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NJ300 Series


Cylindrical roller bearings provide the highest possible radial load capacity compared to other roller bearing types. Four primary styles are available to meet a variety of application requirements.
The rollers of Cylindrical roller bearings are a key component. Their geometry, the so-called logarithmic profile, provides an optimum stress distribution in the contact zones in the bearing. Their surface finish maximizes lubricant film formation and optimizes rolling motion of the rollers. The benefits derived from this compared with traditional designs include enhanced operational reliability and a greater insensitivity to misalignment.
One-row, or single-row, caged Cylindrical roller bearings are available in six primary designs. Inside and outside ring configurations vary to accommodate different application designs.
Two-row, or double-row, Cylindrical roller bearings offer added radial capacity over traditional one-row types.
Four-row Cylindrical roller bearings have an extremely high radial load capacity, but no thrust capacity. This bearing type is mostly used in roll neck and work roll applications in the metal rolling industry.
Full complement Cylindrical roller bearings meet the need for increased radial load carrying capacity by maximizing the number of rollers in a given envelope.
WGD Bearing No.
Boundary dimensions
Basic load rating(kN)
Limiting speeds
Mass
mm
Dynamic
Static
rpm
Kg
d
D
B
rs min
rs1 min
Cr
Cor
Grease
Oil
≈
NJ304E
20
52
15
1.1
0.6
31.5
26.9
13,000
15,000
0.176
NJ305E
25
62
17
1.1
1.1
41.5
37.5
11,000
13,000
0.275
NJ306E
30
72
19
1.1
1.1
53
50
9,300
11,000
0.398
NJ307E
35
80
21
1.5
1.1
71
71
8,100
9,600
0.545
NJ308
40
90
23
1.5
1.5
58.5
57
8,000
9,400
0.658
NJ308E
40
90
23
1.5
1.5
83
81.5
7,200
8,500
0.754
NJ309
45
100
25
1.5
1.5
74
71
7,200
8,400
0.877
NJ309E
45
100
25
1.5
1.5
97.5
98.5
6,500
7,600
0.996
NJ310
50
110
27
2
2
87
86
6,500
7,700
1.14
NJ310E
50
110
27
2
2
110
113
5,900
6,900
1.3
NJ311
55
120
29
2
2
111
111
5,900
7,000
1.45
NJ311E
55
120
29
2
2
137
143
5,300
6,300
1.65
NJ312
60
130
31
2.1
2.1
124
126
5,500
6,500
1.8
NJ312E
60
130
31
2.1
2.1
150
157
4,900
5,800
2.05
NJ313
65
140
33
2.1
2.1
135
139
5,100
6,000
2.23
NJ313E
65
140
33
2.1
2.1
181
191
4,600
5,400
2.54
NJ314
70
150
35
2.1
2.1
158
168
4,700
5,500
2.71
NJ314E
70
150
35
2.1
2.1
205
222
4,200
5,000
3.1
NJ315
75
160
37
2.1
2.1
190
205
4,400
5,200
3.28
NJ315E
75
160
37
2.1
2.1
240
263
4,000
4,700
3.74
NJ316
80
170
39
2.1
2.1
190
207
4,100
4,800
3.86
NJ316E
80
170
39
2.1
2.1
256
282
3,700
4,400
4.22
NJ317
85
180
41
3
3
212
228
3,900
4,600
4.54
NJ317E
85
180
41
3
3
291
330
3,500
4,100
4.81
NJ318
90
190
43
3
3
240
265
3,700
4,300
5.3
NJ318E
90
190
43
3
3
315
355
3,300
3,900
5.72
NJ319
95
200
45
3
3
259
285
3,400
4,000
6.13
NJ319E
95
200
45
3
3
335
385
3,100
3,600
6.62
NJ320
100
215
47
3
3
299
335
3,300
3,800
7.49
NJ320E
100
215
47
3
3
380
425
2,900
3,500
8.57
NJ321
105
225
49
3
3
320
360
3,100
3,700
8.53
NJ322
110
240
50
3
3
360
400
3,000
3,500
10
NJ322E
110
240
50
3
3
450
525
2,700
3,100
11.1
NJ324
120
260
55
3
3
450
510
2,700
3,200
12.8
NJ324E
120
260
55
3
3
530
610
2,400
2,800
13.9
NJ326
130
280
58
4
4
560
665
2,500
2,900
17.4
NJ326E
130
280
58
4
4
615
735
2,200
2,600
19.4
NJ328
140
300
62
4
4
615
745
2,300
2,700
21.2
NJ328E
140
300
62
4
4
665
795
2,100
2,400
23.2
NJ330
150
320
65
4
4
665
805
2,100
2,500
25.3
NJ330E
150
320
65
4
4
760
920
1,900
2,300
28.4

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