-speed values and can be considered for machinery requiring compact radial bearing support.
Machine tools and industrial automation systems place particular demands on bearing geometry, installation accuracy, lubrication, vibration, and running stability. The appropriate model should be selected according to the complete spindle or shaft-support arrangement rather than bearing size alone.
Large gearboxes and heavy machinery can generate substantial radial forces. The larger NU series models provide dynamic radial load ratings up to 710 kN in the supplied specifications, making them suitable for applications where high radial capacity is a key design requirement.
BMT Bearings was established in 2004 in Yuyao, Ningbo, China. The company has developed from its original bearing manufacturing operation into a producer and exporter of ball and roller bearings for industrial and OEM customers.
In 2005, BMT began developing non-standard bearings. Annual bearing production subsequently reached more than 20 million pieces in 2007, 30 million in 2008, 50 million in 2012, and approximately 100 million pieces in 2024.
BMT operates approximately 100 automatic grinding production lines together with automatic assembly lines. The production system is supported by measuring and testing equipment used to monitor bearing dimensions and manufacturing quality.
The company has an annual production capacity of approximately 100 million bearing sets, providing capacity for standard product production, OEM programs, and recurring industrial orders.
BMT has been assessed and registered under ISO9001 and IATF 16949:2016 quality management systems. Standardized processes cover production, inspection, assembly, and final product verification.
For customers requiring consistent running characteristics, BMT also applies EMQ quality standards on selected production lines.
Bearing selection should begin with the actual operating data rather than the bearing name alone. BMT can review shaft diameter, housing dimensions, radial load, speed, lubrication method, operating temperature, and installation conditions to identify an appropriate NU series model.
This is especially useful when replacing an existing bearing, because the original bearing designation can be compared with the new application's current load and speed requirements.
Different machines may require different internal clearance and fit conditions because of temperature, shaft tolerance, housing design, or operating speed. For OEM projects, BMT can discuss the required specification according to customer drawings and technical requirements.
BMT also has experience in non-standard bearing development, allowing projects with dimensions or requirements outside standard catalog models to be evaluated separately.
Grinding accuracy has a direct influence on raceway geometry, roller contact, and running characteristics. BMT uses automated grinding production lines to maintain consistent processing across large production volumes.
Automated assembly is combined with measurement and testing procedures to control the finished bearing. Inspection requirements can cover dimensions, running characteristics, noise, vibration, hardness, and other parameters specified for the relevant product or OEM project.
For bearing distributors and equipment manufacturers, repeat-order consistency is an important purchasing consideration. BMT's standardized manufacturing procedures and automated production equipment are intended to maintain consistent bearing specifications between production batches.
Before installation, the shaft, housing, and bearing seating surfaces should be clean and free from contamination or damage. Correct fitting methods should be used to avoid transferring excessive force through the rolling elements.
The bearing should be installed according to the machine manufacturer's fitting requirements and the selected bearing's dimensional and clearance specifications.
Lubrication requirements depend on the bearing speed, load, temperature, operating environment, and selected lubricant. The original maintenance instruction of the equipment should take priority when determining the relubrication interval.
For continuous operation, regular checks of lubricant condition, bearing temperature, noise, and vibration can help identify developing problems before they result in unplanned equipment shutdown.
A sudden increase in bearing temperature, abnormal vibration, or unusual noise can indicate lubrication problems, excessive load, installation issues, or bearing wear. Routine monitoring provides useful information for preventive maintenance and replacement planning.
BMT has received application feedback from customers using cylindrical roller bearings in industrial machinery, including conveyor, woodworking, textile, and continuous-production equipment.
In one food-processing application, the reported bearing replacement period increased from 8 months to 14 months after switching to BMT bearings, while the customer reported approximately 35% less machine downtime and annual maintenance savings of more than RMB 200,000.
In a logistics conveyor application using an N310 model, the customer reported a 25% increase in system uptime. In woodworking machinery, application feedback also indicated approximately 12% lower energy consumption.
These figures are customer-reported application results rather than universal performance guarantees. Actual bearing life, energy consumption, uptime, and maintenance cost depend on machine design, load, speed, lubrication, installation, environment, and maintenance practices.
Internal clearance can be adjusted for application conditions where standard clearance is not suitable. BMT can review operating temperature, shaft and housing fits, speed, and load conditions when determining the appropriate requirement.
OEM customers can provide drawings, samples, existing bearing numbers, or application data for evaluation. BMT can discuss dimensions, internal specifications, lubrication, sealing, tolerance, and other requirements according to the project.
BMT's annual production capacity of approximately 100 million bearing sets supports high-volume procurement, repeat orders, and distributor supply. Production and delivery requirements can be coordinated according to the required model and order quantity.
BMT has been manufacturing bearings since 2004 and has developed capabilities covering ball bearings, roller bearings, and non-standard bearing requirements. Its production system includes approximately 100 automatic grinding production lines, automatic assembly equipment, and measurement and testing systems.
The NU series provides a broad selection of cylindrical roller bearings, from compact 20 mm bore models to 300 mm bore models, with dynamic radial load ratings extending to 710 kN in the supplied specifications.
For OEM manufacturers, distributors, and industrial equipment buyers, BMT provides more than a catalog bearing. The company can support model selection, application evaluation, customized requirements, and recurring supply based on actual equipment needs.
They are primarily used for radial load support in rotating machinery. Typical applications include electric motors, gearboxes, conveyors, textile machinery, machine tools, woodworking equipment, industrial automation, and heavy industrial machinery.
The supplied models have dynamic radial basic load ratings from 19 kN for NU 2204 to 710 kN for NU 2276. The correct value depends on the exact bearing model.
Cr is the dynamic radial basic load rating, while C0r is the static radial basic load rating. Both values are listed by model and should be considered when evaluating the bearing against the machine's actual radial loading conditions.
The supplied NU series covers bore sizes from 20 mm to 300 mm. Outside diameter and bearing width vary according to the specific model.
Some smaller NU models have relatively high limiting speeds. NU 2204, for example, is listed at 14,000 rpm with grease lubrication and 17,000 rpm with oil lubrication. Maximum speed decreases as bearing size increases, so the exact model must be checked.
Yes. The supplied technical table provides a grease limiting speed for every listed model. Lubricant selection and quantity should still be determined according to the operating speed, load, temperature, and equipment manufacturer's maintenance requirements.
Yes. The technical table includes oil limiting speeds for the listed NU models. The appropriate lubrication method should be selected according to the machine's speed, load, temperature, and operating environment.
Yes. BMT began non-standard bearing development in 2005 and can evaluate customized requirements based on customer drawings, samples, dimensions, and application conditions.
Yes. Internal clearance can be discussed according to operating temperature, shaft and housing fits, rotational speed, load, and other application conditions.
BMT has been assessed and registered under ISO9001 and IATF 16949:2016 quality management systems. The manufacturing system includes automated grinding, automatic assembly, measurement, and testing equipment.
BMT's annual bearing production capacity is approximately 100 million sets. The company operates approximately 100 automatic grinding production lines together with automatic assembly lines.
Yes. BMT supports recurring orders, OEM production, distributor supply, and industrial bulk purchasing. Order quantities, production schedules, packaging, and delivery requirements can be discussed according to the project.
The most useful information includes shaft diameter, housing dimensions, radial load, operating speed, lubrication method, operating temperature, installation arrangement, and required bearing clearance. An existing bearing model or technical drawing is also useful.
No. The reported results, such as extended replacement intervals, lower downtime, increased uptime, or energy savings, are application-specific customer feedback. They should not be treated as guaranteed performance for every installation because bearing results depend on the complete machine and operating conditions.
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